Rerum novarum and Catholic social teaching

The industrial revolution changes the relationship between employers and workers

In the nineteenth century, Western Europe saw production, the city, work and poverty transformed. The old artisanal and rural world did not disappear overnight, but it was dominated by new forms of industrial concentration: factories, mines, mills, great fortunes, the urban proletariat, wage dependence and social conflict.^[6]

Leo XIII sums up the diagnosis in the opening lines: industry has developed, methods have changed, relations between employers and workers have been altered, wealth has accumulated in the hands of a few while the multitude remains in indigence.^[7]

"Wealth has flowed into the hands of a small number, and the multitude has been left in indigence." — Leo XIII, Rerum novarum, § 1^[8]

This sentence is not a political slogan. It describes a situation already debated everywhere by states, economists, labour movements and social Catholics. The encyclical was therefore not born in a Roman bubble: it intervenes at the heart of a crisis everyone recognises, but whose solutions are violently disputed.

The labour question becomes a moral question

The decisive novelty is not only economic. For Leo XIII, the condition of workers directly concerns Christian morality: dignity of the person, justice of wages, rest time, health, family, religious practice, education, the right of association, property, the role of public authority.

The problem is not that workers are poor in general. The problem is that an economic order can produce a structural poverty in which a man works hard without being able to support his family decently. At that point, the question is no longer merely technical; it becomes a question of justice.

Two false exits: collectivism and absolute liberalism

Leo XIII sees two opposite temptations. The first is collectivist socialism: abolishing private property, transferring goods to the commune or the state, claiming to solve misery by abolishing personal ownership.^[9]

The second is named at less length, but it runs through the whole text: believing that free contract always suffices to produce justice. Yet a starving worker is not in the same real situation as a powerful employer. He can "accept" an unjust wage because he has no other choice.

Catholic originality consists in refusing these simplifications. The Church does not merely say "neither right nor left"; it proposes a moral architecture: private property, yes; but property ordered to the common good. Freely negotiated wages, yes; but subject to a higher law of justice. State intervention, yes; but without absorbing the family, the trades, the unions and the intermediate bodies.

Private property: a natural right, not an absolute one

The first great thesis of the encyclical is the defence of private property. Leo XIII roots it in human nature: man works, provides for the future, founds a family, passes things on, seeks stability for his own. Abolishing all personal property wounds the concrete freedom of families and gives the state excessive power.^[10]

But property is not divinised. Leo XIII takes up the tradition of Saint Thomas: personal ownership may be legitimate, but the use of goods must remain directed towards the needs of others and towards the common good. The Compendium will make this link explicit by placing the universal destination of goods alongside private property.^[11]

The just wage: more than a mere market price

The doctrine of the just wage is the most durably quoted passage of Rerum novarum. Leo XIII starts from a simple distinction: work is personal, but it is also necessary. Personal, because the worker commits his strength, his time, his life; necessary, because the fruit of this work enables him to live.^[12]

From this follows a moral limit on pure contract. Even if employer and worker "agree" on a wage, there is a norm of justice prior to their agreement. The worker must not be paid only according to what the market can impose, but according to what enables him to live soberly and honourably.

"Wages must not be insufficient to support the sober and honest worker." — Leo XIII, Rerum novarum, § 34^[13]

This formula has enormous scope. It means that a contract can be legal and yet unjust. It founds the Catholic idea of the family wage, or at least of a wage genuinely able to support the life of the worker and his family.

The duties of employers and workers

Leo XIII refuses to build the social order on claims alone. Workers have rights; they also have duties: to perform the agreed work loyally, not to destroy property, not to resort to violence, to refuse agitators who exploit their distress.^[14]

Employers, for their part, must respect the human and Christian dignity of the worker. They cannot treat the worker as an anonymous force of production. They must protect his health and take account of his age, sex, family, religious practice and real needs.^[15]

Unions and professional associations

The encyclical recognises a central role for workers associations. This point is essential: the Church does not ask workers to wait passively for the charity of the rich. It encourages organised forms of protection, mutual aid, defence of interests and moral formation.^[16]

Leo XIII speaks in the vocabulary of his time: corporations, unions, associations, mutual aid societies. The principle remains: between the isolated individual and the state, there must exist intermediate bodies capable of defending real persons.

