To be sure, the cost of managing capital and of “formal” financial intermediation (that is, the investment advice and portfolio management services provided by a bank or official financial institution or real estate agency or managing partner) is obviously taken into account and deducted from the income on capital in calculating the average rate of return (as presented here). But this is not the case with “informal” financial intermediation: every investor spends time—in some cases a lot of time—managing his own portfolio and affairs and determining which investments are likely to be the most
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