In which industry structure is advertising and sales promotion likely to be most important?

Question

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Monopolistic competition is where there are many firms producing differentiated products that are close substitutes. In this industry, firms will rely heavily on advertising and sales promotion to differentiate themselves from their competitors and attract customers to their specific product. Perfect competition has many small firms selling homogeneous products, so advertising is not as necessary, and in a monopoly or oligopoly, there may be little competition, so the need for advertising may be lower.

In Which Industry Structure Is Advertising and Sales Promotion Likely