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S-I MODEL: A model used to identify equilibrium in Keynesian economics based on injections (investment, I) and leakages (saving, S) for the two basic sectors (household and business). Equilibrium is achieved at the intersection of the saving line, S, and the investment line, I.

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MARGINAL REVENUE PRODUCT CURVE

A curve that graphically illustrates the relation between marginal revenue product and the quantity of the variable input, holding all other inputs fixed. This curve indicates the incremental change in total revenue for incremental changes in the variable input. The marginal revenue product curve plays a key role in marginal productivity theory and the economic analysis of factor markets.

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Today, you are likely to spend a great deal of time at a crowded estate auction trying to buy either storage boxes for your income tax returns or an AC adapter for your CD player. Be on the lookout for door-to-door salesmen.
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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
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