The demand function for beer is given below, where p is the retail price and  D(p)  is the demand in gallons per capita. For the demand function, find the elasticity of demand E(p) for any price p. [Note: You will find that demand is inelastic. This means that taxation, which acts like a price increase, is an ineffective way of discouraging liquor consumption, but is an effective way of raising revenue.] D(p) = 6.913p−0.142

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