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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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PRICE CEILING

A legally established maximum price that is imposed on a market BELOW the price that otherwise would be achieved in equilibrium. A price ceiling is placed on a market with the goal of keeping the price low, presumably based on the notion that the equilibrium price is too high. If imposed on a competitive market free of market failures, a price ceiling creates a shortage, or excess demand.

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Today, you are likely to spend a great deal of time searching for a specialty store wanting to buy either throw pillows for your bed or a package of blank rewritable CDs. Be on the lookout for pencil sharpeners with an attitude.
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The average bank teller loses about $250 every year.
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