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October 15, 2026 

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DATA: Real world observations that are used to test or verify hypotheses. This is the key to the process of acquiring knowledge about the world using the scientific method. While theoretical speculation might indicate what we "think" the world is like, we don't know for sure until we compare our hypothesized view with the real world itself. Data is what adds empirical to empirical economic analysis.

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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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PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time wandering around the shopping mall trying 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 crowded shopping malls.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"Give the American people a good cause, and there's nothing they can't lick. "

-- John Wayne, actor

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Analysis of Variance
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