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LONG-RUN EQUILIBRIUM CONDITIONS: The long-run equilibrium of perfectly competitive industry generates six specific equilibrium conditions, including (1) economic efficiency (P = MC), (2) profit maximization (MR = MC), (3) perfect competition (MR = AR = P), (4) breakeven output (P = AR = ATC), (5) minimum production cost (MC = ATC), and (6) minimum efficient scale (MC = ATC = LRAC = LRMC).

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FOUR-FIRM CONCENTRATION RATIO

The proportion of total output in an industry produced by the four largest firms in an industry. This is one of two common concentration ratios. The other is the eight-firm concentration ratio. Another related measure is the Herfindahl index. The four-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control held by the four largest firms in the industry.

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BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time surfing the Internet seeking to buy either a remote controlled ceiling fan or a how-to book on home decorating. Be on the lookout for door-to-door salesmen.
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Paper money used by the Commonwealth of Massachusetts prior to the U.S. Revolutionary War, which was issued against the dictates of Britain, was designed by patriot and silversmith, Paul Revere.
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Marginal Utility
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