In the new long-run equilibrium, there would be an increase in the number of suppliers of t-shirts.
What would happen when the demand for plan white t-shirts increase?
A perfect competition is when there are many buyers and sellers of homogenous goods and services. Market prices are set by the forces of demand and supply.
When demand for t-shirts increase, there would be an excess of demand over supply. This would lead to a shortage. This would increase the price of t-shirts. In the long run, more suppliers would enter into the industry and this would increase supply of t-shirts. As a result, equilibrium would be restored.
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