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The Romer/Romer letter to Professor Gerald Friedman marks a turning point. It concedes that there are indeed important issues at stake when evaluating the proposed economic policies of Presidential Candidate Bernie Sanders. These issues go beyond the political debate and should be discussed seriously between and among professional economists.

The International Monetary Fund’s chief economist, Olivier Blanchard, recently asked a simple and important question: “How much of an adjustment has to be made by Greece, how much has to be made by its official creditors?” But that raises two more questions: How much of an adjustment has Greece already made? And have its creditors given anything at all?

What is “capital”? To Karl Marx, it was a social, political, and legal category—the means of control of the means of production by the dominant class. Capital could be money, it could be machines; it could be fixed and it could be variable. But the essence of capital was neither physical nor financial. It was the power that capital gave to capitalists, namely the authority to make decisions and to extract surplus from the worker.

This paper describes the broad evolution of inequality in the world economy over the past four decades, and provides a summary account of the relationship between inequality, economic development, political regimes and the functional distribution of income.