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SALES TAX: A tax on retail sales. This is major source of revenue for many state and local governments. Because poorer people tend to spend a larger share of their income on stuff covered by sales taxes, it tends to be a regressive tax. To reduce this regressiveness, some state and local governments excluded items like food and medicine.

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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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BEIGE MUNDORTLE
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Today, you are likely to spend a great deal of time browsing about a thrift store hoping to buy either a box of multi-colored, plastic paper clips or several orange mixing bowls. Be on the lookout for telephone calls from former employers.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
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