Why is it the case in a long-run monopolistically competitive equilibrium that the firm's demand curve is

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Why is it the case in a long-run monopolistically competitive equilibrium that the firm's demand curve is tangent to its average cost curve? Why could it not be a long-run equilibrium if the demand curve "cut through" the average cost curve?
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Microeconomics

ISBN: 978-0073375854

2nd edition

Authors: Douglas Bernheim, Michael Whinston

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