Two-part tariff

A two-part tariff (TPT) is a price discrimination technique in which the price of a product or service is composed of two parts - a lump-sum fee as well as a per-unit charge. In general, price discrimination techniques only occur in partially or fully monopolistic markets. It is designed to enable the firm to capture more consumer surplus than it otherwise would in a non-discriminating pricing environment. Two-part tariffs may also exist in competitive markets when consumers are uncertain about their ultimate demand. Health club consumers, for example, may be uncertain about their level of future commitment to an exercise regimen.

Depending on the homogeneity of demand, the lump-sum fee charged varies, but the rational firm will set the per unit charge above or equal to the marginal cost of production, and below or equal to the price the firm would charge in a perfect monopoly. Under competition the per-unit price is set below marginal cost.

An important element to remember concerning two-part tariffs is that it is still price discrimination, of which an important feature is that the product or service offered by the firm must be identical to all consumers, hence, price charged may vary, but not due to different costs borne by the firm, as this would imply a differentiated product. Thus, while credit cards which charge an annual fee plus a per-transaction fee is a good example of a two-part tariff, a fixed fee charged by a car rental company in addition to a per-kilometre fuel fee is not so good, because the fixed fee may reflect fixed costs such as registration and insurance which the firm must recoup in this manner. This can make the identification of two-part tariffs difficult.

When consumers have homogeneous demand, any one consumer is representative of the market (the market being n identical consumers). For purposes of demonstration, consider just one consumer who interacts with one firm which experiences fixed costs and constant costs per unit - hence the horizontal marginal cost (MC) line.

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