Hence a harmony of the large, medium and small incomes may be considered the indispensable condition of the economic prosperity of a people.[205-1] This prosperity is best secured when the medium-class income prevails, when no citizen is so rich that he can buy the others, and no one so poor that he might be compelled to sell himself. (_J. J. Rousseau._)[205-2] Where there is not a numerous class of citizens who have time enough to serve the state even gratis, as jurymen, overseers of the poor, municipal officers, representatives of the people etc. (compare § 63), and property enough to be independent of the whims and caprices of others, and to maintain themselves and the state in times of need, even the most excellent of constitutions must remain a dead letter. Nor should there be an entire absence of large fortunes, and even of inherited large fortunes. The changes of ministry which accompany constitutional government are fully possible only when the choice of men who would not lose their social position by a cessation of their salaries as public functionaries is not altogether too limited.[205-3] Thus the transaction of the most important political business, especially that which relates to foreign affairs, requires a peculiar elasticity of mind, and a capacity for routine on the grandest scale, which with very rare exceptions, can be acquired only by habituation to them from childhood, and which are lost as soon as the care for food is felt. The bird's-eye-view of those who are born "great" does not, by any means, embrace the whole truth of human things, but it does a very important side of it. Among this class, as a rule, it is easiest to find great party leaders, while leaders who have to be paid by their party, generally become in the long run, mere party tools.[205-4] It is true that it requires great intellectual and moral power to resist the temptations which a brilliant hereditary condition presents; temptations especially to idleness, to pride and debauchery. For ordinary men, it is a moral and, in the end, an economic blessing, that they have to eat their bread in the sweat of their brow,[205-5] and that they can grow rich only by long-continued frugality.[205-6] However, the distribution of the national income, and every change in that same distribution, constitute one of the most important but at the same time one of the most obscure departments of statistics.[205-7] When inequality increases because the lower classes absolutely decline, there is no use in talking any longer about the prosperity of the nation.[205-8] It is different, of course, when only the higher classes become, relatively speaking, higher yet. But even this latter kind of inequality may operate disastrously, inasmuch as it nourishes the most dangerous tendency of democracy, that of envy towards those who are better off. [Footnote 205-1: _Verri_ Meditazioni, VI.]