In 1950 India did something no country had attempted. It gave universal adult suffrage, immediately and without qualification, to a population that was overwhelmingly poor, largely illiterate, and organised by a hereditary hierarchy two thousand years old.

Almost everyone expected it to fail. What happened instead is one of the largest natural experiments in political sociology, and its findings surprised every position — including Ambedkar's.

Reservations: the design

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The argument about reservations, stated fairly

This is a live political dispute and the sociologically serious versions of each position are worth having.

The comparative frame

Caste in the twenty-first century

Why it matters

It is the largest natural experiment in political sociology. Universal suffrage granted immediately to a hierarchical, poor, largely illiterate population of hundreds of millions. Both confident predictions failed, and what happened instead — that the hierarchy's categories became the units of democratic competition and inverted in political value — is a finding no theory anticipated.

It supplies the general lesson about administrative categories: a category that carries entitlements becomes a resource, is claimed and defended, and thereby persists. The census produced the categories (6.1.1); reservations gave them value; and now they cannot be removed. That mechanism operates wherever states classify.

It is the world's longest-running affirmative action programme, with the best-identified evidence, and anyone arguing about such policies anywhere should know what seventy years of it has established.

And it demonstrates that a hereditary hierarchy is not simply the opposite of a modern institution. Caste did not resist democracy and was not dissolved by it. The two reorganised each other — which is a better model of how institutions actually meet than the traditional/modern opposition that Part 6 keeps having to dismantle.