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SOCIAL SCIENCE: The scientific study of society--of human behavior and of social interactions. Several social sciences are economics, sociology, political science, and anthropology. Economics is considered a social science because it seeks to explain how society deals with the scarcity problem.

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MARGINAL REVENUE, MONOPOLISTIC COMPETITION

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a monopolistically competitive firm receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a monopolistically competitive firm equates marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time at a dollar discount store hoping to buy either a tall storage cabinet with five shelves and a secure lock or a birthday greeting card for your grandmother. Be on the lookout for slow moving vehicles with darkened windows.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
"You don't have to see the top of the staircase to take the first step.¾ "

-- Martin Luther King, civil rights leader

PIH
Permanent Income Hypothesis
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