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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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AVERAGE FACTOR COST

Total factor cost per unit of factor input employed by a firm in the production of output, found by dividing total factor cost by the quantity of factor input. Average factor cost, abbreviated AFC, is generally equal to the factor price. However, using the longer term average factor cost makes it easier to see the connection to related terms, including total factor cost and marginal factor cost.

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GREEN LOGIGUIN
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Today, you are likely to spend a great deal of time watching infomercials hoping to buy either a coffee cup commemorating the moon landing or a how-to book on surfing the Internet. Be on the lookout for mail order catalogs with hidden messages.
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Lewis Carroll, the author of Alice in Wonderland, was the pseudonym of Charles Dodgson, an accomplished mathematician and economist.
"The more you praise and celebrate your life, the more there is in life to celebrate."

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Journal of Public Economics
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