Which of the following is a reason other than concentration that price-cost margins may vary across industries?

Question

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Accounting practices, regulation, product differentiation, and the nature of sales transactions can all affect price-cost margins across industries. For example, regulation may increase costs for firms in some industries and reduce competition, leading to higher price-cost margins. Accounting practices may also vary across industries, affecting the measurement of costs and profits. Finally, product differentiation and the nature of sales transactions may affect firms' pricing power and ability to extract rents, leading to differences in price-cost margins.

Which of the Following Is a Reason Other Than Concentration