Thomas Piketty’s Capital in the 21st Century tells us a great deal about the evolution of inequality in wealth and income over a long period and how that distribution is likely to evolve unless we intervene. What Piketty does not do is to tell us why inequality is bad or why people care about inequality, although we can glean some knowledge of his personal beliefs here and there. In what follows I draw on some aspects of Rousseauvian moral psychology to suggest that the reasons people care about inequality matter enormously and that because some people value inequality for its own sake, it will be harder (even harder than Piketty thinks) to steer our societies away from the whirlpool of inequality.
In the book, Piketty argues that, without significant political intervention, it is likely that wealth inequality will increase dramatically in the coming century and that a class of rentiers will come to dominate over those who earn their incomes from labour, just as previous classes of rentiers did before the twentieth century. His book tells of a U-shaped pattern in the evolution of inequality in the past hundred years, with high levels of inequality being reduced but then bouncing back. Striking levels of economic growth coupled with the destruction by war and revolution of the wealth that formed the background to previous inequality, led to societies that were an unprecedented combination of egalitarianism and meritocracy, where those who worked hard could do well for themselves and where the domination over the living by wealth inherited from ancestors had become greatly diminished.