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TOTAL-MARGINAL RULE: A mathematical connection between a marginal value is the slope of a curve of the corresponding total value stating that the marginal IS the slope of the total curve. If the total curve has a positive slope (that is, is upward sloping), then marginal is positive. If the total product has a negative slope (downward sloping), then marginal is negative. If the total curve has a zero slope (horizontal), then marginal is zero. Moreover, if the total curve has an increasing slope (becoming steeper), then the marginal is rising. If the total curve has a decreasing slope (becoming flatter), then the marginal is falling.

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TERMS OF TRADE

The rate at which goods are traded, either between individuals or between nations. It is the quantity of one good exchanged per unit of another good. The terms of trade is essentially the price. But the price is stated in terms of the quantity of another good. Like any market price, the terms of trade is based on what the buyers are willing to pay and what the sellers are willing to accept. The terms of trade between any two countries is based on the relative opportunity cost in each country.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors wanting 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 deranged pelicans.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
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