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MARGINAL FACTOR COST CURVE, PERFECT COMPETITION: A curve that graphically represents the relation between marginal factor cost incurred by a perfectly competitive firm for hiring an input and the quantity of input employed. A profit-maximizing perfectly competitive firm hires the quantity of input found at the intersection of the marginal factor cost curve and marginal revenue product curve. The marginal factor cost curve for a perfectly competitive firm with no market control is horizontal.

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FOUR-FIRM CONCENTRATION RATIO

The proportion of total output in an industry produced by the four largest firms in an industry. This is one of two common concentration ratios. The other is the eight-firm concentration ratio. Another related measure is the Herfindahl index. The four-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control held by the four largest firms in the industry.

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Today, you are likely to spend a great deal of time at an auction trying to buy either a stretchable, flexible watch band or high-gloss photo paper that works with your printer. Be on the lookout for broken fingernail clippers.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
"When one door closes another door opens; but we do often look so long and so regretfully upon the closed door, that we do not see the ones which open for us. "

-- Alexander Graham Bell, inventor

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