ANY mention of redistribution of wealth in America would normally scupper a politician's ambitions, but Barack Obama has managed to preserve his lead in the polls while also saying that he wants to “spread the wealth around”. And there is a lot of spreading potential: income distribution in America is the widest of the 30 countries of the OECD. The top 10% (or decile) of earners have an average $87,257 of disposable income, while those in the bottom decile have $5,819, among the very lowest of any country. Britain, Canada and Luxembourg also see big differences between the richest and poorest.

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