Private Property
From Aristotle's defence to the digital commons — 2,400 years of arguing over what it means to own.
Each star is a thinker or work; solid lines draw the constellation of a school, dashed threads the passage of ideas between eras.
Select any point on the timeline to read about it.
All entries by era
Private Property 400 BCE – 2030 CE
From Aristotle's defence to the digital commons — 2,400 years of arguing over what it means to own.
- 450 BCE
Roman Twelve Tables. Rome's earliest code fixes ownership (dominium) and the formal ritual of transfer (mancipatio). Property stops being mere possession and becomes a legal title enforceable by the state.
- 350 BCE
Aristotle, Politics. Against Plato's communal ownership, Aristotle argues that property should be privately held but 'common in use'. Only what one owns can be given generously; abolishing property, he warns, abolishes the exercise of virtue.
- 533 CE
Justinian, Corpus Juris Civilis. Justinian's compilation systematises Roman property doctrine — the distinction between ownership and possession, usufruct, servitudes — a vocabulary European law still speaks today.
- 1274 CE
Thomas Aquinas, Summa Theologiae. Aquinas reconciles property with Christian ethics: humans may rightly hold and manage goods privately, but their use must serve the common good. Superfluous wealth, he holds, belongs to the poor.
- 1690 CE
John Locke, Second Treatise. Locke grounds property in labour: by mixing his work with nature, a person makes a thing his own. This 'labour theory' becomes the moral cornerstone of liberal and later constitutional property rights.
- 1755 CE
Rousseau, Discourse on Inequality. 'The first man who, having enclosed a piece of ground, said This is mine...' For Rousseau property is not natural right but a founding act of the social order — and the root of inequality and conflict.
- 1789 CE
French Declaration of Rights, Art. 17. The Revolution enshrines property as 'an inviolable and sacred right', from which no one may be deprived save for public necessity and with just compensation — the template for modern takings law.
- 1848 CE
Marx & Engels, Communist Manifesto. Marx recasts private property as a historical relation of production, not a natural fact. The Manifesto's single demand — 'abolition of private property' — means the bourgeois form: the private ownership of the means of production.
- 1960 CE
Ronald Coase, 'The Problem of Social Cost'. Coase shows that when property rights are clearly assigned and bargaining is costless, resources flow to their most valued use regardless of who holds the right. Where transaction costs are high, the initial allocation of rights matters enormously.
- 1968 CE
Garrett Hardin, 'The Tragedy of the Commons'. Hardin argues that a resource open to all is inevitably overused, since each user gains privately while the cost is shared. The essay makes 'privatise or regulate' the default policy reflex for shared resources.
- 1990 CE
Elinor Ostrom, Governing the Commons. Ostrom documents communities that manage shared resources sustainably for centuries without either private ownership or state control — through local rules, monitoring and graduated sanctions. Her work (Nobel, 2009) breaks the private-or-state binary.
- 2000 CE
Hernando de Soto, The Mystery of Capital. De Soto argues that the poor already own trillions in assets, but without formal legal title this 'dead capital' cannot be leveraged, mortgaged or traded. Formal property registration, not aid, is his engine of development.
- 2009 CE
Digital & intellectual property. Software, data, genomes and tokens force the question anew: what does it mean to own something infinitely copyable? Intellectual property, open-source licences and blockchain ledgers each answer differently, re-opening a 2,400-year debate.
The milestones
c. 350 BCE
Aristotle, Politics
Property as a school of virtue
Against Plato's communal ownership, Aristotle argues that property should be privately held but 'common in use'. Only what one owns can be given generously; abolishing property, he warns, abolishes the exercise of virtue.
c. 450 BCE
Roman Twelve Tables
Ownership becomes written law
Rome's earliest code fixes ownership (dominium) and the formal ritual of transfer (mancipatio). Property stops being mere possession and becomes a legal title enforceable by the state.
533 CE
Justinian, Corpus Juris Civilis
The full grammar of ownership
Justinian's compilation systematises Roman property doctrine — the distinction between ownership and possession, usufruct, servitudes — a vocabulary European law still speaks today.
c. 1274
Thomas Aquinas, Summa Theologiae
Private holding, common purpose
Aquinas reconciles property with Christian ethics: humans may rightly hold and manage goods privately, but their use must serve the common good. Superfluous wealth, he holds, belongs to the poor.
1690
John Locke, Second Treatise
Property from labour
Locke grounds property in labour: by mixing his work with nature, a person makes a thing his own. This 'labour theory' becomes the moral cornerstone of liberal and later constitutional property rights.
1755
Rousseau, Discourse on Inequality
Property as the origin of inequality
'The first man who, having enclosed a piece of ground, said This is mine...' For Rousseau property is not natural right but a founding act of the social order — and the root of inequality and conflict.
1789
French Declaration of Rights, Art. 17
'Inviolable and sacred'
The Revolution enshrines property as 'an inviolable and sacred right', from which no one may be deprived save for public necessity and with just compensation — the template for modern takings law.
1848
Marx & Engels, Communist Manifesto
Abolish bourgeois property
Marx recasts private property as a historical relation of production, not a natural fact. The Manifesto's single demand — 'abolition of private property' — means the bourgeois form: the private ownership of the means of production.
1960
Ronald Coase, 'The Problem of Social Cost'
Property rights and transaction costs
Coase shows that when property rights are clearly assigned and bargaining is costless, resources flow to their most valued use regardless of who holds the right. Where transaction costs are high, the initial allocation of rights matters enormously.
1968
Garrett Hardin, 'The Tragedy of the Commons'
The commons dilemma
Hardin argues that a resource open to all is inevitably overused, since each user gains privately while the cost is shared. The essay makes 'privatise or regulate' the default policy reflex for shared resources.
1990
Elinor Ostrom, Governing the Commons
Commons without privatising them
Ostrom documents communities that manage shared resources sustainably for centuries without either private ownership or state control — through local rules, monitoring and graduated sanctions. Her work (Nobel, 2009) breaks the private-or-state binary.
2000
Hernando de Soto, The Mystery of Capital
Title turns assets into capital
De Soto argues that the poor already own trillions in assets, but without formal legal title this 'dead capital' cannot be leveraged, mortgaged or traded. Formal property registration, not aid, is his engine of development.
2009 →
Digital & intellectual property
Owning the intangible
Software, data, genomes and tokens force the question anew: what does it mean to own something infinitely copyable? Intellectual property, open-source licences and blockchain ledgers each answer differently, re-opening a 2,400-year debate.