pdf-to-markdown/examples/Tragedy-Of-The-Commons.md
Johannes Zillmann 78db114632 Add Markdown comparison tests
- Convert the `example PDFs` with the old `pdf-to-markdown` and write them to text files
- Compare the text files with the conversion of the current code
- Next:
  - Improve the current code to match good conversions of the old code
  - Adapt the text files in case the current conversion is better than the old
- Current tests are breaking
2024-04-21 09:15:46 -06:00

2251 lines
43 KiB
Markdown

### WhatShanlWeMam?
# The Tragedy of the Commons
## Thepopulationproblemhasnotechnicalsolution;
## itrequiresafundamentalextensioninmorality.
#### GarrettHardin
##### Attheendofathoughtfularticleon
##### thefutureofnuclearwar,Wiesnerand
##### York(1)concludedthat:"Bothsidesin
#### thearmsraceare...confrontedbythe
##### dilemmaofsteadilyincreasingmilitary
##### powerandsteadilydecreasingnational
##### security. It is our considered profes-
##### sionaljudgmentthat thisdilemmahas
##### notechnicalsolution.Ifthegreatpow-
##### ers continue to look for solutions in
##### theareaofscienceandtechnologyonly,
##### theresultwillbetoworsenthesitua-
##### tion."
##### Iwouldliketofocusyourattention
##### noton the subjectofthe article (na-
##### tionalsecurityinanuclearworld)but
##### onthekindofconclusiontheyreached,
##### namelythatthereisnotechnicalsolu-
##### tion tothe problem. Animplicit and
##### almostuniversalassumption ofdiscus-
##### sions published in professional and
##### semipopular scientific journals is that
##### the problem under discussion has a
##### technicalsolution.Atechnicalsolution
##### maybedefinedasonethatrequiresa
##### changeonlyin.the techniques of the
##### natural sciences, demanding little or
##### nothinginthewayofchangeinhuman
##### valuesorideasofmorality.
##### In our day (though not in earlier
##### times) technical solutions are always
##### welcome. Becauseofpreviousfailures
##### inprophecy,ittakescourage toassert
##### thata desiredtechnicalsolutionisnot
##### possible. Wiesner and York exhibited
##### this courage; publishing in a science
##### journal, theyinsistedthatthesolution
##### totheproblemwasnottobefoundin
##### the natural sciences. They cautiously
##### qualified their statement with the
##### phrase, "It is our considered profes-
Theauthorisprofessorofbiology,University
of California, Santa Barbara. This article is
basedonapresidentialaddresspresentedbefore
themeetingofthePacificDivisionoftheAmeri-
canAssociationfortheAdvancementofScience
atUtahStateUniversity,Logan, 25 June1968.
