✔ 最佳答案
Cost of producing 1 TV in USA: 200 / 30 = 6.67 pillows
Cost of producing 1 TV in China: 200 / 18 = 11.11 pillows
What is the same thing:
Cost of producing 1 pillow in USA: 30 / 200 = 0.15 TV
Cost of producing 1 pillow in China: 30 / 200 = 0.09 TV
USA has a comparative advantage in producing TV.
China has a comparative advantage in producing pillows.
USA should export TV and China export pillows.
Trade will benefit if the price of a TV is between 6.67 pillows and 11.11 pillows. Or what is the same thing, the price of a pillow should be between 0.09 TV and 0.15 TV.
If price of TV is higher than 11.11 pillows, China will not buy TVs from USA because she can produce a TV at 11.11 pillows.
It price of TV is lower than 6.67 pillows, USA will not export any TV because it is lower than her cost of production.