This paper examines some determinants of top income shares and the aggregate wealthincome ratio in the United States. The paper, first, points out the di culties in Piketty's neo-classical version of explanation of US income inequality, which stresses the e↵ect of the rising aggregate wealth-income ratio and high elasticity of factor substitution. Second, the analysis, based on a Cambridge two-class model along the lines of Kaldor (1955Kaldor ( /56, 1966 and Pasinetti (1962), highlights the role of financialization in increasing inequality. Third, the analysis suggests that the rise in the aggregate wealth-income ratio from 1980 to 2007 in the US is explained mostly by asset price inflation, not by technical relations. Finally, the analysis examines the e↵ects of the slowdown in capital accumulation on income distribution and wealth-income ratios, which are very di↵erent from those in Piketty's Capital in the twenty first century.keyword top income share, wealth-income ratio, financialization, top management pay, stock-flow consistency JEL classification E12, E21, E25, E44