```
13 DECEMBER 1968
```
##### sional judgment.. .." Vhether they
##### wererightornotisnottheconcernof
##### thepresentarticle.Rather,theconcern
##### hereiswiththeimportantconceptofa
##### classofhumanproblemswhichcanbe
#### called"notechnicalsolutionproblems,"
##### and,morespecifically,withtheidentifi-
##### cationanddiscussionofone ofthese.
```
Itiseasytoshowthattheclassisnot
a null class.Recall thegameoftick-
```
##### tack-toe. Considertheproblem, "How
##### canIwin.the gameoftick-tack-toe?"
```
ItiswellknownthatIcannot,ifIas-
```
##### sume(inkeepingwiththeconventions
```
ofgametheory)thatmyopponentun-
```
##### derstandsthegame perfectly.Put an-
```
otherway,thereisno"technicalsolu-
```
##### tion" totheproblem. Icanwinonly
##### bygivingaradicalmeaningtotheword
```
"win."Icanhitmyopponentoverthe
```
##### head;orIcandrughim;orIcanfalsify
##### therecords.EverywayinwhichI"win"
##### involves, in somesense, an abandon-
##### mentofthegame,asweintuitivelyun-
##### derstand it. (I can also, of course,
##### openly abandon the game-refuse to
##### playit.Thisiswhatmostadultsdo.)
```
Theclassof"Notechnicalsolution
```
##### problems" hasmembers. Mythesis is
##### thatthe"populationproblem,"ascon-
##### ventionallyconceived,isamemberof
##### thisclass.Howitisconventionallycon-
##### ceivedneedssomecomment. Itisfair
##### tosay thatmost people who'anguish
##### overthepopulationproblemaretrying
```
tofindawaytoavoidtheevilsofover-
```
##### populationwithoutrelinquishinganyof
##### the privileges they now enjoy. They
##### thinkthatfarmingtheseasordevelop-
##### ingnewstrainsofwheatwillsolvethe
#### problem-technologically.Itrytoshow
##### herethatthesolutiontheyseekcannot
##### befound.Thepopulationproblemcan-
##### notbesolvedin atechnicalway, any
##### morethancantheproblemofwinning
##### thegameoftick-tack-toe.
### Population,asMalthussaid,naturally
#### tendstogrow"geometrically,"or,aswe
#### would now say, exponentially. In a
##### finite world this means that the per
### capitashareoftheworld'sgoodsmust
### steadilydecrease.Isoursafiniteworld?
#### Afairdefensecanbeputforwardfor
##### theviewthatthe worldis infinite; or
##### thatwedonotknowthatitisnot.But,
#### intermsofthepracticalproblemsthat
##### wemustfaceinthenextfewgenera-
#### tionswiththeforeseeabletechnology,it
### is clear thatwe will greatly increase
### humanmiseryifwedonot,duringthe
#### immediatefuture,assumethattheworld
##### availabletotheterrestrialhumanpop-
### ulationis finite. "Space" isno escape
###### (2).
#### A finite world can support only a
### finite population;therefore, population
### growthmusteventuallyequalzero.(The
#### case of perpetual wide fluctuations
```
aboveandbelowzeroisatrivialvariant
```
#### thatneednotbediscussed.)Whenthis
##### conditionismet,whatwillbethesitua-
#### tionofmankind?Specifically,canBen-
### tham's goalof"thegreatestgoodfor
##### the greatestnumber"be realized?
##### No-fortworeasons,eachsufficient
#### byitself. Thefirstisatheoreticalone.
#### It is not mathematically possible to
#### maximizefortwo(ormore)variablesat
#### thesametime.Thiswasclearlystated
#### byvonNeumannandMorgenstern(3),
### buttheprincipleisimplicitinthetheory
### ofpartial differentialequations,dating
### back at least to D'Alembert (1717-
#### 1783).
### The second reason springs directly
#### from biological facts. To live, any
#### organismmusthaveasourceofenergy
#### (for example, food). This energy is
##### utilized fortwopuposes: meremain-
##### tenance and work. For man, mainte-
nanceofliferequiresabout (^1600) kilo-
### caloriesaday("maintenancecalories').
#### Anythingthathedoesoverandabove
#### merelystayingalivewill bedefinedas
#### work,andissupportedby"workcal-
##### ories"whichhetakesin.Workcalories
#### areusednotonlyforwhatwecallwork
#### incommon speech; they arealsore-
#### quiredforallformsofenjoyment,from
##### swimming and automobile racing to
##### playing music and writing poetry. If
#### ourgoalistomaximizepopulationitis
##### obvious what we must do: We must
##### maketheworkcaloriesperpersonap-
#### proachasclosetozeroaspossible.No
##### gourmetmeals,novacations,nosports,
#### nomusic,noliterature, noart.. .. I
#### thinkthateveryonewillgrant,without
```
1243
```
```
on March 12, 2021^
```
```
http://science.sciencemag.org/
```
```
Downloaded from
```
```
argument or proof, that maximizing
```
##### population does not max2imize goods.
##### Bentham'sgoalisimpossible.
##### In reaching this conclusion I have
##### madethe usualassumption that it is
##### the acquisition of energy that is the
```
problem. The appearance of atomic
energyhas led someto questionthis
assumption.However,givenaninfinite
source of energy, population growth
```
##### stillproducesaninescapable problem.
##### Theproblemofthe acquisitionofen-
```
ergyisreplacedbytheproblemofits
```
##### dissipation,asJ.H.Fremlinhassowit-
##### tilyshown(4).Thearithmeticsignsin
##### -t-heanalysis are,as itwere, reversed;
##### butBentham'sgoalisstillunobtainable.
```
Theoptimumpopulationis,then,less
```
##### than the maximum. The difficulty of
##### definingtheoptimum isenormous;so
##### far asI know, no one has seriously
##### tackledthisproblem. Reaching anac-
##### ceptableandstablesolutionwillsurely
##### require more than one generation of
##### hardanalyticalwork-and muchper-
##### suasion.
##### We want the maximum good per
##### person;butwhatisgood?Tooneper-
##### sonitiswilderness,toanotheritisski
#### lodgesforthousands.Tooneitisestu-
##### aries tonourish ducks forhunters to
##### shoot; to another it is factory land.
##### Comparingonegood withanother is,
##### we usually say, impossible because
##### goodsareincommensurable.Incommen-
##### surablescannotbecompared.
##### Theoreticallythismaybetrue;butin
##### reallifeincommensurablesarecommen-
#### surable. Onlyacriterion ofjudgment
##### andasystemofweightingareneeded.
##### Innaturethecriterionissurvival.Isit
##### betterforaspeciestobesmallandhide-
##### able, orlarge and powerful? Natural
##### selectioncommensuratestheincommen-
##### surables.Thecompromiseachievedde-
##### pends on a natural weighting of the
##### valuesofthevariables.
##### Manmustimitatethisprocess.There
##### isnodoubtthatinfacthealreadydoes,
##### butunconsciously.Itiswhenthehidden
##### decisions are made explicit that the
##### argumentsbegin. Theproblem forthe
```
yearsaheadistoworkoutanaccept-
```
#### able theory of weighting. Synergistic
##### effects,nonlinearvariation,anddifficul-
##### tiesindiscountingthefuturemakethe
#### intellectual problem difficult, but not
##### (inprinciple)insoluble.
##### Has any cultural group solved this
##### practical problem at thepresenttime,
#### evenonanintuitivelevel?Onesimple
##### factprovesthat nonehas: thereisno
##### prosperouspopulationintheworldto-
##### day that has, and has had for some
```
1244
```
```
time,-p -rateofzero.Anypeople
```
##### that has intuitively identified itsopti-
##### mum point will soon reach it, after
##### whichitsgrowthratebecomesandre-
```
mainszero.
```
##### Of course, a positive growth rate
##### mightbetakenasevidencethatapop-
##### ulationisbelowitsoptimum.However,
##### byany reasonablestandards,themost
##### rapidly growing populations on earth
```
todayare(ingeneral)themostmisera-
```
##### ble.Thisassociation(whichneednotbe
##### invariable)castsdoubtontheoptimistic
```
assumptionthatthepositivegrowthrate
```
##### ofapopulationisevidencethatithas
```
yettoreachitsoptimum.
```
##### Wecanmakelittleprogressinwork-
##### ingtowardoptimumpoulationsizeuntil
```
we explicitly exorcize the spirit of
```
##### Adam Smith inthe field ofpractical
##### demography.Ineconomic affairs, The
##### WealthofNations (1776) popularized
##### the "invisible hand,"the idea thatan
```
individual who "intendsonly hisown
```
##### gain,"is,asitwere,"ledbyaninvisible
```
handtopromote..,.thepublicinterest"
```
##### (5). Adam Smith did not assert that
##### this was invariablytrue, and perhaps
##### neitherdidanyofhisfollowers.Buthe
##### contributedtoadominanttendencyof
##### thoughtthat has eversinceinterfered
##### with positive action basedonrational
##### analysis, namely, the tendency to as-
##### sumethatdecisionsreachedindividually
##### will,infact,bethebestdecisionsforan
##### entire society. If this assumption is
##### correct it justifies the continuance of
##### our presentpolicy of laissez-faire in
##### reproduction.Ifitiscorrectwecanas-
```
sumethatmenwillcontroltheirindivid-
```
##### ualfecunditysoastoproducetheopti-
##### mumpopulation. If theassumption is
##### notcorrect,weneedtoreexamineour
```
individualfreedoms toseewhichones
aredefensible.
