The core of his complex input-output system is a gridlike table showing what individual industries buy from and sell to one another. With the addition of government, consumers, foreign countries, and other elements, there emerges a general outline of the goods and services circulating in a national economy. The input-output method of economic analysis is used in various forms in more than 50 industrialized countries for planning and forecasting.
Leontief is also distinguished for having developed linear programming, a mathematical technique for solving complex problems of economic operations. He also is known for the "Leontief Paradox," his finding that, in the United States, capital rather than labour is the relatively scarce factor of production.
Among his major publications are The Structure of the American Economy
1919-1929: An Empirical Application of Equilibrium Analysis (1941) and
Input-Output Economics (1966).
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