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MARKET SHARE: The fraction of an industry's total sales accounted for by a single business. In general, market share is a "first-guess" indicator of a firm's market control. If, for example, a company has a market share of 100 percent (that is, a monopoly), then you can rest assured it has a substantial amount of market control. A company with a 25 percent market share has less, but still notable, market control. In fact, when you get right down to the bottom line, the phrase "market share" is only worth mentioning for oligopolistic firms with a significant degree of market control. There really is no market control for a monopolistically competitive firm with a 0.00000001 percent market share.

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DECREASING MARGINAL RETURNS

In the short-run production of a firm, an increase in the variable input results in a decrease in the marginal product of the variable input. Decreasing marginal returns typically surface after the first few quantities of a variable input are added to a fixed input. This is one of two types of marginal returns. The other is increasing marginal returns. A related phenomenon is diseconomies of scale associated with long-run production.

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Today, you are likely to spend a great deal of time wandering around the downtown area trying to buy either an ink cartridge for your printer or a rechargeable battery for your camera. Be on the lookout for neighborhood pets, especially belligerent parrots.
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John Maynard Keynes was born the same year Karl Marx died.
"It is the mark of an educated mind to be able to entertain a thought without accepting it."

-- Aristotle

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