```
##### TragedyofFreedominaCommons
```
Therebuttaltotheinvisiblehandin
```
##### populationcontrolistobefoundina
##### scenariofirstsketchedinalittle-known
##### pamphlet(6)in 1833 byamathematical
#### amateurnamedWilliamForsterLloyd
##### (1794-1852).Wemaywellcallit"the
#### tragedy of the commons," using the
#### word "tragedy" as the philosopher
##### Whiteheadusedit(7):"Theessenceof
#### dramatictragedyisnotunhappiness.It
#### residesinthesolemnityoftheremorse-
#### lessworkingofthings."Hethen'goeson.
### tosay, "Thisinevitableness ofdestiny
##### canonlybeillustratedintermsofhu-
##### manlifebyincidentswhichinfactin-
##### volve unhappiness.For it is onlyby
##### themthatthefutilityofescapecanbe
##### madeevidentinthedrama."
##### Thetragedyofthecommonsdevelops
##### inthisway. Pictureapastureopento
##### all.Itistobeexpectedthateachherds-
##### manwilltrytokeepasmanycattleas
##### possibleonthecommons.Suchanar-
```
rangementmayworkreasonablysatis-
```
##### factorily for centuries because tribal
##### wars, poaching, and disease keep the
##### numbers ofbothman andbeast well
##### belowthecarryingcapacityoftheland.
##### Finally, however, comes the day of
##### reckoning, that is, the day when the
##### long-desiredgoalofsocialstabilitybe-
```
comesareality. Atthispoint,thein-
```
##### herentlogicofthecommonsremorse-
##### lesslygeneratestragedy.
##### Asa rationalbeing,eachherdsman
##### seekstomaximizehis gain.Explicitly
##### orimplicitly,moreorlessconsciously,
##### heasks,"Whatistheutilitytomeof
```
addingonemoreanimaltomyherd?"
```
##### Thisutilityhas onenegative andone
##### positivecomponent.
```
1)Thepositivecomponentisafunc-
```
##### tionofthe increment ofone animal.
##### Since the herdsman receives all the
##### proceedsfromthesaleoftheadditional
##### animal,thepositiveutilityisnearly+1.
##### 2) Thenegativecomponentisafunc-
##### tion of the additional overgrazing
##### created by one more animal. Since,
##### however,theeffectsofovergrazingare
##### sharedbyalltheherdsmen,thenegative
##### utility for any particular decision-
##### makingherdsmanisonlyafractionof
##### -1.
##### Addingtogetherthecomponentpar-
##### tial utilities, the rational herdsman
##### concludesthattheonlysensiblecourse
```
forhim topursue is to add another
```
##### animaltohis herd.And another;and
##### another....Butthisistheconclusion
##### reached by each and every rational
##### herdsmansharingacommons.Therein
##### isthetragedy.Eachmanislockedinto
##### asystemthatcompelshimtoincrease
##### hisherdwithoutlimit-inaworldthat
##### islimited. Ruin isthe destination to-
##### wardwhichallmenrush,eachpursuing
##### hisownbestinterest ina societythat
```
believes in the freedom of the com-
```
#### mons. Freedomina commons brings
##### ruintoall.
#### Somewouldsaythatthisisaplati-
##### tude.Wouldthatitwere!Inasense,it
##### waslearnedthousandsofyearsago,but
##### natural selectionfavors the forces of
#### psychologicaldenial(8).Theindividual
#### benefitsasanindividualfromhisability
#### todenythetrutheventhoughsocietyas
##### awhole,ofwhichheisapart,suffers.
```
SCIENCE,VOL. 162
```
```
on March 12, 2021^
```
```
http://science.sciencemag.org/
```
```
Downloaded from
```
```
Education can counteract the natural
```
##### tendencytodothewrongthing,butthe
##### inexorable succession of generations
##### requiresthatthebasisforthisknowl-
##### edgebeconstantlyrefreshed.
##### Asimpleincidentthatoccurredafew
##### yearsagoinLeominster,Massachusetts,
##### showshowperishabletheknowledgeis.
##### Duringthe Christmasshoppingseason
##### the parking meters downtown were
##### coveredwithplasticbagsthatboretags
##### reading:"DonotopenuntilafterChrist-
##### mas. Free parking courtesy of the
##### mayorandcitycouncil."Inotherwords,
##### facingtheprospectofanincreasedde-
##### mandforalreadyscarcespace,thecity
##### fathers reinstituted the system of the
##### commons. (Cynically, we suspect that
##### theygainedmorevotesthan theylost
##### bythisretrogressiveact.)
##### Inanapproximateway,thelogicof
##### thecommonshasbeenunderstoodfor
##### a long time, perhaps since the dis-
##### coveryofagricultureorthe invention
##### ofprivateproperty inreal estate. But
##### itisunderstoodmostly onlyinspecial
##### caseswhicharenotsufficientlygeneral-
##### ized.Even atthislate date,cattlemen
##### leasing national land on the western
##### ranges demonstrate no morethan an
##### ambivalentunderstanding,inconstantly
##### pressuringfederalauthoritiestoincrease
##### theheadcounttothepointwhereover-
##### grazing produces erosion and weed-
##### dominance.Likewise,theoceansofthe
##### worldcontinuetosufferfromthe sur-
##### vivalofthephilosophyofthecommons.
##### Maritimenationsstillrespondautomat-
##### icallytotheshibbolethofthe"freedom
##### ofthe seas." Professing tobelieve in
##### the "inexhaustible resources of the
##### oceans,"theybringspeciesafterspecies
##### offishandwhalesclosertoextinction
### (9).
##### TheNationalParkspresentanother
##### instance of the working out of the
##### tragedy ofthe commons.At present,
##### theyareopentoall,withoutlimit.The
##### parksthemselvesarelimitedinextent-
##### there is onlyone Yosemite Valley-
##### whereaspopulationseemstogrowwith-
##### outlimit.Thevaluesthatvisitors seek
##### intheparksaresteadilyeroded.Plainly,
```
wemustsoon ceasetotreattheparks
```
##### ascommonsortheywillbeofnovalue
toanyone.
