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PERFECT COMPETITION AND SHORT-RUN SUPPLY CURVE: A perfectly competitive firm's supply curve is that portion of its' marginal cost curve that lies above the minimum of the average variable cost curve. A perfectly competitive firm maximizes profit by producing the quantity of output that equates price and marginal cost. As such, the firm moves along it's marginal cost curve in response to alternative prices. Because the marginal cost curve is positively sloped due to the law of diminishing marginal returns, the firm's supply curve is also positively sloped.

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DEMAND INCREASE AND SUPPLY DECREASE

A simultaneous increase in the willingness and ability of buyers to purchase a good at the existing price, illustrated by a rightward shift of the demand curve, and a decrease in the willingness and ability of sellers to sell a good at the existing price, illustrated by a leftward shift of the supply curve. When combined, both shifts result in an indeterminant change in equilibrium quantity and an increase in equilibrium price.

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Today, you are likely to spend a great deal of time at a crowded estate auction hoping to buy either a hepa filter for your furnace or a wall poster commemorating next Thursday. Be on the lookout for door-to-door salesmen.
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The portion of aggregate output U.S. citizens pay in taxes (30%) is less than the other six leading industrialized nations -- Britain, Canada, France, Germany, Italy, or Japan.
"Whenever an individual or a business decides that success has been attained, progress stops. "

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