Assuming that country A is a small country of automobile import trade, the demand and supply of automobiles are: D = 4000–0.04 P; S = 2400 + 0.06 P;
If the price of the car in the international market is $10,000, please explain by calculation:
(1) Under free trade, the production and import volume of automobiles in country A, and the impact of trade on the welfare of domestic consumers and manufacturers.
(2) If country A sets a quota limit of 200 units on the import of automobiles, what are the prices, production and trade volume of domestic automobiles?
(3) Compared with free trade, what changes have taken place in the welfare of consumers, government and manufacturers in Country A after the implementation of quota measures?