##### Whatshallwedo?Wehaveseveral
##### options.Wemightsellthemoffaspri-
##### vateproperty.Wemightkeepthemas
##### public property,but allocate theright
#### toenterthem.Theallocationmightbe
##### onthebasisofwealth,bytheuseofan
##### auctionsystem.Itmightbeonthebasis
#### ofmerit, as defined by some agreed-
```
13 DECEMBER 1968
```
##### uponstandards.Itmightbebylottery.
##### Or itmight be on a first-come, first-
##### served basis, administered to long
##### queues. These, I think, are all the
##### reasonable possibilities. They are all
##### objectionable.Butwemustchoose-or
##### acquiesceinthedestructionofthecom-
```
monsthatwecallourNationalParks.
```
```
Pollution
```
##### In a reverse way, the tragedy of
##### thecommonsreappearsinproblemsof
##### pollution.Hereitisnotaquestion of
##### takingsomethingoutofthecommons,
#### but of putting something in-sewage,
##### or chemical, radioactive, and heat
##### wastesintowater;noxiousanddanger-
##### ousfumesintotheair;anddistracting
##### and unpleasant advertising signs into
##### the line of sight. Thecalculations of
##### utility are much the same as before.
```
Therationalmanfindsthathisshareof
```
##### thecostofthewasteshedischargesinto
```
the commons islessthan the costof
```
##### purifying his wastes before releasing
```
them.Sincethisistrueforeveryone,we
```
##### arelockedintoasystemof"foulingour
##### ownnest," solongaswebehaveonly
##### as independent, rational, free-enter-
```
prisers.
