Intermediate Microeconomics · 免费预览
利润的几何结构与供给逻辑
在产量空间中，利润是收入直线与成本曲线之间的垂直距离；在斜率相等处利润达到最大。价格上升时，最优点沿边际成本曲线向上移动；供给曲线则是边际成本高于平均可变成本的部分。
1. The gap picture
The gap picture
2. Price changes slide the optimum
Price changes slide the optimum
3. The shutdown question
The shutdown question
4. Revealed profitability
Revealed profitability
5. The geometry of the optimum
In output space, where is profit maximized?
6. The supply slide
In the worked example the price rises from 10 to 12. What does the firm do?
7. The shutdown rule
When does a short-run profit maximizer produce zero output?
8. Revealed profitability tests
What does a revealed-profitability violation look like?
9. Supply at the higher price
For the worked technology, compute optimal output y star when p equals 12, and write the number.
10. The supply slope
The worked supply is y equals p over 4. Compute the output change when p rises by 4, and write the number.
11. Supply at a high price
The worked supply is y equals p over 4. What output does a price of 20 call forth?
12. This firm never shuts down
For this technology, average variable cost is wy and marginal cost is 2wy. Why does the firm never shut down at a positive price?
13. Testing a candidate
The firm is observed using input 4 when the price is 10 and the wage 2. Is it maximizing profit?
14. The price falls back
Price falls from 12 to 8 on this supply curve. What is the output change?
15. Supply at twenty
For the supply y equals p over 4, compute output at p of 20, and write the number.
16. Revenue at the higher price
At p of 12 the firm supplies 3 units. Compute total revenue, and write the number.