Neither an absent state nor a total state

The state is not the enemy by nature. Its mission is to protect the common good, peace, justice, families, legitimate property and the weak. But it must not absorb everything. Leo XIII rejects both the collectivist state that seizes goods and the indifferent state that lets the weak be crushed by the strong.^[17]

When the health of workers is threatened, when religious rest becomes impossible, when the family breaks down under the effect of excessive working conditions, when children or women are employed in ways contrary to their dignity, public authority may intervene within just limits.^[18]

The root of subsidiarity

The word "subsidiarity" was not yet systematically formulated in 1891. It would be, by Pius XI in Quadragesimo anno in 1931. But the principle is already present: solutions must first pass through families, associations, trades, unions and local institutions; the state intervenes as support and protection, not as the universal owner of society.^[19]

"Just as what private individuals can accomplish on their own initiative and by their own means must not be taken from them to be transferred to the community, so it would be an injustice, while at the same time gravely disturbing the social order, to withdraw from lower groupings, in order to entrust them to a wider and higher collectivity, the functions they are able to fulfil themselves. The natural object of any intervention in social matters is to help the members of the social body, and not to destroy or absorb them." — Pius XI, Quadragesimo anno, § 79^[20]

Subsidiarity is therefore not an excuse for abandoning the poor. It is the rule that prevents injustice from being solved by destructive centralisation. It asks the higher authority to help the lower authority when it is powerless, but not to replace it when it can act.

The common good: broader than economics

For the Church, the economy is never a separate world. It belongs to the moral order because it affects the lives of persons. The common good includes the social conditions that enable persons, families and groups to fulfil their vocation more fully.^[21]

This explains why Rerum novarum also speaks of religion, morals, Sunday, family, savings, education and social peace. A society may produce great wealth and remain morally sick if that wealth destroys the family, prevents rest, humiliates the poor or turns everything into merchandise.

Social doctrine is born of the Gospel applied to history

The Compendium of the Social Doctrine of the Church defines the permanent principles of Catholic social teaching: the dignity of the human person, the common good, subsidiarity and solidarity, to which are joined the universal destination of goods, participation and social justice.^[22]

"The permanent principles [...] constitute the true foundations." — Compendium of the Social Doctrine of the Church^[23]

This doctrine is not a third political party. It does not automatically supply a government programme. It gives principles of judgment, criteria of discernment and orientations for action.

The four structuring principles

These principles prevent the Church from being reduced to a political sensibility. An economic liberal can be corrected by the dignity of the worker and the just wage. A socialist can be corrected by private property, the family and subsidiarity. A conservative can be corrected by the option for the poor. A progressive can be corrected by natural law, the family and moral truth.

A biblical and patristic tradition

Rerum novarum does not start from nothing. Deuteronomy forbids withholding the wages of the poor; the prophets denounce those who crush the needy; Saint James affirms that withheld wages cry out before God; the Fathers recall that the rich man administers goods destined also for the poor.^[24][25][26]

Leo XIII gives this tradition a form adapted to industrial society. He does not replace personal charity with social policy; he shows that charity itself calls for just institutions.

Pius XI: Quadragesimo anno and subsidiarity

In 1931, forty years after Rerum novarum, Pius XI published Quadragesimo anno. The context has changed: the great economic crisis, concentration of financial power, totalitarianisms, fascism, communism, unstable capitalism. Pius XI takes up Leo XIII but extends the labour question to the entire economic order.^[27]

He clearly formulates the principle of subsidiarity, criticises economic concentration and rejects both state collectivism and unbridled liberalism. Quadragesimo anno shows that social doctrine advances through fidelity and deepening, not rupture.

John XXIII, Paul VI and Vatican II: integral development

John XXIII published Mater et magistra in 1961 and then Pacem in terris in 1963. Social doctrine opens more widely to human rights, international peace, the development of peoples, the agricultural world, decolonisation and global cooperation.^[28]

Paul VI published Populorum progressio in 1967. There he affirms that development cannot be reduced to economic growth: it must be integral, that is, concerned with every man and the whole man.^[29]

Vatican II, notably in Gaudium et spes, inscribes this perspective within the mission of the Church to the contemporary world. The Church does not withdraw from history; it reads the joys, hopes, griefs and anxieties of men in the light of Christ.^[30]

John Paul II: Centesimus annus and post-communism

In 1991, John Paul II published Centesimus annus for the centenary of Rerum novarum, two years after the fall of the Berlin Wall. He reread the encyclical of Leo XIII in the light of the collapse of communism and the risks of a victorious but soulless capitalism.^[31]

He recognises the value of enterprise, the market and economic freedom when they serve the person. But he warns that the market cannot become the sole measure of society. Some goods are not for sale; some forms of poverty are not solved by growth alone; some economic freedoms become unjust when they crush human dignity.^[32]

"It would appear that, on the level of individual nations and of international relations, the free market is the most efficient instrument for utilizing resources and effectively responding to needs." — John Paul II, Centesimus annus, § 34^[33]

The quotation is often isolated. The complete text immediately qualifies this recognition: the market is valid for solvable needs and saleable resources; it does not suffice for everything that concerns justice, dignity and fundamental rights.

