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MARGINAL PHYSICAL PRODUCT: The change in the quantity of total product resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal physical product, usually abbreviated MPP, is found by dividing the change in total product by the change in the variable input. Marginal physical product usually goes by the shorter name marginal product.

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SLOPE, INVESTMENT LINE

The positive slope of the investment line is also termed the marginal propensity to invest (MPI). This slope is greater than zero but less than one, reflecting induced investment. The slope of the investment line affects the slope of the aggregate expenditures line and thus also affects the magnitude of the multiplier process.

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Today, you are likely to spend a great deal of time looking for a downtown retail store seeking to buy either a T-shirt commemorating the first day of spring or a coffee cup commemorating last Friday (you know why). Be on the lookout for small children selling products door-to-door.
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Lombard Street is London's equivalent of New York's Wall Street.
"In every man's life there lies latent energy. There is, however, a spark that, if kindled, will set the whole being afire, and he will become a human dynamo, capable of accomplishing almost anything to which he aspires. "

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