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MARGINAL PROPENSITY TO SAVE: The proportion of each additional dollar of household income that is used for saving. Or alternatively, this is the change in saving due to a change in disposable income. Abbreviated MPS, the marginal propensity to save is the slope of the saving or propensity-to-save line. It also takes center stage for the multiplier effect. In particular, the inverse of the MPS is the simple expenditure multiplier. The sum of the marginal propensity to save and the related concept, the marginal propensity to consume, is equal to one.

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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 going out of business sale looking to buy either a handcrafted bird feeder or a New York Yankees baseball cap. Be on the lookout for strangers with large satchels of used undergarments.
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Two and a half gallons of oil are needed to produce one automobile tire.
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