“It is important, therefore, to understand at the outset the simplicity of this book - what it can accomplish and what it cannot. What it does try to do is to isolate certain psychological factors and to demonstrate rigorously by quantitative scientific methods that these factors are generally important in economic development.”

Source: The Archiving Society, 1961, p. ix

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David C. McClelland 16
American psychological theorist 1917–1998

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