zaikai
Collectively, the powerful and influential businesspeople and tycoons of Japan.
Behind the trading company and the bank are the financially interconnected companies known as zaikai, many of which descended from pre-war zaibatsu oligopolists. The modern zaikai has remained every bit as strong as its zaibatsu predecessors, achieving this result by linking companies (through interlocking directorships and equity by participation) whose operations comprehend most of the major areas of Japanese industrial activity.
Where it comes from
Borrowed from Japanese 財界 (zaikai, “world of money”), from 財 (zai, “money; wealth”) + 界 (kai, “world”).
Adapted from the Wiktionary entry zaikai (CC BY-SA 4.0).