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某小国能够以每单位10的国际价格进口某种产品。这种产品在该国国内的供给曲线为:S=505P,需求曲线为:D=4001 某小国能够以每单位10的国际价格进口某种产品。这种产品在该国国内的供给曲线为:S=50+5P,需求曲线为:D=400-10P。另外,每1单位的产品能够产生价值为10的边际社会收益。 a.试计算对每单位进口产品征收5个单位的关税给社会福利造成的全部影响。 b.计算5个单位的生产补贴给社会福利造成的全部影响。 c.为什么生产补贴产生的社会福利所得比关税多? d.最优生产补贴是多少? A small country can import a good at a world price of 10 per unit.The domestic supply curve of the good is S=50+5P. The demand curve is D=400-10P. In addition,each unit of production yields a marginal social benefit of 10. a.Calculate the total effect on welfare of a tariff of 5 per unit levied on imports. b.Calculate the total effect of a production subsidy of 5 per unit. c.why does the production subsidy produce a greater gain in welfare than the tariff? d.What would the optimal production subsidy be?