求助！几个宏观基础的练习题！

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老师推荐了一个外国网站上的quiz，只有答案，没有结束，让人很头痛啊~我就先把问题简单化了哈

1.  consumption: $70
     government purchase: $20
     net taxes:   $25
     investment: $15
     imports:  $5
     exports:  $20
     求 a. the value of household saving ?                b.  the value of government saving?

2.Last year in the country of  ABC, government purchases of goods and sevices were $20, and the government had a budget deficit of $3. Consumption expenditure was $7,and there was dissaving of $2. 求 GDP in ABC was?
这道题我用收入法能算出来，但是支出法就算不出来了

3. The country og XYZ has zero net exports. Government purchases of goods and services are $5 and the government has a budget surplus of $5. Investment is $5.求Saving in XYZ is ?


4. If the government has a budget deficit and saving is equal to investment, then

aggregate expenditure does not equal aggregate income
imports equal exports
imports are less than exports
imports exceed exports


5. Tom graduates from university and cannot find a job in his field , so he takes a job mouing lawns 3 days a week. Tom is discourged because he cannot find a job that uses his university degree. Tom is counted as a. employed    b. employed   c.discouraged worker

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关键词：宏观基础 练习题 consumption expenditure Discouraged 求助 基础 练习题

我觉得
1.a 20+15+20-5-25=25
b.25-20=5
2.只能用收入法？20-3+7-2=22
3.S=5+5=10
4.imports are less than exports C+S=C+(G-T)+I+NX   , S=I
5.discouraged worker 是不积极找工作的失业者，所以employed

imports exceed exports
y= C+I+G+X , y= C+S+T+M
G+X = T+M
budget deficit ---> G>T
so, X-M<0