Yet profits rise and fall for reasons which have nothing to do with managerial effort, such as the health of the economy.
然而，利润会因为经济体健康等与管理努力毫不相干的种种原因而上升和下降。
The value of a professional manager is determined by managerial potential, investor's marginal effort, and minimum of marginal earnings.
职业经理人价值大小取决于经理人的个人潜能、投资者边际努力程度以及最低边际收益值。
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