“It might be argued that only the ‘rich’ can afford to be capitalists, i.e., those who have a greater amount of money stock. This argument has superficial plausibility, since … for any given individual and a given time-preference schedule, a greater money stock will lead to a greater supply of savings, and a lesser money stock to a lesser supply of savings…. We cannot, however, assume that a man with (post-income) assets of 10,000 ounces of gold will necessarily save more than a man with 100 ounces of gold. We cannot compare time preferences interpersonally, any more than we can formulate interpersonal laws for any other type of utilities. What we can assert as an economic law for one person we cannot assert in comparing two or more persons. Each person has his own time-preference schedule, apart from the specific size of his monetary stock. Each person’s time-preference schedule, as with any other element in his value scale, is entirely of his own making. All of us have heard of the proverbially thrifty French peasant, compared with the rich playboy who is always running into debt. The common-sense observation that it is generally the rich who save more may be an interesting historical judgment, but it furnishes us with no scientific economic law whatever, and the purpose of economic science is to furnish us with such laws. As long as a person has any money at all, and he must have some money if he participates in the market society to any extent, he can be a capitalist.

—Murray Rothbard, Man, Economy, and State