Economists, as well as courts dealing with antitrust cases, often use which concept to measure whether a firm has monopoly power in supplying a good or service in the given market?

Question

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Cross-price elasticity of demand is used to measure how the quantity demanded of one good changes in response to a price change of another good, which can indicate the level of competition and potential monopoly power in a market.

Economists, as Well as Courts Dealing with Antitrust Cases, Often