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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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KEYNESIAN CROSS

A diagram illustrating the basic Keynesian theory of macroeconomics, with aggregate expenditures measured on the vertical axis and aggregate production measured on the horizontal axis, with the relation between aggregate expenditures and aggregate production represented by a positively-sloped aggregate expenditures line. The "cross" aspect of this diagram is the intersection between the aggregate expenditures line and a 45-degree line indicating every point of equality between aggregate expenditures and aggregate production. The "Keynesian" aspect of this diagram is derived from John Maynard Keynes, the developer and namesake of Keynesian economics.

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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers looking to buy either one of those memory foam pillows or a remote controlled train set. Be on the lookout for slightly overweight pizza delivery guys.
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Two and a half gallons of oil are needed to produce one automobile tire.
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