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June 18, 2026 

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PERFECT COMPETITION, LONG-RUN ADJUSTMENT: A perfectly competitive industry undertakes a two-part adjustment to equilibrium in the long run. One is the adjustment of each perfectly competitive firm to the appropriate factory size that maximizes long-run profit. The other is the entry of firms into the industry or exit of firms out of the industry, to eliminate economic profit or economic loss. The end result of this long-run adjustment is a multi-faceted equilibrium condition that price is equal to marginal cost and average cost (both short run and long run).

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DATA

Observations or measurements that quantify or otherwise identify some aspect of the real world. Data are used to track economic performance, quantify economic characteristics, and test economic hypotheses. Data collection is often the most challenging part of undertaking an empirical analysis.

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APLS

PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time driving to a factory outlet seeking to buy either a wall poster commemorating next Thursday or a pair of gray heavy duty boot socks. Be on the lookout for crowded shopping malls.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"We must be willing to let go of the life we have planned, so as to have the life that is waiting for us. "

-- E. M. Forster, writer

BPEA
Brookings Papers on Economic Activity
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