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Juku industry generates about $ 12 billion a year ...

„Compared to the Japanese juku industry that generates about $ 12 billion a year, the institutionalized German Nachhilfe system with its estimated more than 4,000 Nachhilfe schools is in an early stage of development.“

Steve Entrich, „Effects of investments in out-of-school education in Germany and Japan“ in de Gruyter, „Contemporary Japan“, 2014, 26(1), S. 77