“An economic system is not a linear system, and… this fact stands in the way of the determination of the parameters of the system by methods that presume linearity, and… it introduces great difficulties in the extrapolation from past behaviour for purposes of prediction.”

—  Arnold Tustin

Source: The Mechanism of Economic Systems (1953), p. ix

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Arnold Tustin photo
Arnold Tustin 18
British engineer 1899–1994

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