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In his 2014 book, Thomas Piketty argues that wealth inequality is sharply increasing in r-g and refers to r>g as ‘the central contradiction of capitalist economics’, where r is asset returns and g is real income growth. To assess whether inequality is increasing in the (r-g)-gap this paper: 1) constructs unique annual data on asset returns for a balanced portfolio and several other variables for Britain over the period 1210-2013, and 2) examines whether the dynamics in the wealth-income ratio, W-Y, and capital’s income share, SW, are governed by (r-g). It is shown that r and g are robust and significant determinants of wealth and income inequality and that they have been the major forces behind the large inequality waves over the past eight centuries.

Is Inequality Increasing in r-g? Piketty's Principle of Capitalist Economics and the Dynamics of Inequality in Britain, 1210-2013