Benedict XVI and Francis: charity, integral ecology, fraternity

Benedict XVI published Caritas in veritate in 2009. There he recalls that social doctrine is a proclamation of the truth of love in economic, political and international realities. Charity is not sentimental: it must become social intelligence, institution, justice and development.^[34]

Francis deepens the same line with Laudato si (2015), Fratelli tutti (2020) and several texts on the economy, migrants, war and technocracy. He insists on integral ecology: the social crisis and the environmental crisis are linked, because the poor and creation are wounded by the same logic of exploitation.^[35]

Leo XIV: the new res novae of artificial intelligence

On 15 May 2026, the 135th anniversary of Rerum novarum, Leo XIV signed Magnifica humanitas on the protection of the human person in the age of artificial intelligence. There he explicitly presents AI as a new historical transformation comparable, in scale, to the "new things" Leo XIII had discerned in 1891.^[36]

"Nourished by this fruitful dialogue between the Gospel and human knowledge, the Church has progressively deepened its social doctrine, bringing to maturity over time a heritage of wisdom endowed with a theological and anthropological coherence rooted in the Christian vision of the person." — Leo XIV, Magnifica humanitas, § 24^[37]

The continuity is striking. In 1891, the question was: what becomes of the worker when the industrial machine, capital and the factory change his world? In 2026, the question becomes: what becomes of the person when algorithms, robotics, data and digital power change work, war, education, public truth and freedom?

It is not a ready-made economic programme

The encyclical does not settle every public policy choice. It does not say what exact level of minimum wage to adopt, which tax regime to choose, which form of social security to establish, which model of union to prefer. It gives principles which then oblige lay people, economists, political leaders and intermediate bodies to discern.

This distinction is essential. Social doctrine is not an ecclesiastical technocracy. It does not replace political prudence. But it prevents prudence from becoming a pretext for ignoring justice.

It is not a soft compromise between capitalism and socialism

Rerum novarum is sometimes presented as a middle way: a little property, a little social protection, a little morality. That is too weak. The text proposes a complete anthropological vision: man is a person, not a cog; a family, not an abstract individual; a worker, not a commodity; a Christian called to God, not merely a producer and consumer.

Leo XIII does not seek to balance two ideologies. He judges both from a higher principle: human dignity created by God, wounded by sin, called to justice and charity.

It is not a canonisation of the nineteenth-century social order

The encyclical contains formulations marked by its time. It speaks of corporations, of sexes and ages at work, of still highly paternalistic social relations. But the doctrine is not reducible to these historical forms. What remains is the architecture: person, family, property, labour, wage justice, associations, the state as guardian of the common good, refusal of class struggle.

The later tradition has deepened several points: human rights, democratic participation, development of peoples, ecology, migration, globalisation, finance, war, technology, artificial intelligence. This growth is not a betrayal of Rerum novarum; it is its fruitfulness.

Forming one social conscience

A Catholic cannot reduce faith to private morality. Mass, confession, prayer and family life are central; but they never dispense from justice towards one neighbour. Withholding wages, despising the poor, exploiting an employee, fraud, humiliating the weak or organising the economy against the family are moral questions.

The companion article Should we be on the right or on the left? develops this point: social doctrine judges political camps; it does not belong to them. Rerum novarum obliges Catholics to refuse both contempt for the poor and idolatry of the state.

Reading social conflicts without class hatred

Leo XIII does not deny conflicts. He sees them. But he refuses to absolutise them into a final struggle between irreconcilable classes. The Church defends justice, not hatred. It wants employers, workers, families, unions, associations and the state to seek a social peace founded on truth.

This position demands courage. It displeases ideologies that live off the enemy. The unjust employer dislikes hearing about sufficient wages; the revolutionary militant dislikes hearing about private property and workers duties; the centralising state dislikes hearing about subsidiarity; the individualist dislikes hearing about solidarity.

Applying Rerum novarum to the digital economy

Platforms, AI, remote work, automation, algorithmic surveillance and freelance precariousness produce new situations. Yet the questions of 1891 return in other forms:

The Catholic principle remains identical: technology must serve the person, not absorb him. The digital economy does not escape the moral law because it appears immaterial.

To understand Rerum novarum, one must first read the texts of the Magisterium, not only commentaries:

• Should we be on the right or on the left? — social doctrine as a compass beyond political camps.
• What should we think of ecology? — integral ecology as a contemporary social extension.
• Solidarnosc and Saint John Paul II — a historical application of social doctrine against communism.
• The Syllabus of Pius IX — the nineteenth-century doctrinal context before Leo XIII.
• The capture of Rome in 1870 — the political upheaval preceding the pontificate of Leo XIII.