The use of isoquants to describe the production function did not develop to any great extent until the thirties.
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About Kenneth Boulding
Kenneth Boulding was a 20th-century American american economist. Kenneth Ewart Boulding was an English-born American economist, educator, peace activist, and interdisciplinary philosopher. Boulding was the author of two citation classics: The Image: Knowledge in Life and Society (1956) and Conflict and Defense: A General Theory (1962). Read more on Wikipedia →