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In page Africa–China economic relations:

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In the Republic of Congo, Chinese contracts are said to be 30% cheaper than Western ones. African workers, however complain of worsening conditions: Chinese firms hire them on a day-to-day basis, with lower wages than they received from Westerner firms, are insulting or even racist, and enforce strict working conditions.[2] African businessmen have long complained of an increase in Chinese businesses, especially in Senegal.[citation needed] Some Angolans had complained that along with the shipment of machinery and cement, China also imports many of its own nationals to work on these reconstruction projects, leaving little employment for locals, and not allowing for cooperative working relations or the transfer of knowledge and skills.[3]