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a) According to Professor Becker, In the short run (1 year) every 10% hike in the price of cigarettes will reduce consumption by only 4%.
So, Price Elasticity in the short run = Percentage change in Quantity demanded / Percentage change in price
Price Elasticity = -4% / 10%
So Price Elasticity = -0.4
In order to reduce the quantity demanded by 15%, the price need to rise by :
-0.4 = -15% / Percentage change in Price
Percentage change in Price = -15 / -0.4
= 37.5%
Thus in One Year, the price of cigarettes has to increase by 37.5% in order to reduce the smoking by 15%.
b) In the long run, every 10% hike in the price of cigarettes will reduce consumption by about 7%.
So, Price Elasticity = -7% / 10%
Price Elasticity = -0.7
In order to reduce the quantity demanded by 15%, the price need to rise by :
-0.7 = -15% / Percentage change in Price
Percentage change in Price = -15 / -0.7
= 21.4%
Thus in Three Years, the price of cigarettes has to increase by 21.4% in order to reduce the smoking by 15%.