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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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AVERAGE-MARGINAL RELATION

A mathematical connection between a marginal value and the corresponding average value stating that the change in the average value depends on a comparison between the average and the marginal. This mathematical relation between average and marginal surfaces throughout the study of economics, especially production (average product and marginal product), cost (average total cost and marginal cost), and revenue (average revenue and marginal revenue). A similar relation is that between a total value and the corresponding marginal value.

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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway hoping to buy either a small, foam rubber football or an instructional DVD on learning to the play the oboe. Be on the lookout for the happiest person in the room.
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Two and a half gallons of oil are needed to produce one automobile tire.
"Whenever you fall, pick up something. "

-- Oswald Avery, scientist

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