# Value pluralism and the radical centre: why radical centrism needs Isaiah Berlin > Value pluralism is Isaiah Berlin's claim that human values such as liberty, equality, justice and mercy are all genuine, can conflict, and cannot be reduced to one master value or measured on one scale. Radical centrism needs this idea because it explains why politics is a choice between goods and why splitting the difference is a poor answer. Combined with Amartya Sen's partial rankings, pluralism gives a method: name the goods in conflict, design for as many as possible at once, and where a trade-off remains, choose in public and compensate those who lose. - URL: https://www.radicalcentre.eu/en/articles/value-pluralism-radical-centre-berlin - Language: en - Publisher: radical centre / centro radical - Published: 2026-10-11 - Topic: Ideas & history - Author: radical centre - Licence: CC BY 4.0 ## Key points - Isaiah Berlin rejected monism, the belief that every question has one true answer and that all true answers fit together. - Value pluralism holds that liberty, equality, justice and mercy are all real goods that can collide, with no common currency between them. - Pluralism differs from relativism: Berlin appealed to a shared human horizon that lets people across cultures understand each other. - Amartya Sen's flute example shows several impartial principles surviving scrutiny at once, which is pluralism in practice. - For radical centrism, pluralism justifies synthesis: design policies that serve several goods, and choose openly where a trade-off remains. The programme behind this site makes a strong claim in its first week: radical centrism needs pluralism more than it needs moderation. The idea comes from Isaiah Berlin, and it is worth spelling out why, because it changes what a centre is for. Berlin set out his value pluralism most famously at the close of *Two Concepts of Liberty* (1958). The Stanford Encyclopedia of Philosophy summarises his target as monism, a belief with three parts: every genuine question has one true answer, that answer can be found, and all the true answers fit together into a single harmonious whole. Berlin rejected all three, and in ethics he rejected the third with special force. Liberty and equality, justice and mercy, are all real goods. They clash. There is no common currency for converting one into another, and no rule that always ranks one above the rest. Conflict between values is, in the Encyclopedia's phrase for Berlin's view, an intrinsic, irremovable element in human life. ## What pluralism rules out The first consequence is political humility. If no formula ranks every good, then nobody holds the key to the perfect society, and nobody may sacrifice living people to bring it about. Berlin took that principle from the Russian writer Alexander Herzen, who condemned the sacrifice of human beings on the altar of abstractions. It is the liberal and conservative strand in Berlin, the suspicion of grand designs and of rulers who claim to know where history is heading. The second consequence points the other way. Berlin's pluralism also lists equality, justice and the protection of the weak among the genuine goods. The Encyclopedia describes a social-democratic willingness in Berlin to restrict liberty to promote equality and justice and to protect the vulnerable. Liberty matters, and it takes its place among other values. A politics that treats freedom as the only value is as monist as one that treats equality that way. Pluralism also rules out relativism. Berlin insisted on a shared human horizon, a moral core that lets people from different cultures understand each other and recognise cruelty. Values are many; some acts remain plainly wrong. ## Comparing without a common unit The obvious objection is practical. If values have no common measure, how does anyone decide anything? Philosophers have offered several answers, which the Encyclopedia's entry on value pluralism reviews. Ruth Chang argues that incommensurability, the lack of a single unit, does not imply incomparability: we can still judge one option better than another without putting a number on either. Others rely on practical wisdom, the trained judgement of someone who sees what a situation needs. Some accept that a few conflicts are truly irresolvable, and John Kekes adds a useful civic point: such disagreements need not be due to wickedness on the other side. Amartya Sen, the other philosopher on this week's reading list, supplies a working version. In *The Idea of Justice* he tells of three children and a flute. One plays it best, one is the poorest, one made it. As Charles Barclay Roger's review for openDemocracy sets out, each claim rests on a principle that passes the test of impartiality, which is Berlin's pluralism in miniature. Sen's answer is that partial rankings, reached through open public reasoning, are enough to act on. We do not need to settle which principle is supreme to agree that some options are clearly better than others. ## From pluralism to synthesis Here is where pluralism turns into a method for the radical centre. Moderation takes two camps and looks for the midpoint: one side wants nothing, the other wants a hundred, so settle on fifty. Pluralism asks a different question first. What good is each camp defending? Very often both are defending something real. Once those goods are named, it becomes possible to look for a design that serves more of them at once, the 120 option in the programme's language. Take pensions, a case this site covered earlier in the week. One camp defends security in old age; another defends fiscal sustainability and fairness to younger workers. Both are real goods. Splitting the difference gives a pension that is a bit less secure and a bit less affordable. A pluralist design asks how to protect a floor for every pensioner while making the system respond automatically to life expectancy, and how to compensate those who lose from the change. Pluralism also explains why synthesis sometimes fails. Some trade-offs are real all the way down. Berlin's honest answer was to choose case by case, keeping an uneasy balance that avoids intolerable choices and extremes of suffering. For a radical centre that turns into a working practice. Look first for designs that serve several goods. Where a trade-off remains, make the choice in public and say which good gave way. And compensate the people who bear the cost, because a choice between real goods always leaves someone with a real loss. ## Why this is the radical part Pluralism makes radical centrism more demanding than moderation. A moderate can stay calm and average out the positions on offer. A pluralist has to take each camp's core value seriously enough to build for it, and has to accept that the result will still disappoint someone. That is uncomfortable, and it is also what lets a centre propose things neither side would have designed alone. Berlin was a liberal who knew that liberty has rivals. Sen is a theorist of justice who knows that justice can speak with several voices. This weekend's exercise, a short constitution of rules for deciding policy, starts from both of them, and pluralism belongs among its rules. ## FAQ ### What is value pluralism? The view, most associated with Isaiah Berlin, that there are many distinct values, such as liberty, equality and friendship, that cannot all be reduced to one supreme value and that can genuinely conflict. ### Is value pluralism the same as relativism? No. Pluralism says several values are objectively good and can clash. Relativism says values are only true relative to a culture. Berlin held that a shared human horizon makes cross-cultural understanding and moral criticism possible. ### How does value pluralism relate to radical centrism? It explains why political camps each defend something real. Radical centrism uses that to look for policies that serve several of those goods together, instead of picking a midpoint between camps. ## Sources - [Value Pluralism](https://plato.stanford.edu/entries/value-pluralism/), Stanford Encyclopedia of Philosophy (2023) - [Isaiah Berlin](https://plato.stanford.edu/entries/berlin/), Stanford Encyclopedia of Philosophy (2024) - [Amartya Sen and the idea of justice](https://www.opendemocracy.net/en/amartya-sen-and-idea-of-justice/), openDemocracy (2010)