A国和B国有两种生产要素：资本和劳动，用于生产两种产品X和Y。两国的技术水平一样，X是资本密集产品，A国是资本

充裕的国家。分析下列情形中，两国贸易条件和福利的变化：

a．A国的资本存量增加。

b．A国的劳动供给增加。

c．B国的资本存量增加。

d．B国的劳动供给增加。

Countries A and B have two factors of production，capital and labor，with which they produce two goods，X and Y Technology is the same in the two countries．X is capital intensive：A is capital abundant．

Analyze the effects on the terms of trade and the welfare 0f the two countries of the following：

a．An increase in A's capital stock．

b．An increase in A's labor supply．

c．An increase in B's capital stock．

d．An increase in B's labor supply．