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December 12, 2025 

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SIGNALLING: The use of low-cost, easy to obtain information about a product or commodity to indicate the quality of a product. Signalling occurs when buyers use features of a commodity or actions by the seller to indicate overall product quality. These signals can be either intended or unintended.

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MARGINAL REVENUE

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a 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 firm equates marginal revenue and marginal cost.

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WHITE GULLIBON
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Today, you are likely to spend a great deal of time at a garage sale seeking to buy either one of those "hang in there" kitty cat posters or a velvet painting of Elvis Presley. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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This isn't me! What am I?

The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
"Defeat is simply a signal to press onward."

-- Helen Keller, lecturer, author

WLLN
Weak Law of Large Numbers
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