(First Question)
(i)
(A) Demand equation: Q = a - bP
Using table,
120 = a - 12b.......(1)
40 = a - 20b.......(2)
(1) - (2) gives
8b = 80
b = 10
a = 40 + 20b [from (2)] = 40 + 20 x 10 = 40 + 200 = 240
Demand: Q = 240 - 10P
(B) Supply equation: Q = c + dP
Using table,
20 = c + 12d.........(3)
140 = c + 20d.........(4)
(4) - (3) gives
8d = 120
d = 15
c = 20 - 12d [from (30] = 20 - 12 x 15 = 20 - 180 = - 160
Supply: Q = - 160 + 15P
(ii)
Setting demand = supply
240 - 10P = - 160 + 15P
25P = 400
P = 16
Q = 240 - 10 x 16 = 240 - 160 = 80
(iii)
Using demand equation: Elasticity of demand (Ed) = (dQ/dP) x (P/Q) = - 10 x (16/80) = - 2
Using supply equation: Elasticity of supply (Es) = (dQ/dP) x (P/Q) = 15 x (16/80) = 3
(iv)
After tax, new supply curve is:
Q = - 160 + 15 x (P - 3) = - 160 + 15P - 45 = - 205 + 15P
Setting demand = new supply,
240 - 10P = - 205 + 15P
25P = 445
P = 17.8 (price paid by buyers)
Price received by sellers = 17.8 - 3 = 14.8
Q = 240 - 10 x 17.8 = 240 - 178 = 62
Tax burden of buyers = price paid by buyers - pre-tax price = 17.8 - 16 = 1.8
Tax burden of sellers = 3 - 1.8 = 1.2
Since absolute value of Ed is lower than the value of Es (2 < 3), tax burden of buyers is less than that of sellers.
NOTE: As HOMEWORKLIB's Policy, 1st question is answered.
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