Justin Blake,1960.Jacob Morris on Unproductive Employment:A
Criticism. Science and Society: 24,pp.171,173.
Jacob Morris,1958. Unemployment and Unproductive Employment,
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Joseph Gillman,1965. Prosperity in Crisis,New York,pp.23;Jacob
Morris,1958.Unemployment andUnproductive Employment,Science and Soci-
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万分感谢!