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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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CLOSED ECONOMY

An economy that does not engage in international trade or other forms of interaction with other countries. That is, a closed economy neither exports goods and services to, nor imports goods and services from, other economies that make up its foreign sector. It is "closed" to the flow of goods and services into or out of the country. The alternative to a closed economy is an open economy, one that does engage in international trade.

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PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time flipping through the yellow pages seeking to buy either a combination CD player, clock radio, and telephone (with answering machine) or a revolving spice rack. Be on the lookout for the happiest person in the room.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
"Now is the only time there is. Make your now wow, your minutes miracles, and your days pay. Your life will have been magnificently lived and invested, and when you die you will have made a difference."

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Weak Law of Large Numbers
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