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Suppose that rather than the declining demand assumed in Example 28. a decrease in the cost of copper production causes the s
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Answer #1

New supply is 40% more than original supply which means Q + 0.4Q or (-9 + 9P)*1.4.

This becomes Q = -12.6 + 12.6P

Demand is Q = 27 - 3P

New price is found at Qd = Qs

27 - 3P = -12.6 + 12.6P

39.6 = 15.6P

P = 2.54

Hence price is decreased from $3 to $2.54, which means price is reduced by $0.46.

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