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ABSTRACTION METHODS: Abstraction is the process of simplifying the complexities of the real world by ignoring (hopefully) unimportant details, especially (for our purposes) while doing economic analysis. Three common methods of actual, real world abstraction used in economic theories are words, graphs, and equations. Words can be misunderstood. Graphs are a little more precise. And equations tend to be the most precise of the three.

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MARGINAL REVENUE PRODUCT

The change in total revenue resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal revenue product, usually abbreviated MRP, is found by dividing the change in total revenue by the change in the variable input or by multiplying marginal physical product by marginal revenue. This is also termed value of the marginal product. Marginal revenue product is a key concept for understanding the demand for productive inputs.

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Today, you are likely to spend a great deal of time surfing the Internet looking to buy either a T-shirt commemorating the 2000 Presidential election or a really, really exciting, action-filled video game. Be on the lookout for the last item on a shelf.
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The average length of a "business lunch" is about 36 minutes.
"People of mediocre ability sometimes achieve outstanding success because they don't know when to quit. Most men succeed because they are determined to. "

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