Why did handicraft workshops appear at a different time from manual workshops? One is14th century and the other is15th century?

There is no detailed difference in the history textbooks of senior two. 1415th century, capitalism sprouted in Venice, Florence and Holland in northwest Europe. Wealthy handicraft workshop owners are divided into craftsmen. Handmade workshops are family-based, small in scale and scattered. With the development of capitalism, the merchant class appeared. Businessmen provide raw materials and buy products to small producers of household handicrafts, and become package buyers and capitalists themselves. Contract buyer capitalists gather scattered small producers to form a capitalist handicraft factory with centralized production. Handicraft factories further improve labor productivity, which is the preparatory stage for the transition from handicraft production to capitalist big machine production. Handicraft factories are relatively large and concentrated.