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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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MARKET EQUILIBRIUM

The state of equilibrium that exists when the opposing market forces of demand and supply achieve a balance with no inherent tendency for change. Once achieved, a market equilibrium persists unless or until it is disrupted by an outside force, especially the demand and supply determinants. A market equilibrium is indicated by equilibrium price and equilibrium quantity.

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Today, you are likely to spend a great deal of time surfing the Internet trying to buy either a wall poster commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki or decorative garden figurines. Be on the lookout for pencil sharpeners with an attitude.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
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