With the support of foreign capital, the mines and the mining finance houses, largely dominated by English-speaking South Africans, prospered under the system of apartheid and shunned outright opposition. In return for the continued monopsony of labour purchase for the mines that kept wages low and outlawed trade unions, the English-speaking mining companies tolerated job reservation that prevented blacks from developing skills. This is debated, however, as policies to restrict labour supply to whites only resulted in higher miner wages than under a system of equal employment.