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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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AGGREGATE DEMAND CURVE

A graphical representation of the relation between aggregate expenditures on real production and the price level, holding all ceteris paribus aggregate demand determinants constant. The aggregate demand (AD) curve is one side of the graphical presentation of the aggregate market. The other side is occupied by the long-run aggregate supply curve and/or the short-run aggregate supply curve. The negative slope of the aggregate demand curve captures the inverse relation between aggregate expenditures on real production and the price level. This negative slope is attributable to the interest-rate, real-balance, and net-export effects.

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Today, you are likely to spend a great deal of time watching infomercials hoping to buy either a travel case for you toothbrush or a looseleaf notebook binder. Be on the lookout for door-to-door salesmen.
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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
"Whatever course you decide upon, there is always someone to tell you that you are wrong. There are always difficulties arising which tempt you to believe that your critics are right. To map out a course of action and follow it to an end requires...courage."

-- Ralph Waldo Emerson

IIP
Index of Industrial Production
A PEDestrian's Guide
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