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CARTEL: A formal agreement between businesses in the same industry, usually on an international scale, to get market control, raise the market price, and otherwise act like a monopoly. A cartel tends to be unstable because the artificially high prices it sets gives each member of the cartel an incentive to "cheat" with a slightly lower price. When only one member of the cartel lowers the price, it can make oodles of profit by taking customers away from the other members. If they all cheat, the cartel falls apart. While cartels damage efficiency, they're power is often short-lived because of this cheating. Like collusion and other techniques of market control, cartels are illegal in the United States.

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ARC ELASTICITY

The average elasticity for discrete changes in two variables. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of initial and ending values of each variable, rather than initial values. Arc elasticity is generally calculated using the midpoint elasticity formula. The contrast to arc elasticity is point elasticity. For infinitesimally small changes in two variables, arc elasticity is the same as point elasticity.

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