Intermediate Microeconomics · 免费预览

角点解与折点预算约束

当切点方程没有合理解时,最优解位于边界;当商品互为替代品或存在饱和时会出现角点解;而在配给、数量折扣或代金券的情况下,预算约束本身也可能出现折点,使微积分分析转移到折点附近。

1. The boundary optimum

The boundary optimum

2. Another corner worked

Another corner worked

3. Budgets that kink

Budgets that kink

4. Why economists watch boundaries

Why economists watch boundaries

5. Diagnosing the corner

For u equal to 2 x1 plus x2 with income 20 and prices 1 and 1, why is the optimum (20, 0)?

6. The linear substitution check

For u equal to 3 x1 plus x2, income 30, prices 2 and 1, what does substituting the budget into utility show?

7. Where the voucher bends

A 12-dollar voucher usable only on good 1, with income 30 and prices 1 and 1, creates what budget?

8. The candidate list on a kinked budget

What is the complete list of candidates when optimizing on a kinked budget with smooth convex preferences?

9. A corner's utility

For u equal to 3 x1 plus x2 with income 30 and prices 2 and 1, compute the optimal utility, and write the number.

10. The other corner for comparison

Same consumer, compute the utility of spending all 30 on good 2, and write the number.

11. The winning corner in units

For u of 3 x1 plus x2 with income 30 and prices 2 and 1, what is the optimal x1?

12. The voucher's kink coordinates

With income 30, prices 1 and 1, and a 12-dollar voucher for good one, where does the budget kink?

13. Cobb-Douglas on a voucher budget

For u of x1 x2 on the voucher budget, income 30 cash plus the 12-dollar voucher, where is the optimum?

14. The corner's signature

At the corner optimum (20, 0) for u of 2 x1 plus x2 with equal prices, what does the MRS of 2 against the price ratio of 1 tell you?

15. Utility on the voucher budget

For u of x1 x2 with income 30 plus the 12-dollar voucher, compute the utility at the optimum, and write the number.

16. All-in on the voucher good

For u of 3 x1 plus x2 with income 30 plus the 12-dollar voucher and equal prices, compute the optimal utility, and write the number.

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