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consider a competitive market in which firms distribute products that are imported. Assume that the cost of the imports represent 50% of both the marginal costs and average costs of the firms. Assume that the market is initially in long-run equilibrium and that the price of the products sold is $10,000. The exchange rage depreciates, increasing the costs of the imports by10%. How much will the price increase in the long-run? Will firms changes size? Will the change in the number of firms producing be related to the elasticity of demand? Show that the short- run price increases will be lower than the long-run price increase and will depend on the elasticities ( or slope) of both of the marginal cost curves of the firms.

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关键词：elasticities competitive equilibrium Increasing elasticity 国外

我不知道我的理解是否正确，试试看

完全竞争厂商的长期均衡条件P=AR=MR=LMC=SMC=LAC=SAC且利润为零

由题意进口成本最初为10000*1/2=5000，贬值后为5000*（1+0.1）=5500

然后再次均衡时变为P=LAC=10500,价格上涨500，公司将会缩小生产规模，生产数量的改变与需求价格弹性相关，

如弹性较大，生产数量将减少较大，如弹性较小，生产数量将减少较小。