“Anyone who believes exponential growth can go on forever in a finite world is either a madman or an economist.”

—  Kenneth E. Boulding

Attributed to Kenneth Boulding in: United States. Congress. House (1973) Energy reorganization act of 1973: Hearings, Ninety-third Congress, first session, on H.R. 11510. p. 248
1970s
Variant: Anyone who believes in indefinite growth in anything physical, on a physically finite planet, is either mad or an economist.

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Kenneth E. Boulding 163
British-American economist 1910–1993

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