```
##### The tragedyof the commons as a
```
foodbasketisavertedbyprivateprop-
```
##### erty,orsomethingformallylikeit.But
##### theairandwaterssurroundinguscan-
##### notreadilybefenced,andsothetrag-
##### edyofthecommonsasacesspoolmust
##### bepreventedbydifferentmeans,byco-
##### ercivelawsortaxingdevicesthatmake
##### itcheaperforthepollutertotreat his
##### pollutantsthanto discharge themun-
```
treated.Wehavenotprogressedasfar
```
##### withthesolutionofthisproblemaswe
##### havewiththefirst.Indeed,ourparticu-
##### larconceptofprivateproperty,which
##### deters usfrom exhaustingthepositive
##### resourcesoftheearth,favorspollution.
##### Theownerofafactoryonthebankof
##### a stream-whose property extends to
##### the middle of the stream-often has
##### difficultyseeingwhyitisnothisnatural
##### righttomuddythewatersflowingpast
##### hisdoor.The law, alwaysbehindthe
##### times,requires elaborate stitchingand
##### fittingtoadaptittothisnewlyperceived
##### aspectofthecommons.
##### The pollution problem is a con-
##### sequenceofpopulation.Itdidnotmuch
##### matterhowalonelyAmericanfrontiers-
##### man disposed ofhis waste. "Flowing
##### waterpurifiesitselfevery 10 miles,"my
##### grandfatherusedtosay,andthemyth
```
wasnearenoughtothetruthwhenhe
```
### wasaboy,fortherewerenottoomany
## people.Butaspopulationbecamedenser,
#### thenaturalchemicalandbiologicalre-
### cycling processes became overloaded,
### calling for a redefinition of property
## rights.
### HowTo LegislateTemperance?
### Analysisofthepollutionproblemas
### a function of population density un-
### coversanotgenerallyrecognizedprin-
## cipleofmorality,namely: themorality
### ofanactisafunctionofthestateof
### thesystematthetimeitisperformed
### (10).Usingthecommonsasacesspool
#### doesnotharmthegeneralpublicunder
#### frontierconditions,becausethereisno
### public;thesamebehaviorinametropo-
#### lisisunbearable.A hundredandfifty
#### years ago a plainsman could kill an
#### Americanbison,cutoutonlythetongue
#### forhisdinner,anddiscardtherestof
### theanimal.Hewasnotin anyimpor-
### tantsensebeingwasteful.Today,with
#### only a few thousand bison left, we
#### wouldbeappalledatsuchbehavior.
#### Inpassing,itisworthnotingthatthe
#### moralityofanactcannotbedetermined
#### fromaphotograph.Onedoesnotknow
#### whether amankilling anelephant or
### settingflretothegrasslandisharming
##### othersuntiloneknowsthetotalsystem
### inwhichhisactappears."Onepicture
#### is worth a thousand words," said an
#### ancientChinese;butitmaytake10,
#### wordstovalidateit.Itisastemptingto
#### ecologistsasitistoreformersingeneral
#### totrytopersuadeothersbywayofthe
#### photographicshortcut.Butthe essense
#### of an argument cannot be photo-
#### graphed:itmustbepresentedrationally
##### -inwords.
#### That morality is system-sensitive
#### escapedtheattentionofmostcodifiers
##### of ethics in the past. "Thou shalt
##### not.. ." is the form of traditional
##### ethicaldirectiveswhichmakenoallow-
#### anceforparticularcircumstances. The
#### lawsofoursocietyfollowthepatternof
#### ancientethics,andthereforearepoorly
#### suitedtogoverningacomplex,crowded,
#### changeable world. Ourepicyclic solu-
##### tion istoaugment statutorylaw with
##### administrativelaw.Sinceitispractically
#### impossibletospelloutalltheconditions
##### underwhichitissafetoburntrashin
##### thebackyardortorunanautomobile
##### withoutsmog-control, bylawwe dele-
##### gatethe detailstobureaus.Theresult
##### isadministrative law, whichis rightly
#### feared for an ancient reason-Quis
##### custodiet ipsos custodes?-"Who shall
```
1245
-A
```
```
on March 12, 2021^
```
```
http://science.sciencemag.org/
```
```
Downloaded from
```
##### watchthe watchersthemselves?" John
##### Adamssaidthatwemusthave"agov-
##### ernmentoflawsandnotmen."Bureau
```
administrators, trying to evaluate the
moralityofactsinthetotalsystem,are
```
##### singularlyliable tocorruption, produc-
##### ingagovernmentbymen,notlaws.
```
Prohibition is easy to legislate
```
##### (thoughnotnecessarilytoenforce);but
##### howdo welegislate temperance? Ex-
##### perience indicates that it can be ac-
complishedbestthrough themediation
ofadministrative law. Welimit possi-
##### bilitiesunnecessarilyifwesupposethat
##### thesentimentof Quiscustodietdenies
us the useofadministrative law. We
should rather retain the phrase as a
perpetual reminder offearful dangers
we cannotavoid. The great challenge
##### facingusnowistoinventthecorrective
##### feedbacksthatareneededtokeepcus-
##### todians honest.We mustfindways to
##### legitimatetheneededauthorityofboth
thecustodiansandthecorrectivefeed-
##### backs.
##### Freedom To Breed Is Intolerable
##### Thetragedyofthe commons isin-
##### volved in population problems inan-
##### otherway. Inaworldgovernedsolely
##### by theprincipleof"dog eatdog"-if
##### indeedthereeverwassuchaworld-
##### howmanychildrenafamilyhadwould
##### not be a matter of public concern.
##### Parentswhobredtooexuberantlywould
##### leavefewerdescendants,notmore,be-
##### cause they would be unable to care
##### adequately for their children. David
##### Lackandothershavefoundthatsucha
##### negative feedback demonstrably con-
##### trols the fecundity ofbirds (11). But
##### menarenotbirds,andhavenotacted
##### likethemformillenniums,atleast.
##### If eachhumanfamily weredepen-
##### dentonlyonitsownresources;ifthe
##### childrenofimprovidentparentsstarved
##### todeath;if,thus,overbreedingbrought
##### itsown"punishment"tothegermline-
##### thentherewouldbenopublic interest
##### incontrollingthebreedingoffamilies.
##### Butoursocietyisdeeplycommittedto
##### thewelfare state (12), and hence is
##### confrontedwithanotheraspectofthe
##### tragedyofthecommons.
##### Inawelfarestate,howshallwedeal
##### withthefamily,thereligion, therace,
#### ortheclass(orindeedanydistinguish-
#### able and cohesive group) that adopts
##### overbreeding asa policyto secureits
#### own aggrandizement (13)? To couple
##### the conceptoffreedomtobreedwith
##### the belief that everyone born has an
```
1246
```
```
equalrighttothecommonsistolock
theworldintoatragiccourseofaction.
Unfortunatelythisisjustthecourse
ofactionthatisbeingpursued bythe
UnitedNations.Inlate1967,some 30
nationsagreedtothefollowing(14):
The Universal Declaration of Human
Rightsdescribesthefamilyasthenatural
and fundamental unit ofsociety. Itfol-
lows that anychoice and decision with
regardtothesizeofthefamilymustirte-
vocably rest with the family itself, and
cannot bemadebyanyoneelse.
Itispainfultohavetodenycategor-
icallythevalidityofthisright;denying
```
##### it,onefeelsasuncomfortableasaresi-
##### dent of Salem, Massachusetts, who
```
deniedtherealityofwitchesinthe17th
century.Atthepresenttime,inliberal
quarters,somethinglikeatabooactsto
```
##### inhibitcriticismoftheUnitedNations.
##### There is a feeling that the United
```
Nations is "our last and best hope,"
```
##### thatweshouldn'tfindfaultwithit;we
##### shouldn't play into the hands of the
```
archconservatives. However,letusnot
```
##### forget what Robert Louis Stevenson
##### said: "Thetruththatissuppressedby
##### friends isthe readiest weapon ofthe
##### enemy."Ifwelovethetruthwemust
##### openlydenythevalidityoftheUniversal
##### Declaration of Human Rights, even
##### thoughit is promoted bythe United
##### Nations. We should also join with
##### Kingsley Davis (15) inattemptingto
##### getPlannedParenthood-WorldPopula-
##### tiontoseetheerrorofitswaysinem-
##### bracingthesametragicideal.
##### ConscienceIsSelf-Eliminating
##### Itisamistaketothinkthatwecan
##### controlthebreedingofmankindinthe
##### long run byan appealtoconscience.
##### CharlesGaltonDarwinmadethispoint
##### whenhespokeonthecentennialofthe
##### publication of his grandfather's great
##### book. The argumentisstraightforward
##### andDarwinian.
##### Peoplevary.Confrontedwithappeals
#### tolimitbreeding,somepeoplewillun-
#### doubtedly respond to the plea more
```
than others. Those who have more
```
##### childrenwillproduce alargerfraction
##### ofthenextgenerationthanthosewith
##### moresusceptibleconsciences. Thedif-
#### ferencewillbeaccentuated, generation
##### bygeneration.
##### InC. G. Darwin'swords: "It may
##### wellbethatitwouldtakehundredsof
#### generationsfortheprogenitive instinct
##### todevelopinthisway,butifitshould
```
do so, nature would have taken her
```
#### revenge,andthevarietyHomocontra-
##### cipiens would become extinct and
##### wouldbereplacedbythevarietyHomo
##### progenitivus" (16).
##### The argument assumes that con-
##### scienceor thedesire forchildren (no
##### matterwhich)ishereditary-butheredi-
##### tary only in the most general formal
```
sense. The result will be the same
```
##### whether the attitude is transmitted
##### throughgerm cells, orexosomatically,
##### touseA.J.Lotka'sterm.(Ifonedenies
```
the latter possibility as well as the
```
##### former,thenwhat'sthepointofeduca-
##### tion?) The argument has here been
##### statedinthecontextofthepopulation
```
problem,butitapplies equallywellto
```
##### any instance in whichsociety appeals
```
toanindividualexploitingacommons
to restrain himself for the general
```
##### good-bymeansofhisconscience.To
##### make such anappeal is to set up a
```
selectivesystemthatworkstowardthe
eliminationofconsciencefromtherace.
