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LERNER INDEX: The difference between price (p) and marginal cost (mc) as a fraction of price, that is [p-mc]/p. The Lerner index is usually taken as an indicator of market power because the larger the index, the larger the difference between price and marginal cost, that is, the larger the distance between the price and the competitive price. The Lerner index depends on the elasticity of demand. The Lerner index is also called the price-cost margin.

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IMPLICIT COLLUSION

Seemingly independent, but parallel, actions among competing firms (mostly oligopolistic firms) in an industry designed to control the market, raise the price, and otherwise act like a monopoly. Also termed tacit collusion, the distinguishing feature of implicit collusion is the lack of any explicit agreement. This is one of two types of collusion. The other is explicit or overt collusion, which involves an explicit agreement.

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Today, you are likely to spend a great deal of time driving to a factory outlet wanting to buy either a T-shirt commemorating yesterday or a pair of handcrafted oven mitts. Be on the lookout for crowded shopping malls.
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