David Goodhart's essay challenging liberals to rethink their attitudes to diversity and the welfare state has provoked a bitter debate among progressive thinkers. Here, The Guardian publishes it in full.
Britain in the 50s was a country stratified by class and region. But in most of its cities, suburbs, towns and villages there was a good chance of predicting the attitudes, even the behaviour, of the people living in your immediate neighbourhood.
In many parts of Britain today that is no longer true. The country has long since ceased to be Orwell's "family" (albeit with the wrong members in charge).
To some people this is a cause of regret and disorientation - a change that they associate with the growing incivility of modern urban life. To others it is a sign of the inevitable, and welcome, march of modernity. After three centuries of homogenisation through industrialisation, urbanisation, nation-building and war, the British have become freer and more varied. Fifty years of peace, wealth and mobility have allowed a greater diversity in lifestyles and values. To this "value diversity" has been added ethnic diversity through two big waves of immigration: the mainly Commonwealth immigration from the West Indies and Asia in the 1950s and 1960s, followed by asylum-driven migrants from Europe, Africa and the greater Middle East in the late 1990s.
The diversity, individualism and mobility that characterise developed economies - especially in the era of globalisation - mean that more of our lives is spent among strangers. Ever since the invention of agriculture 10,000 years ago, humans have been used to dealing with people from beyond their own extended kin groups. The difference now in a developed country such as Britain is that we not only live among stranger citizens but we must share with them. We share public services and parts of our income in the welfare state, we share public spaces in towns and cities where we are squashed together on buses, trains and tubes, and we share in a democratic conversation - filtered by the media - about the collective choices we wish to make. All such acts of sharing are more smoothly and generously negotiated if we can take for granted a limited set of common values and assumptions. But as Britain becomes more diverse that common culture is being eroded.