[討論] 獨占市場開放與完全競爭市場貿易？
政大題目如下：
Suppose in a country, there is one firm in an industry. suppose also
there is infinite number of firms producing the same good in the rest
of world. What is the possible impact on welfare when the country
opening up to trade?
(a) There will be no deadweight loss in the country
(b) The deadweight loss still exists but smaller under trade.
(c) the deadweight loss is larger under trade.
(d) the producer surplus is larger under trade.
思考之後我選擇(A) ，因為開放貿易，廠商就會面臨到完全競爭市場的成本優勢
而把價格調整成P=MC.
不過有同學反應說是(B)
說獨占市場不會完全變成完全競爭市場。
有大大可以幫忙解惑嗎？ 感謝
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