Certainly, economic and psychological factors were alike operative in producing the three revolutions. The most general economic force was the change from "natural economy" to "money economy," _i.e._ from a society in which payments were made chiefly by exchange of goods, and by services, to one in which money was both the agent of exchange and standard of value. In the Middle Ages production had been largely co-operative; the land belonged to the village and was apportioned out to each husbandman to till, or to all in common for pasture. Manufacture and commerce were organized by the gild--a society of equals, with the same course of labor and the same reward for each, and with no distinction save that founded on seniority--apprentice, workman, master-workman. But {5} in the later Middle Ages, and more rapidly at their close, this system broke down under the necessity for larger capital in production and the possibility of supplying it by the increase of wealth and of banking technique that made possible investment, rapid turn-over of capital, and corporate partnership. The increase of wealth and the changed mode of its production has been in large part the cause of three developments which in their turn became causes of revolution: the rise of the bourgeoisie, of nationalism, and of individualism. [Sidenote: The bourgeoisie] Just as the nobles were wearing away in civil strife and were seeing their castles shot to pieces by cannon, just as the clergy were wasting in supine indolence and were riddled by the mockery of humanists, there arose a new class, eager and able to take the helm of civilization, the moneyed men of city and of trade. _Nouveaux riches_ as they were, they had an appetite for pleasure and for ostentation unsurpassed by any, a love for the world and an impatience of the meek and lowly church, with her ideal of poverty and of chastity. In their luxurious and leisured homes they sheltered the arts that made life richer and the philosophy, or religion, that gave them a good conscience in the work they loved. Both Renaissance and Reformation were dwellers in the cities and in the marts of commerce. [Sidenote: National states] It was partly the rise of the third estate, but partly also cultural factors, such as the perfecting of the modern tongues, that made the national state one of the characteristic products of modern times. Commerce needs order and strong government; the men who paid the piper called the tune; police and professional soldiery made the state, once so racked by feudal wars, peaceful at home and dreaded abroad. If the consequence of this was an increase in royal power, the kings were among those who had greatness thrust upon them, rather than achieving it for themselves. {6} They were but the symbols of the new, proudly conscious nation, and the police commissioners of the large bankers and traders. [Sidenote: Individualism]