What are the Dorfman^Steiner conditions for optimal advertising? If the advertising-to-sales ratio is currently 1/10, the elasticity

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What are the Dorfman^Steiner conditions for optimal advertising? If the advertising-to-sales ratio is currently 1/10, the elasticity of advertising 0.2 and price elasticity 2:0, what are the consequences for the advertising-to-sales ratio if the price elasticity of demand is 1?

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