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ARC ELASTICITY: The average elasticity for discrete changes in two variables, A and B. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of the initial and ending values of each variable, rather than only initial values. Arc elasticity is generally calculated using the midpoint formula. Arc elasticity should be compared with point elasticity. For infinitesimally small changes in variables A and B, arc elasticity is the same as point elasticity.

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PERFECT COMPETITION, LONG-RUN EQUILIBRIUM CONDITIONS

The long-run equilibrium of a 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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