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Price discrimination is the strategic selling in which the seller sells the same product at different prices to customers.
Price discrimination can be done only in monopoly because a monopolist is a single seller in the market and it can have a full control over the price of the product that it sells. Thus, giving monopolist a liberty to sell its product at different prices as a consumer cannot go to a different seller for that particular product. While in other markets such as monopolistic, perfect competition sellers, oligopoly, etc. there are more than single seller, no one has a full control over the prices.
Thereby, customers can shift to a different seller if one seller tries to differ its prices for the same product. Thus, we can say that a competition in the market helps to keep varying prices or price discrimination in check.
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