Note: there was no fully correct answer to the Sandwichman's quiz, 200 Years, 200 Dollars! An anonymous commenter came tantalizingly close but missed on a technicality. The Adam Smith quote was correct but the Karl Marx quote was not a passage from Capital, which is what the question asked for. Below is the passage from Capital:
THE SO-CALLED LABOUR-FUND
It has been shown in the course of this inquiry that capital is not a fixed magnitude, but is a part of social wealth, elastic and constantly fluctuating with the division of fresh surplus-value into revenue and additional capital. It has been seen further that, even with a given magnitude of functioning capital, the labour-power, the science, and the land (by which are to be understood, economically, all conditions of labour furnished by Nature independently of man), embodied in it, form elastic powers of capital, allowing it, within certain limits, a field of action independent of its own magnitude. In this inquiry we have neglected all effects of the process of circulation, effects which may produce very different degrees of efficiency in the same mass of capital. And as we pre-supposed the limits set by capitalist production, that is to say, pre-supposed the process of social production in a form developed by purely spontaneous growth, we neglected any more rational combination, directly and systematically practicable with the means of production, and the mass of labour-power at present disposable. Classical economy always loved to conceive social capital as a fixed magnitude of a fixed degree of efficiency. But this prejudice was first established as a dogma by the arch-Philistine, Jeremy Bentham, that insipid, pedantic, leather-tongued oracle of the ordinary bourgeois intelligence of the 19th century. Bentham is among philosophers what Martin Tupper is among poets. Both could only have been manufactured in England. In the light of his dogma the commonest phenomena of the process of production, as, e.g., its sudden expansions and contractions, nay, even accumulation itself, become perfectly inconceivable. The dogma was used by Bentham himself, as well as by Malthus, James Mill, MacCulloch, etc., for an apologetic purpose, and especially in order to represent one part of capital, namely, variable capital, or that part convertible into labour-power, as a fixed magnitude. The material of variable capital, i.e., the mass of the means of subsistence it represents for the labourer, or the so-called labour-fund, was fabled as a separate part of social wealth, fixed by natural laws and unchangeable. To set in motion the part of social wealth which is to function as constant capital, or, to express it in a material form, as means of production, a definite mass of living labour is required. This mass is given technologically. But neither is the number of labourers required to render fluid this mass of labour-power given (it changes with the degree of exploitation of the individual labour-power), nor is the price of this labour-power given, but only its minimum limit, which is moreover very variable. The facts that lie at the bottom of this dogma are these: on the one hand, the labourer has no right to interfere in the division of social wealth into means of enjoyment for the non-labourer and means of production. On the other hand, only in favourable and exception al cases, has he the power to enlarge the so-called labour-fund at the expense of the "revenue" of the wealthy.
What silly tautology results from the attempt to represent the capitalistic limits of the labour-fund as its natural and social limits may be seen, e.g., in Professor Fawcett. "The circulating capital of a country," he says, "is its wage-fund. Hence, if we desire to calculate the average money wages received by each labourer, we have simply to divide the amount of this capital by the number of the labouring population." That is to say, we first add together the individual wages actually paid, and then we affirm that the sum thus obtained, forms the total value of the "labour-fund" determined and vouchsafed to us by God and Nature. Lastly, we divide the sum thus obtained by the number of labourers to find out again how much may come to each on the average. An uncommonly knowing dodge this. It did not prevent Mr. Fawcett saying in the same breath: "The aggregate wealth which is annually saved in England, is divided into two portions; one portion is employed as capital to maintain our industry, and the other portion is exported to foreign countries... Only a portion, and perhaps, not a large portion of the wealth which is annually saved in this country, is invested in our own industry."
The greater part of the yearly accruing surplus-product, embezzled, because abstracted without return of an equivalent, from the English labourer, is thus used as capital, not in England, but in foreign countries. But with the additional capital thus exported, a part of the "labour-fund" invented by God and Bentham is also exported.