```
##### PathogenicEffectsofConscience
##### The long-term disadvantage of an
##### appealtoconscience shouldbeenough
```
tocondemn it; but hasserious short-
```
##### term disadvantagesaswell. Ifwe ask
##### amanwhoisexploitingacommonsto
##### desist "in the name of conscience,"
##### whatarewesayingtohim?Whatdoes
##### hehear?-notonlyatthemomentbut
```
also in the wee small hours of the
```
##### nightwhen, halfasleep,heremembers
```
notmerelythewordsweusedbutalso
the nonverbalcommunication cueswe
gave him unawares? Sooner or later,
```
##### consciouslyorsubconsciously,hesenses
```
thathehas received two communica-
```
##### tions,andthattheyarecontradictory:
##### (i) (intendedcommunication) "Ifyou
##### don'tdoasweask,wewillopenlycon-
##### demnyoufornotactinglikearespon-
##### sible citizen"; (ii) (the unintended
##### communication) "Ifyoudobehaveas
##### weask,wewillsecretlycondemr.you
##### for a simpleton who can be shamed
##### intostandingasidewhiletherestofus
##### exploitthecommons."
##### Everyman then is caught in what
```
Bateson has called a "double bind."
Batesonandhisco-workershavemade
```
##### aplausiblecaseforviewingthedouble
##### bindasanimportantcausativefactorin
##### the genesisofschizophrenia(17).The
##### double bind may not always be so
#### damaging,butitalwaysendangersthe
```
mentalhealthofanyonetowhomitis
```
##### applied. "A bad conscience," said
##### Nietzsche,"isakindofillness."
##### Toconjureupaconscienceinothers
```
SCIENCE,VOL. 162
```
```
on March 12, 2021^
```
```
http://science.sciencemag.org/
```
```
Downloaded from
```
##### istempting toanyonewho wishes to
##### extend his control beyond the legal
#### limits. Leaders at the highest level
##### succumb to this temptation. Hasany
##### President during the past generation
##### failedtocallonlaborunionstomoder-
##### atevoluntarilytheirdemandsforhigher
##### wages,ortosteelcompaniestohonor
##### voluntary guidelines on prices?I can
##### recallnone.Therhetoricusedonsuch
##### occasionsis designedtoproducefeel-
##### ingsofguiltinnoncooperators.
##### Forcenturiesitwasassumedwithout
##### proofthatguiltwasavaluable,perhaps
##### evenanindispensable,ingredientofthe
##### civilizedlife.Now,inthispost-Freudian
```
world,wedoubtit.
Paul Goodman speaks from the
modern point ofview when he says:
```
##### "Nogood hasevercome fromfeeling
##### guilty, neither intelligence,policy, nor
##### compassion. The guilty do not pay
##### attentiontotheobjectbutonlytothem-
##### selves, and noteven totheirown in-
##### terests,whichmightmakesense,butto
##### theiranxieties" (18).
##### Onedoes nothavetobe a profes-
##### sional psychiatrist to see the conse-
##### quencesofanxiety.WeintheWestern
##### worldarejustemergingfromadreadful
##### two-centuries-long DarkAgesofEros
##### that was sustained partly by prohibi-
##### tionlaws,butperhapsmoreeffectively
##### by the anxiety-generating mechanisms
```
ofeducation.AlexComforthastoldthe
```
##### storywellinTheAnxietyMakers(19);
```
itisnotaprettyone.
```
##### Sinceproofisdifficult,wemayeven
##### concedethattheresultsofanxietymay
##### sometimes,fromcertainpointsofview,
##### be desirable. The larger question we
##### should askiswhether, asa matterof
##### policy, we should everencourage the
```
useofatechniquethetendency(ifnot
```
##### the intention) of whichispsycholog-
##### ically pathogenic. Wehearmuchtalk
##### these daysofresponsible parenthood;
##### the coupled words are incorporated
##### intothetitlesofsomeorganizationsde-
```
voted to birth control. Some people
```
##### have proposed massive propaganda
#### campaigns to instillresponsibility into
##### thenation's (ortheworld's) breeders.
##### Butwhat isthemeaning ofthe word
##### responsibilityinthis context?Isitnot
##### merelya synonym for theword con-
##### science? When we use the word re-
```
sponsibilityintheabsenceofsubstantial
```
##### sanctionsarewenottryingtobrowbeat
a freemaninacommonsintoacting
##### againsthisowninterest?Responsibility
##### isaverbalcounterfeitforasubstantial
##### quidproquo. Itisan attempt toget
##### somethingfornothing.
```
13 DECEMBER 1968
```
##### If the word responsibility is to be
##### usedatall,Isuggestthatit beinthe
```
sense Charles Frankel uses it (20).
```
#### "Responsibility," saysthisphilosopher,
##### "is the product of definite social ar-
##### rangements."Notice thatFrankelcalls
##### for social arrangements-not propa-
#### ganda.
```
MutualCoercion
```
##### MutuallyAgreedupon
#### Thesocialarrangementsthatproduce
##### responsibility are arrangements that
##### createcoercion, of somesort. Consid-
##### er bank-robbing. The man whotakes
```
moneyfromabankactsasifthebank
```
##### wereacommons.How doweprevent
##### suchaction?Certainlynotbytryingto
##### controlhisbehaviorsolelybyaverbal
##### appeal to his sense of responsibility.
##### Rather than rely on propaganda we
```
followFrankel'sleadandinsistthata
bank isnot a commons; we seek the
definite social arrangements that will
```
##### keep it from becoming a commons.
##### Thatwetherebyinfringeon thefree-
```
dom of would-be robbers we neither
```
##### denynorregret.
##### The morality of bank-robbing is
##### particularlyeasytounderstandbecause
##### weacceptcompleteprohibitionofthis
##### activity. We arewillingto say"Thou
##### shaltnotrobbanks,"withoutproviding
```
forexceptions.Buttemperancealsocan
```
##### becreatedbycoercion.Taxingisagood
##### coercive device. To keep downtown
##### shoppers temperate in their use of
##### parking space we introduce parking
##### meters for short periods, and traffic
##### fines for longer ones. We need not
##### actuallyforbidacitizentoparkaslong
```
ashewantsto;weneedmerelymakeit
```
##### increasinglyexpensiveforhimtodoso.
##### Not prohibition, but carefully biased
##### optionsarewhatweofferhim.AMadi-
##### son Avenue man might callthisper-
##### suasion;Ipreferthegreatercandorof
```
theword coercion.
