There is little need for marketing in the place such as a subsistence farm, because ______. The modern capitalism economy could

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问题 There is little need for marketing in the place such as a subsistence farm, because ______.
The modern capitalism economy could be well developed where ______.

选项 A、interregional trade is substantial
B、people produce the same or similar goods
C、systems of transportation are slowly improved
D、customers can buy goods directly