The change in the quantity of total physical 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 physical product by the change in the variable input. Marginal physical product, which more often goes by the name marginal product (MP), is one of two measures derived from total physical product. The other is average physical product.

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Few pedestrians would argue that the Republic of Northwest Queoldiola is anything but a quaint and courteous country. The Northwest Queoldiolans have a cute habit of wearing those little hats with the squirrel tail hanging from the back. They also manufacture the best sundials that money can buy. As a tourist mecca, there's nothing quainter or more courteous than the Republic of Northwest Queoldiola. But, as you may have noticed during our pedestrian trek, several Queoldiolans have decided to pursue permanent residence, and presumably U. S. citizenship, right here Shady Valley. They have undertaken the age old process of immigration. BUT WHY SHADY VALLEY? These Queoldiolans have some pretty darn peculiar habits. While we're all found of sundials, they've raise fondness to a religious fervor. Their clothing is, to put it mildly, pretty darn peculiar. The worst part of it -- they're willing to work cheap!
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Today, you are likely to spend a great deal of time surfing the Internet wanting to buy either a wall poster commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki or decorative garden figurines. Be on the lookout for slightly overweight pizza delivery guys.
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This isn't me! What am I?

-- Victor Borge, musician, humorist

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