```
##### Coercion is a dirty word to most
##### liberalsnow,butitneednotforeverbe
##### so. As withthe four-letter words, its
##### dirtiness canbecleansed awayby ex-
##### posuretothelight,bysayingitoverand
##### overwithoutapologyorembarrassment.
```
To many, the word coercion implies
```
##### arbitrarydecisionsofdistantandirre-
##### sponsiblebureaucrats;butthisisnota
```
necessarypartofitsmeaning.Theonly
```
##### kindofcoercionIrecommendismutual
##### coercion,mutuallyagreeduponbythe
##### majorityofthepeopleaffected.
```
Tosay that we mutually agree to
```
##### coercionisnottosaythatwearere-
#### quiredtoenjoyit,oreventopretend
#### weenjoyit.Whoenjoystaxes?Weall
#### grumble about them. But we accept
### compulsorytaxesbecausewerecognize
### that voluntary taxes would favor the
#### conscienceless.Weinstituteand(grum-
#### blingly)supporttaxesandothercoercive
##### devices to escape the horror of the
```
commons.
```
##### Analternativetothecommonsneed
### notbeperfectlyjust tobe preferable.
```
With real estate and other material
```
#### goods, thealternative wehavechosen
#### is the institution of private property
#### coupled withlegal inheritance. Isthis
### systemperfectlyjust?Asa genetically
### trained biologist I deny that it is. It
#### seemstomethat,iftherearetobedif-
#### ferencesinindividualinheritance,legal
#### possession should be perfectly cor-
#### relatedwithbiologicalinheritance-that
#### thosewhoarebiologicallymorefit to
```
bethecustodiansofpropertyandpower
```
### shouldlegallyinheritmore.Butgenetic
#### recombination continually makes a
#### mockeryofthedoctrineof"likefather,
#### likeson"implicitinourlawsoflegalin-
#### heritance.Anidiotcaninheritmillions,
##### anda trust fund can keephis estate
### intact. We mustadmit thatour legal
#### systemofprivateproperty plusinheri-
#### tanceisunjust-butweputupwithit
#### becausewe are notconvinced, atthe
##### moment, that anyone has invented a
##### better system. The alternative of the
#### commonsistoohorrifyingtocontem-
##### plate. Injustice is preferable to total
```
ruin.
```
##### Itisoneofthe peculiaritiesofthe
##### warfarebetweenreformandthestatus
##### quo that it is thoughtlessly governed
##### byadoublestandard.Wheneverare-
##### formmeasure is proposedit is often
##### defeated when its opponents trium-
#### phantlydiscoveraflawinit.AsKings-
#### leyDavishaspointedout(21),worship-
##### persofthestatusquosometimesimply
##### thatnoreformispossiblewithoutunan-
##### imous agreement, animplication con-
##### trarytohistoricalfact.AsnearlyasI
##### canmake out, automaticrejection of
##### proposedreformsis based on oneof
##### twounconscious assumptions: (i) that
##### thestatusquoisperfect;or(ii)thatthe
##### choicewefaceisbetweenreformand
##### no action; if theproposed reform is
##### imperfect,we presumablyshould take
##### noaction atall, while wewait fora
##### perfectproposal.
##### Butwecanneverdonothing.That
##### whichwehavedonefor thousandsof
##### years is also action. Italso produces
##### evils. Once we are aware that the
```
1247
```
```
on March 12, 2021^
```
```
http://science.sciencemag.org/
```
```
Downloaded from
```
```
statusquoisaction,wecanthencom-
```
##### pare its discoverable advantages and
##### disadvantages with the predicted ad-
##### vantagesanddisadvantagesofthepro-
##### posed reform, discounting as bestwe
##### canforourlackofexperience.Onthe
##### basis of such a comparison, we can
##### makearationaldecisionwhichwillnot
##### involvetheunworkableassumptionthat
onlyperfectsystemsaretolerable.
##### RecognitionofNecessity
```
Perhapsthesimplestsummaryofthis
```
##### analysis ofman'spopulation problems
##### isthis: the commons, if justifiable at
##### all,isjustifiable onlyunderconditions
##### oflow-population density. As thehu-
##### man population has increased, the
##### commonshashadtobeabandonedin
oneaspectafteranother.
