社會階層
Social stratification in Japan became pronounced during the Yayoi period. Expanding trade and agriculture increased the wealth of society, which was increasingly monopolized by social elites. By 600 AD, a class structure had developed which included court aristocrats, the families of local magnates, commoners, and slaves. Over 90% were commoners, who included farmers, merchants, and artisans. During the late Heian period, the governing elite consisted of three classes. The traditional aristocracy shared power with Buddhist monks and samurai, though the latter became increasingly dominant in the Kamakura and Muromachi periods. These periods witnessed the rise of the merchant class, which diversified into a greater variety of specialized occupations.