2024-11-22

ECON 4007 笔记

（没听课，我也不知道这个是干嘛的… 反正先记着）

Suppose firm 2’s production level is $q_2$, what $q_1$ maximizes firm 1’s profit in the current period?

$$ma{x}_{q_1}{q}_1(1-q_1-q_2)$$ $$q_1=\frac{1-q_2}{2}$$

Maximized profit

$$\pi =\frac{(1-q_2{)}^2}{4}$$

Since $P=1-Q$, $Q=q_1+q_2$, $c_1=c_2=0$

$maxQ(1-Q)⟹Q^m=\frac{1}{2},{\pi }^m=\frac{1}{4},q_1=q_2=\frac{1}{3}$

It implies that $(q_1^c,q_2^c)=\left(\frac{1}{4},\frac{1}{4}\right)$ can be achieved as an equilibrium outcome through trigger strategies as long as $\delta \ge \frac{9}{17}$

Green and Porter

There is a testable prediction that price wars should happen after negative demand shocks that could not have been predicted by firms.

GELH 2001

1. Multiple Choice (30 points)
2. Fill in the Blanks (20 points)
3. Compare and Contrast (20 points)
4. Essay (30 points)

Make sure to write something (even it’s wrong)

Fill in the blanks

• Theogony
• Genesis
• Metamorphoses
• Paradise Lost

Compare and Contrast

Only select one among two.

The expected length of your response per question is FOUR sentences ONLY.

Essay

The essay would about the film Barbie.

Keys:

• Know the names of the important characters

You could stand out if you are different. Don’t keep on saying the same things. Try to say something new.