##### Firstweabandonedthecommonsin
##### food gathering, enclosing farm land
##### and restricting pastures and hunting
##### and fishing areas. These restrictions
##### are still not complete throughout the
##### world.
##### Somewhatlaterwesawthatthecom-
##### mons as a place for waste disposal
##### wouldalsohavetobeabandoned. Re-
##### strictions onthe disposalof domestic
##### sewage are widely accepted in the
#### Westernworld;weare stillstruggling
##### toclosethecommons topollutionby
##### automobiles, factories, insecticide
#### sprayers, fertilizing operations, and
##### atomicenergyinstallations.
##### Inastillmoreembryonicstateisour
##### recognitionoftheevilsofthecommons
#### inmattersofpleasure.Thereisalmost
##### no restriction on the propagation of
#### soundwavesinthepublicmedium.The
##### shoppingpublicisassaultedwithmind-
#### less music, without its consent. Our
##### government is paying out billions of
##### dollars to create supersonic transport
##### which will disturb 50,000 people for
```
everyonepersonwhoiswhiskedfrom
coast to coast 3 hours faster. Adver-
```
##### tisersmuddytheairwavesofradioand
##### television and pollute the view of
```
travelers.Wearealongwayfromout-
```
##### lawing the commons in matters of
```
pleasure. Is this because our Puritan
```
##### inheritance makesusview pleasureas
```
somethingofa sin,andpain (thatis,
```
##### thepollutionofadvertising)asthesign
##### ofvirtue?
```
Every new enclosure of the com-
```
##### mons involves the infringement of
##### somebody's personal liberty. Infringe-
##### mentsmadeinthedistantpastareac-
##### cepted becausenocontemporary com-
```
plainsof a loss. It isthe newlypro-
```
##### posedinfringementsthatwevigorously
##### oppose;criesof"rights"and"freedom"
##### fillthe air.But whatdoes "freedom"
##### mean?Whenmen mutually agreedto
##### passlawsagainstrobbing,mankindbe-
##### camemorefree,notlessso.Individuals
##### lockedinto thelogicofthe commons
##### arefreeonlytobringonuniversalruin;
##### once theyseethe necessityofmutual
##### coercion, they become free to pursue
##### othergoals.IbelieveitwasHegelwho
##### said, "Freedom is the recognition of
##### necessity."
##### Themostimportantaspectofneces-
##### sitythatwemustnowrecognize,isthe
#### necessityof abandoning the commons
##### inbreeding. Notechnicalsolutioncan
##### rescueusfromthemiseryofoverpopu-
#### lation. Freedom to breed will bring
##### ruin to all.At the moment,to avoid
#### harddecisionsmanyofusaretempted
##### to propagandize for conscience and
#### responsible parenthood. The tempta-
##### tion mustbe resisted,because an ap-
##### peal to independently acting con-
##### sciences selects for the disappearance
##### ofallconscienceinthelongrun,and
#### anin,creaseinanxietyintheshort.
```
Theonlywaywe canpreserveand
nurtureotherandmore preciousfree-
```
##### doms is byrelinquishingthe freedom
##### tobreed,andthatverysoon."Freedom
##### istherecognitionofnecessity"-andit
##### istheroleofeducationtorevealtoall
##### the necessity of abandoning the free-
#### domtobreed.Onlyso,canweputan
##### endtothisaspectofthetragedyofthe
```
commons.
```
```
References
1.J.B. WiesnerandH. F.York,Sci.Amer.
211 (No.4),^27 (1964).
2.G.Hardin,J.Hered.50,^68 (1959);S.von
Hoernor,Science137, 18 (1962).
3.J.vonNeumannand0.Morgenstern,Theory
ofGamesandEconomicBehavior(Princeton
Univ.Press,Princeton,N.J.,1947),p.11.
4.J.H.Fremlin,NewSci.,No. 415 (1964),p.285.
5.A. Smith, The WealthofNations (Modem
Library,NewYork,1937),p.423.
6.W.F.Lloyd,TwoLecturesontheChecksto
Population(OxfordUniv.Press,Oxford,Eng-
land,1833),reprinted(inpart>inPopulation,
Evolution, and Birth Control, G. Hardin,
Ed. (Freeman,SanFrancisco,1964),p.37.
7.A.N. Whitehead, Science andtheModern
World(Mentor,NewYork,1948),p.17.
8.G. Hardin,Ed. Population, Evolution,and
BirthControl(Freeman,SanFrancisco,1964),
p.56.
9.S.McVay,Sci.Amer.^216 (No.8>,^13 (1966).
10.J. Fletcher, Situation Ethics (Westminster,
Philadelphia, 1966).
11.D.Lack,TheNaturalRegulation ofAnimal
Nuimbers (Clarendon Press, Oxford, 1954).
12.H. Girvetz,FromWealthto Welfare(Stan-
fordUniv.Press,Stanford, Calif.,1950).
13.G.Hardin,Perspec.Biol.Med.6,^366 (1963).
14.U.Thant,Int.PlannedParenthoodNews,No.
168 (February1968>,p.3.
15.K. Davis,Science158, 730 (1967).
16.S. Tax,Ed.,EvolutionafterDarwin(Univ.
ofChicagoPress,Chicago,1960),vol.2,p.
469.
17.G.Bateson,D.D.Jackson,J.Haley,J.Weak-
land,Behav.Scd.1,^251 (1956).
18.P.Goodman,New York Rev.Books 10(8),
22 (23May1968).
19.A. Comfort, The Anxiety Makers (Nelson,
London,1967).
20.C.Frankel,TheCaseforModernMan(Har-
per,NewYork,1955),p.203.
21.J.D.Roslansky,GeneticsandtheFutureof
Man (Appleton-Century-Crofts, New York,
1966),p.177.
```
```
1248 SCIENCE,VOL.^162
```
```
on March 12, 2021^
```
```
http://science.sciencemag.org/
```
```
Downloaded from
```
The Tragedy of the Commons
Garrett Hardin
DOI: 10.1126/science.162.3859.
Science 162 (3859), 1243-1248.
```
ARTICLE TOOLS http://science.sciencemag.org/content/162/3859/
```
```
REFERENCES
http://science.sciencemag.org/content/162/3859/1243#BIBL
```
```
This article cites 11 articles, 2 of which you can access for free
```
```
PERMISSIONS http://www.sciencemag.org/help/reprints-and-permissions
```
Use of this article is subject to the Terms of Service
trademark of AAAS.
Advancement of Science, 1200 New York Avenue NW, Washington, DC 20005. The title Science is a registered
Science (print ISSN 0036-8075; online ISSN 1095-9203) is published by the American Association for the
of Science. No claim to original U.S. Government Works.
Copyright © 1968 The Authors, some rights reserved; exclusive licensee American Association for the Advancement
```
on March 12, 2021^
```
```
http://science.sciencemag.org/
```
```
Downloaded from
```