World price = $7
Domestic demand at world price (during free trade)
= 10*(P)^(-0.5)
= 10*(7)^(-0.5)
= 10*(0.37796)
= 3.7796 = 4 (approx.)
to get Consumer Surplus, integrate the equation of demand curve and substitute the values
consumer surplus =
= 20*(7)^0.5 = 52.915
Domestic Supply at world price (during free trade)
= 5*P^(0.5)
=5*(7)^(0.5)
= 5*(2.64575)
=13.2288 = 13 (approx)
to get producer Surplus, integrate the equation of supply curve and substitute the values
Producer Surplus =
= 5*[(7)^1.5]/1.5 = 61.7342
total welfare = Consumer Surplus + producer surplus
= 52.915 + 61.7342 = 114.6492
when free trade is eliminated
equilibrium price will be
Domestic Supply = Domestic Demand
5*(P)^(0.5) = 10*P^(-0.5)
P^(0.5+0.5) = 10/5
P = 2
Equilibrium Quantity in the case of elimination of free trade
Q = 5*(2)^(0.5)
= 7.071 = 7 (approx)
Consumer surplus when free trade is eliminated
consumer surplus =
= 20*2^0.5 = 28.2843
Producer surplus when free trade is eliminated
Producer Surplus =
= 5*[(2)^1.5]/1.5 = 9.4281
total welfare = consumer surplus + producer surplus
= 28.2843 + 9.4281 = 37.7124
Change in consumer surplus by eliminating free trade
= 28.2843 - 52.915 = -24.6307
consumer surplus is declined by 24.6307 units due to eliminating free trade
Change in producer surplus by eliminating free trade
= 9.4281 - 61.7342 = -52.3061
producer surplus is declined by 52.3061 units due to eliminating free trade
Change in total welfare by eliminating free trade
= 37.7124 - 114.6492 = -76.9368
Total Welfare is declined by 76.9368 units due to elimination of free trade
The change in consumer surplus from eliminating free trade is $ 24.63
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