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The model of monopolistic competition can characterize the market for plumbing services in a city. This market is initially in long-run equilibrium, but there is an increase in demand for plumbing services. We expect that in the long run:A. New firms will enter the plumbing marketB. There will be a short-run increase in the number of firms, but then the number will return to its original level.C. Firms will shut down, but they will not leave the industryD. Firms will leave the plumbing market
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