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Composite quasirent.
Indeed, in some cases and for some purposes, nearly the whole income of a business may be regarded as a quasi-rent, that is an income determined for the time by the state of the market for its wares, with but little reference to the cost of preparing for their work the various things and persons engaged in it. In other words it is a composite quasi-rent divisible among the different persons in the business by bargaining, supplemented by custom and by notions of fairness … Thus the head clerk in a business has an acquaintance with men and things, the use of which he could in some cases sell at a high price to rival firms. But in other cases it is of a kind to be of no value save to the business in which he already is; and then his departure would perhaps injure it by several times the value of his salary, while probably he could not get half that salary elsewhere.
(Marshall 1961, VI.viii.35.)
Alfred Marshall (1842-1924)