8 Suppose that in a year an American worker can produce 100 shirts or 20 computers and a Chinese worker can produce 100 shirts or 10 computers.

a For each country, graph the production possibil ities frontier. Suppose that without trade the workers in each country spend half their time producing each good. Identify this point in your graphs.

b If these countries were open to trade, which country would export shirts? Give a specific numerical example and show it on your graphs. Which country would benefit from trade? Explain.

c Explain at what price of computers (in terms of shirts) the two countries might trade.

d Suppose that China catches up with American productivity so that a Chinese worker can produce 100 shirts or 20 computers in a year. What pattern of trade would you predict now? How does this advance in Chinese productivity affect the economic wellbeing of the two countries' citizens?