1.
a) At Equilibrium Pd will be same as Ps and Qs will be same as Qd
So 50- 3Q= 14 + 1.5Q
Or 4.5Q= 36, Or Q = 36/4.5 = 8 units
Price will be 50- 3*8 = 50-24 = $26
b) At Pd = 0, 50- 3Qd= 0, or Qd = 50/3 which is equivalent to 17 units
Quantity supplied at Ps = 0 or 14 + 1.5Qs= 0, Qs= -14/1.5 which is equivalent to -10
Interpretation: Sellers will not sell product at Price = 0, because they have fixed cost which will not recover at price = 0
c)$20 is a Price Celing at it is the maximum price set by governemnt at which product could be sold.
d) At Price = $20,
Qd= (50-20)/3= 10, Qs= (20-14)/1.5= 4
e) Such Government intervention will increase demand of good and decrease supply of good as price set is below equilibrium price. As calculated in point d), supply of good will be 6 units lesser than demand of good(4 units supply in comparision to 10 units demand)
f) Yes, black market is possible for this good. Seller could charge higher price than controlled price illegally as demand of good is more than supply of good at current price.
2.
a) Total Revenue function is 6Q (Price into total units sold)
b) Total Cost function will be 90 + 3Q (Fixed cost +Quantity X PEr unit Variable Cost)
c) Profit Function is TR-TC which will be 6Q - 90 - 3Q = 3Q-90
d) At Breakeven, Proit Function will be equal to 0
Or 3Q-90 = 0, Or Q =30. Hence the company will breakeven by selling 30 units
e) At Breakeven, TR= 6X30= 180, TC= 90 + 3*30= 180. Hence, both are same.
3. Demand Function or Price = 107- 2Q
TC= 200+ 3Q
a) Total Revenue = Price X Quantity = 107Q - 2Q^2
b) Profit function is TR - TC, OR 107Q - 2Q^2 - 200 - 3Q Or 104Q- 2Q^2 - 200
c) For Profit =0, 104Q - 2Q^2 - 200 = 0 Or 2Q^2 - 104Q + 200 = 0
Or Q^2 -52Q + 100 = 0
Or (Q-2)(Q-50)= 0
Or Q= 2 Or Q=50
Thanks
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