The big international manufacturers had realized this and adopted an oligarchic strategy: as well as making it difficult for others to obtain the raw materials, they were very careful not to reveal any of their manufacturing know-how.
國際大廠也看準這點，採取「多頭寡佔」策略，原料取得困難不說，機器設備的 Know-how 也絕不輕易外洩。