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YELLOW-DOG CONTRACT: An agreement signed by workers before they are hired, stipulating that they would not join a union after they are hired. This contract was commonly used by firms in the late 1800s and early 1900s to limit labor union membership and thus to prevent unions from exerting control over the labor market. Yellow-dog contracts were outlawed by the Norris-LaGuardia Act in 1932.

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MARGINAL REVENUE CURVE, PERFECT COMPETITION

A curve that graphically represents the relation between the marginal revenue received by a perfectly competitive firm for selling its output and the quantity of output sold. Because a perfectly competitive firm is a price taker and faces a horizontal demand curve, its marginal revenue curve is also horizontal and coincides with its average revenue (and demand) curve. A perfectly competitive firm maximizes profit by producing the quantity of output found at the intersection of the marginal revenue curve and marginal cost curve.

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Today, you are likely to spend a great deal of time flipping through the yellow pages hoping to buy either a remote controlled train set or a genuine down-filled snow parka. Be on the lookout for telephone calls from former employers.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"If we all did the things we are capable of doing, we would literally astound ourselves."

-- Thomas Edison

WLLN
Weak Law of Large Numbers
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