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
Without trade,
CS = A
PS = B + C
Total surplus = A + B + C
With trade,
CS = A + B + D
PS = C
Total surplus = A + B + C + D
下面我们为大家准备了一道同类型的题目，请大家一起来试试解答。
Question: Tariff on Cotton Shirts
PW = $20
Tariff: T = $10/shirt
Under free trade, how many cotton shirts will the country import or export?
Identify consumer surplus, producer surplus, and total surplus without trade, and with trade.
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正确答案及解析：
Consumers must pay $30 for an imported shirt. So, domestic producers can charge $30 per shirt.
In general, the price facing domestic buyers & sellers equals (PW + T).
