From XIe of the feudal companies develop in Europe according to a pyramidal diagram, the inhabitants are under the dependence of the lord. One improves the way of cultivating the ground as a practitioner the rotation of crops, the collar of shoulder allows the horses to draw a load five times higher than before, the agricultural tools (plow with iron plowshare) are of better quality. The extension of cultivable surfaces and the best work of the ground make it possible to obtain increased productions, nourished better the men are more numerous and live longer.
As of XIIe, the big cities offer favorable conditions to the exchanges. The tradesmen and the craftsmen gather, a new class is created: middle-class of the cities. The construction of a network of road facilitates the revival of the trade in Europe and the creation of fairs which trade between Europe and the East.
In XIIIe the first universities are created in Europe. One teaches there theology, the right, medicine, the arithmetic one, etc