(1) Equation of linear demand curve: QD = a - bP
Elasticity = (dQD/dP) x (P/QD) = -b x [P / (a - bP)] = -0.3
-b x [3 / (a - 3b)] = -0.3
b / (a - 3b) = 1
b = a - 3b
4b = a
Also, when P = 3, QD = 2.6 (billion)
2.6 = a - 3b
2.6 = 4b - 3b
b = 2.6
a = 4 x 2.6 = 10.4
Linear demand curve: QD = 10.40 - 2.60P
(2) New supply function: QS(New) = 0.9 x QS(Old)
QS(New) = 0.9 x (2 + 0.2P)
QS(New) = 1.8 + 0.18P
Equating with QD,
10.4 - 2.6P = 1.8 + 0.18P
2.78P = 8.6
P = 3.09
Q = 10.4 - (2.6 x 3.09) = 10.4 - 8.03 = 2.37 (billion pounds)
The supply of coffee is Qs 2.0+0.2P, where quantity is in billions of pounds and price...
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