Consider firms operating in an industry where the own price elasticity of demand is infinite; that is,  EQ,P = -?. Use this information to determine the type of industry in which these firms operate and the optimal advertising-to-sales ratio.

A. Monopolistic industry and 0
B. Perfectly competitive industry and 0
C. Perfectly competitive industry and ?
D. Monopolistically competitive industry and ?


Answer: B

Economics

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