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Chester W. Wright (1941). Economic History of the United States, p. xi-xii " Wright (1941)
Source: Understanding Capitalism: Competition, Command, and Change, 2005, p. 57
Source: Contributions to Modern Economics (1978), Chapter 7, Marx, Marshall and Keynes, p. 75
Source: The rise of the western world, 1973, p. vii, Preface
Source: Economics after the crisis : objectives and means (2012), Ch. 2 : Financial Markets: Efficiency, Stability, and Income Distribution
New millennium, An Interview with Paul A. Samuelson, 2003
Frisch (1927). as quoted in: Bjerkholt, Olav, and Duo Qin. A Dynamic Approach to Economic Theory: The Yale Lectures of Ragnar Frisch. Routledge, 2010: About "Oekonometrika"
1920
Development, Geography, and Economic Theory (1995), Ch. 2. Geography Lost and Found
Source: The Economics of Welfare (1920), Ch. 1 : Welfare and Economic Welfare, § 4