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DEMAND SHOCK: A disruption of market equilibrium (that is, a market adjustment) caused by a change in a demand determinant and a shift of the demand curve. A demand shock can take one of two forms--an Demand Increase or a Demand Decrease. An increase in demand is seen as a rightward shift of the demand curve and results in an increase in equilibrium quantity and an increase in equilibrium price. A decrease in demand is a leftward shift of the demand curve and results in a decrease in equilibrium quantity and a decrease in equilibrium price.

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MARGINAL PRODUCTIVITY THEORY

A theory used to analyze the profit-maximizing quantity of inputs (that is, the services of factor of productions) purchased by a firm in the production of output. Marginal-productivity theory indicates that the demand for a factor of production is based on the marginal product of the factor. In particular, a firm is generally willing to pay a higher price for an input that is more productive and contributes more to output. The demand for an input is thus best termed a derived demand.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius wanting to buy either a key chain with a built-in flashlight and panic button or a green and yellow striped sweater vest. Be on the lookout for malfunctioning pocket calculators.
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The average bank teller loses about $250 every year.
"A stumble may prevent a fall. "

-- Margaret Thatcher, British prime minister

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