Although real incomes in rich countries have doubled in the last thirty years, the populations of these countries work harder than ever and are no happier. This raises the question of why they are still on the growth treadmill. Is it because capitalism needs constantly to expand markets, and ensnare by advertising more and more people into useless consumption? Is it because economists have ignored the fact that, as societies become wealthier, positional goods — goods which satisfy not our needs, but our longing for status — become more and more desirable? Is it because globalization has made affluence too insecure and too uneven in its spread for most people in wealthy societies to ease off work? Or is it because we lack any agreed idea of the good life in the name of which we can say “enough is enough”?