Just need help with this set of questions. Thank you.

Intra Industry Trade
1.
Cost
TC= F+c.QC
c=100, F =50,000
TC=50,000 +100.QC
MC = ∂TC/∂QC = 100
AVC = TC/QC= 50,000/QC+100
Therefore average cost (AVC) is 50,000/QC+100 and marginal cost(MC) is 100
2.
P = Pc- = P(Qd)
Qdc = 50,000[1/n-0.001* P(Qd)]
Qdc /50,000= 1/n-0.001* P(Qd)
0.001* P(Qd) = 1/n- Qdc /50,000
P(Qd) = 1000[1/n- Qdc /50,000]
Total Revenue (TR) = P*Q
TR = 1000 [Qdc /n- Qd2c /50,000]
Marginal Revenue (MR) =∂ TR/∂ Qdc
MR = 1000 [1/n- 2Qdc /50,000]
MR = 1000[1/n-0.00004 Qdc]
MR = 1000/n -0.04 Qdc
3.
4.
MR = MC
1000/n -0.04 Qdc = 100
1000/n -0.04 *0 = 100
1000/n = 100
n = 1000/100
n =10
In absence of trade there will be 10 firms.
5.
After trade the equilibrium price will increase from P to P1 and Quantity also increases from Q to Q1
6. Gains from trade can be measured by measuring the profit of a firm before and after trade, and find change in profit before and after trade. If the change in profit before and after trade is positive then we can say that there are gains from trade and if it is negative then we can say that...