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In page Belgian Congo:
The mobilization of the African work force in the capitalist colonial economy played a crucial role in spreading the use of money in the Belgian Congo. The basic idea was that the development of the Congo had to be borne not by the Belgian taxpayers but by the Congolese themselves. The colonial state needed to be able to levy taxes in money on the Congolese, so it was important that they could make money by selling their produce or their labour within the framework of the colonial economy.