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Wiktionary
price floor

n. (context business English) An imposed lower limit on the price charged for a good or service.

WordNet
price floor

n. floor below which prices are not allowed to fall; "the government used price supports to maintain the price floor"

Wikipedia
Price floor

A price floor is a government- or group-imposed price control or limit on how low a price can be charged for a product. A price floor must be higher than the equilibrium price in order to be effective.