“The first problem I propose to tackle is this: how much of its income should a nation save? To answer this a simple rule is obtained valid under conditions of surprising generality; the rule, which will be further elucidated later, runs as follows.
The rate of saving multiplied by the marginal utility of money should always be equal to the amount by which the total net rate of enjoyment of utility falls short of the maximum possible rate of enjoyment.”

—  Frank P. Ramsey

"A Mathematical Theory of Saving", The Economic Journal, Vol. 38, No. 152 (Dec., 1928)

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Frank P. Ramsey10
British mathematician, philosopher 1903–1930

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