This paper discusses that the sustainable trade credit and inventory policy, with demand related to credit period and consumer environment sensitivity, under the carbon cap-and-trade regulation and tax regulation. And the firms make efforts to reduce the carbon emissions. The optimal credit period, order quantity and the carbon emission level of retailers can be obtained. Keywords: inventory policy; trade credit; carbon emission reduction investment. 2 ( ) 0 Z CQ Q − < , the enterprise carbon

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... issions are more than the carbon cap. Thus, the enterprise can buy the