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''Price discrimination' is a pricing strategy where identical or largely similar goods or services are transacted at different prices by the same provider in different markets. Price differentiation is distinguished from product differentiation by the more substantial difference in production cost for the differently priced products involved in the latter strategy.〔 Price differentiation essentially relies on the variation in the customers' willingness to pay.〔〔 The term differential pricing is also used to describe the practice of charging different prices to different buyers for the same quality and quantity of a product, but it can also refer to a combination of price differentiation and product differentiation.〔 Other terms used to refer to price discrimination include equity pricing, preferential pricing, and tiered pricing. Within the broader domain of price differentiation, a commonly accepted classification dating to the 1920s is:〔 * Personalized pricing (or first-degree price differentiation) — selling to each customer at a different price; this is also called one-to-one marketing.〔 The optimal incarnation of this is called perfect price discrimination and maximizes the price that each customer is willing to pay,〔 although it is extremely difficult to achieve in practice〔 because a means of determining the precise willingness to pay of each customer has not yet been developed. * Group pricing (or third-degree price differentiation) — dividing the market in segments and charging the same price for everyone in each segment〔 This is essentially a heuristic approximation that simplifies the problem in face of the difficulties with personalized pricing. A typical example is student discounts.〔 * Product versioning〔〔 or simply versioning (or second-degree price differentiation) — offering a product line〔 by creating slightly different products for the purpose of price differentiation,〔 i.e. a ''vertical'' product line. Another name given to versioning is menu pricing.〔 ==Theoretical basis== In a theoretical market with perfect information, perfect substitutes, and no transaction costs or prohibition on secondary exchange (or re-selling) to prevent arbitrage, price discrimination can only be a feature of monopolistic and oligopolistic markets,〔("Price Discrimination and Imperfect Competition", Lars A. Stole)〕 where market power can be exercised. Otherwise, the moment the seller tries to sell the same good at different prices, the buyer at the lower price can arbitrage by selling to the consumer buying at the higher price but with a tiny discount. However, product heterogeneity, market frictions or high fixed costs (which make marginal-cost pricing unsustainable in the long run) can allow for some degree of differential pricing to different consumers, even in fully competitive retail or industrial markets. The effects of price discrimination on social efficiency are unclear. Output can be expanded when price discrimination is very efficient. Even if output remains constant, price discrimination can reduce efficiency by misallocating output among consumers. Price discrimination requires market segmentation and some means to discourage discount customers from becoming resellers and, by extension, competitors. This usually entails using one or more means of preventing any resale: keeping the different price groups separate, making price comparisons difficult, or restricting pricing information. The boundary set up by the marketer to keep segments separate is referred to as a ''rate fence''. Price discrimination is thus very common in services where resale is not possible; an example is student discounts at museums: In theory, students, for their condition as students, may get lower prices than the rest of the population for a certain product or service, and later will not become resellers, since what they received, may only be used or consumed by them. Another example of price discrimination is intellectual property, enforced by law and by technology. In the market for DVDs, laws require DVD players to be designed and produced with hardware or software that prevents inexpensive copying or playing of content purchased legally elsewhere in the world at a lower price. In the US the Digital Millennium Copyright Act has provisions to outlaw circumventing of such devices to protect the enhanced monopoly profits that copyright holders can obtain from price discrimination against higher price market segments. Price discrimination can also be seen where the requirement that goods be identical is relaxed. For example, so-called "premium products" (including relatively simple products, such as cappuccino compared to regular coffee with cream) have a price differential that is not explained by the cost of production. Some economists have argued that this is a form of price discrimination exercised by providing a means for consumers to reveal their willingness to pay. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「price discrimination」の詳細全文を読む スポンサード リンク
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