equation, the Fisher hypothesis, and the Fisher separation theorem are named. In 1892's Mathematical Investigations in the Theory of Value and Prices and 1896's Appreciation and Interest, Fisher explores: . how the numbers of consumers and the numbers of available commodities are more mysterious than they seem at first glance . what happens when production and consumption are examined jointly . how commodities influence one another . the relationship between appreciation and debt . formulas for varying rates of interest and appreciation . the impacts of zero and negative interest . and much more. American economist IRVING FISHER (1867-1947) was professor of political economy at Yale University. Among his many books are The Rate of Interest (1907), Why Is the Dollar Shrinking? A Study in the High Cost of Living (1914), Booms and Depressions (1932), and The Purchasing Power of Money (1912).

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