Society as Quesnay sees it consists of three classes: the productive class of agriculturists; the sterile class containing all those who are active outside the sphere of agriculture--industry, commerce, and the liberal professions; and lastly the class of landowners, including the Sovereign and the collectors of tithes. The national aggregate product materialises in the hands of the productive class as an aggregate of provisions and raw materials to the value of some 5,000 million livres. Of this sum, 2,000 millions represent the annual working capital of agriculture, 1,000 millions represent the annual wear and tear of fixed capital, and 2,000 millions are the net revenue accruing to the landowners. Apart from this total produce, the agriculturists, here conceived quite in capitalist terms as tenant farmers, have 2,000 million livres cash in hand. Circulation now takes place in such a way that the tenant class pay the landowners 2,000 millions cash as rent (as the cost of the previous period of production). For this money the landowning class buy provisions from the tenants for 1,000 millions and industrial products from the sterile class for the remaining 1,000 millions. The tenants in their turn buy industrial products for the 1,000 millions handed back to them, whereupon the sterile class buy agricultural products for the 2,000 millions they have in hand: for 1,000 millions raw materials etc., to replace their annual working capital, and provisions for the remaining 1,000 millions. Thus the money has in the end returned to its starting point, the tenant class; the product is distributed among all classes so that consumption is ensured for everyone; at the same time the means of production of the sterile as well as of the productive class have been renewed and the landowning class has received its revenue. The prerequisites of reproduction are all present, the conditions of circulation have all been fulfilled, and reproduction can start again on its regular course.[61]