Za (guilds)

It was not until the Muromachi period (1336–1467) that the za really came to be a significant presence in Japan's economic world. By this time, many more za had appeared, and were larger, more organized, and more well-connected with temples, shrines, and nobles. While many associated themselves with temples and shrines, many other guilds allied themselves with noble families, gaining protection in exchange for a sharing of the profits. For example, Kyoto's yeast-brewers were associated with the Kitano Tenman-gū shrine, and the oil brokers had the Tendai monastery of Enryakuji as their patron. The gold leaf makers of Kyoto placed themselves under the protection of the Konoe family, and the fishmongers under the Saionji, a particularly powerful and wealthy family, who earned two-thirds of the profits of Kyoto's fish markets from the arrangement.

During this period, agricultural and economic advancement and growth was quite rapid in the countryside, or "Home Provinces", and za began to conglomerate into groups organized by their locality, not by their trade. These rural za were generally associations of wealthier peasant farmers who combined to sell oil, bamboo, rice, or other agricultural products in bulk; they occasionally allowed urban brokers to join their guilds, to act as their proxy or guide in the city markets. However, in the large cities, where economic progress was occurring in a different way, za formed up, as might be expected, by trade, and began to concentrate themselves in small sections of the city. Ginza, meaning "silver za" (silver trade guild), in Tokyo, is one of the most famous place-names to reflect this activity, though the Guildhall area of London, on the other side of the world, is a perfect example of the equivalent English activity.

Towards the end of the Muromachi period, the za began to grow independent of the noble families, temples, and shrines they had placed themselves under, having grown large enough and powerful enough to protect themselves. This independence also allowed the za to further its own interests, namely profit; the za began to realize at this time that they had the power to alter market prices, and began to show signs of monopolistic activity. While most used their monopoly power only in retail sales of their particular trade good to consumers, some, such as the salt dealers of Yamato Province, would purchase raw materials wholesale, entering arrangements by which they could deny other guilds and other merchants of these materials.

Though mostly independent from their former patrons, many guilds still engaged in agreements for protection with noble families on a one-time, rather than permanent, basis. However, their independence and increasing power earned many za political enemies; some from their former patrons. As the Muromachi period came to an end, in the late 15th century, other forms of economic associations arose which were less monopolistic, and which challenged the supremacy of the za.

The Ōnin War of 1467 plunged the country into a period of chaos and war, called the Sengoku period, which would last over 130 years. However, the za continued to operate, and perhaps became even more powerful as the ability to safely travel and transport goods across the nation became increasingly scarce.

Towards the end of the 16th century, one hundred years into the Sengoku period, Oda Nobunaga briefly took command of the country, and established "free" markets and guilds, known respectively as rakuichi (楽市) and rakuza (楽座). These dealt a severe blow to the power and influence of the older, monopolistic za, but did not replace them. Several other types of trade associations came into being around this time as well; though it could be argued that they replaced the za, it seems more likely that the change was a more gradual, organic one, and that the za could be said to have continued to exist, just in new forms and with new names. One of the new types of organization was called nakama (仲間), or kabunakama (株仲間) when they were authorized by the shōgun. These groups were essentially guilds based on the idea of shareholding; each member of the guild owned a share in the total profits of all the guild's members. However, the shares were not transmissible, unlike in our modern stock market. Another type of trade group, called toiya (or ton'ya in Edo), served as wholesale merchants, focusing primarily on shipping and warehousing. At this time, Osaka came into its own as a great port, and eclipsed Kyoto as the nation's primary center of trade, contributing further to the downfall of the original za.

By the end of the Tokugawa period, the guilds, in these various forms, had gained a significant degree of legitimacy and power. In exchange for monopoly licenses and government support in other forms, the guilds shared a portion of the profits with the government. Employing a strongly centralized system, the za brought 90% of the nation's silk processing to Kyoto by the 1720s. This centralization made monopolization of the industry far easier, and brought a significant wealth to the Kyoto government and to the merchant members of the various trade organizations.

Over the course of the 18th and 19th centuries, the trade guilds and associations, in all their various forms, changed over into more modern, and eventually Western, modes of business, giving rise to the zaibatsu and keiretsu monopolies of the 20th century. Some guilds were replaced, eclipsed, or destroyed. Others simply changed, gradually or rapidly, adopting new methods and modes of acting in the market, as technology and the general economic structure of the country changed.