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简介：Second, merchants are all profit-seeking. In order to prevent the merchants from becoming obsessed with their own interests and the phenomenon of Shanxi merchants betraying the country again, the court should strictly control the names and quantities of goods traded, and strictly review the qualifications of merchants participating in the transaction, but there are certain oversteps. , immediately deal with it. In this way, Zhangjiakou's trade was completely under the control of the imperial court, which could be relaxed or closed.