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MARGINAL REVENUE, PERFECT COMPETITION: The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a perfectly 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 perfectly competitive firm equates marginal revenue and marginal cost.

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PUBLIC CHOICE

The study of collective decisions made by groups of individuals, especially those decisions made by government organizations. As the name suggests, public choice is primarily the study of how choices (decisions) are made by the public (government) sector. Such choices are made, in principle, on behalf of the public or all members of society, to correct market failures or imperfections in the private sector. However, in that the world is imperfect on all fronts, the government sector also comes up short in many cases, with inefficient imperfections due to election seeking politicians, ignorant and abstaining voters, special interest groups, and government bureaucracies.

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Today, you are likely to spend a great deal of time wandering around the shopping mall trying to buy either storage boxes for your winter clothes or several magazines on time travel. Be on the lookout for small children selling products door-to-door.
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