3.  An increase in thereal wage leads to

            a.  an increase in labor supply due to thesubstitution effect but a decrease due to the income effect;*

            b.  a decrease in labor supply due to thesubstitution effect but an increase due to the income effect;

            c.  increases in labor supply due to thesubstitution and income effects;

            d.  decreases in labor supply due to thesubstitution and income effects;

            e.  an increase in the price level.

这道题答案是A。

后面三道题答案分别得A,A,C 有大神了分析一下问什么，第一道题就是两个同时考虑后面只考虑一个了。

6.  Marylin can workas much as 40 weeks per year at a take-home wage of $2,000 per week.  She also has non-wage income equal to $10,000per year.  A decrease in her non-wage income will cause Erica to

• work     more due to the income effect;
  
• work     more due to the substitution effect;
  
• work     less due to the income effect;
  
• work     less due to the substitution effect;
  
• no     change his work effort.
  

7.  An decrease in herwage will cause Marylin to

• work     more due to the income effect;
  
• work     more due to the substitution effect;
  
• work     less due to the income effect;
  
• work     less due to the substitution effect;
  
• no     change her work effort.
  

8.  Bob currentlytakes home $80,000 per year after taxes. He expects to receive $20,000 after taxes when he retires in 20years.  Over this period he could earn200% on any money he invested in the company pension plan.  An increase in his rate of return will causeHan to

• save     more due to the income effect;
  
• save     less due to the income effect;
  
• save     more due to the substitution effect;
  
• save     less due to the substitution effect;
  
• a. and     d.