本文探讨了在自由贸易下，国家电视的进出口情况，解析了消费者剩余、生产者剩余和总剩余的变化。此外，还提供了一道关于棉衬衫关税的练习题，帮助学习者理解贸易对市场的影响。
今日知识点：Analysis of trade
例题
Without trade, PD = $3000, Q = 400; in world markets, PW = $1500
Under free trade, how many TVs will the country import or export?
Identify consumer surplus, producer surplus, and total surplus without trade, and with trade.
解析
Under free trade,
domestic consumers demand 600
domestic producers supply 200
imports = 400
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