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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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INTERCEPT, INVESTMENT LINE

The intercept of the investment line indicates autonomous investment, investment that does not depend on the level of income or production. This can be thought of as investment that the business sector undertakes regardless of the state of the economy. Autonomous investment is affected by the investment expenditures determinants, which cause a change in the intercept and a shift of the investment line.

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Today, you are likely to spend a great deal of time searching for a specialty store looking to buy either a how-to book on home remodeling or a tall storage cabinet with five shelves and a secure lock. Be on the lookout for malfunctioning pocket calculators.
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The first paper currency used in North America was pasteboard playing cards "temporarily" authorized as money by the colonial governor of French Canada, awaiting "real money" from France.
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