TWO YEARS ago The Economist constructed an index of crony capitalism. It was designed to test whether the world was experiencing a new era of “robber barons”—a global re-run of America’s gilded age in the late 19th century. Depressingly, the exercise suggested that since globalisation had taken off in the 1990s, there had been a surge in billionaire wealth in industries that often involve cosy relations with the government, such as casinos, oil and construction. Over two decades, crony fortunes had leapt relative to global GDP and as a share of total billionaire wealth.