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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It's time for another one of our frequent stops at Mr. Market Super Food Discount Store, this time to check out the story behind retail prices. As consumers, we spend a large fraction of our nonworking, nonsleeping lives wandering grocery stores aisles, searching clothing store racks, and surveying department store displays for the right product at the right price. How do we know, like the name of the long-running game show, if "The Price is Right?" How are retail prices set and do they really tell us the value of a product?
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Today, you are likely to spend a great deal of time at the confiscated property police auction looking to buy either car battery jumper cables or a dozen high trajectory optic orange golf balls. Be on the lookout for door-to-door salesmen.
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