NO.PZ2016010801000119
问题如下：
In order to reduce trade deficit in a country, a feasible way is
选项：
A.Increasing its capital account surplus.
B.Decreasing expenditures relative to income.
C.Decreasing domestic saving relative to domestic investment.
解释：
B is correct.
In a country, decreasing a capital account surplus will improve a country trade deficit, which means domestic savings increase relative to domestic investment. Domestic savings increase means decreasing expenditures relative to income. A large capital account surplus (an increase in net foreign borrowing) and a greater trade deficit is consistent with decreasing domestic saving relative to domestic investment.
考点：The Trade Balance
解释：在一个国家，减少资本账户盈余将改善该国的贸易赤字，这意味着国内储蓄相对于国内投资有所增加。所以A错误，B正确。
而国内储蓄的增加意味着支出相对于收入的减少。所以C错误。
巨额资本账户盈余(净外国借款的增加)和更大的贸易逆差，与国内储蓄相对于国内投资的减少是一致的。
老师好，我有两个疑问：
- 原版书第451页写着A trade deficit must be exactly matched by an offsetting captial account surplus. 根据这句话，为什么不能选A？如果贸易赤字和captial account是此消彼长的关系，那么“要减少贸易赤字就要增加capital surplus" 有什么错？
- 这题该用哪个公式去想比较正确？X-M=(S-I)+(T-G)，还是X-M=Y-(C+I+G)？我分不清这两条公式分别适用的场景。
