系列
keiretsu
Japanese
“Japan's postwar corporate networks grew from the ruins of dissolved wartime empires.”
The two characters in keiretsu have separate careers before joining. 系 (kei) names a thread, a lineage, or a connected series: it appears in words for river system, genealogy, and academic department. 列 (retsu) means row, rank, or ordered sequence: it names a column of soldiers, a train line, a list of feudal domains. Together they describe something like a connected lineup, a set of entities arranged in relation to one another rather than fused into a single body.
Before keiretsu there were zaibatsu, the great family-owned industrial empires that dominated Japan's economy from the Meiji period through 1945. Mitsui, Mitsubishi, Sumitomo, and Yasuda each controlled banks, trading companies, manufacturers, and shipping lines through a holding company at the top. The Allied occupation dissolved the zaibatsu after Japan's defeat in August 1945, breaking apart the holding companies and imposing cross-shareholding restrictions. The intent was to prevent the concentration of economic power that, in the occupation's analysis, had enabled Japanese militarism.
The constituent companies did not disappear. Through the 1950s, former zaibatsu members regrouped around their old main banks, trading houses, and manufacturing partners, now held together by cross-shareholding rather than family ownership. Mitsubishi Bank became the center of what would be called the Mitsubishi keiretsu: a network of dozens of companies that met monthly in a presidents' club, extended preferential credit to member firms, and coordinated supply chains across industries. By 1960, the word keiretsu was in wide use among Japanese economists describing this new structure.
Western business writers discovered keiretsu in the 1980s, when Japan's manufacturing exports were overwhelming American competitors in steel, automobiles, and consumer electronics. James Abegglen and George Stalk's 1985 book Kaisha: The Japanese Corporation gave the structure a rigorous analysis, and the word appeared in American newspapers with increasing frequency after that year. By the early 1990s, critics of Japanese trade policy used keiretsu as shorthand for closed networks that locked out foreign suppliers. The term traveled into MBA curricula, antitrust arguments, and eventually into descriptions of Silicon Valley's own informal networks of investors and startups.
Related Words
Today
In current business usage, keiretsu describes both the surviving postwar Japanese networks and, more loosely, any informal cluster of companies bound by equity stakes, preferential contracts, and recurring business relationships. The Mitsubishi, Mitsui, and Sumitomo networks remain active. Their cross-shareholdings have declined since the banking reforms of the 1990s, but the presidential councils still meet, and old loyalties continue to shape procurement decisions in ways that outside suppliers find difficult to penetrate.
Silicon Valley began adopting keiretsu as a term in the early 2000s, describing the informal networks of angel investors, accelerators, and portfolio companies that route contracts and talent to one another. The analogy is imprecise: the American version lacks the central bank and the century of institutional memory. Still, the word points at something real. A network is not a market.
Explore more words