A pricing system by which customers pay more per unit for their purchases up to some given quantity, with a lower price per unit for further purchases. Such a system is only practicable when the customer can be identified, and resale is difficult. The argument for two-part tariffs is that the higher price for the first n units bought reflects the overhead costs of supplying a particular customer: for example, gas, electricity, and water suppliers incur costs in connection to the mains, however much or little is then bought. Critics of two-part tariffs argue that the higher charge for the first n units is simply a form of monopolistic price discrimination, to skim off some of the customer's consumer surplus. They also point out that a two-part tariff results in higher average prices being charged to poorer customers, who usually buy less than richer ones.

• Council Tax
• counter party
• counter-party credit risk
• counter-trade
• countervailing duty
• countervailing power
• counting, double
• coupon
• Cournot competition
• Cournot duopoly
• covariance
• cover
• covered, times
• CPI
• crash, stock market
• crawling peg exchange rates
• creation, trade
• creative accounting
• creative destruction
• credibility
• credible threat
• credit
• credit card
• credit control
• credit creation