AMERICA is the wealthiest country in the world and its rich keep earning more. In 2007, the latest year for which data are available, the top 1% increased their share of the country's income to 23.5%, according to analysis of tax returns by a pair of economists, Emmanuel Saez and Thomas Piketty. The concentration of income earned by this top percentile now stands at its highest since 1928. Two-thirds of the country's total gains in the five years to 2007 accrued to the top 1%, whereas the bottom 90th percentile saw only 12% of the extra income.

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