Answer and explanation:
Market economies are those where the price is driven by supply and demand forces. They promote private property and little to no government intervention. However, it could lead to unfair market practices and arbitrary pricing restricting access to certain goods or services from unfavored sectors of the market.
In the case, the price ceiling could be set on consumer staples -as usual- such as gasoline while price floors could be established for wages. In such scenarios, central planning is necessary. Setting price floors and price ceilings could be a measure to be implemented to avoid setting prices below from what individuals can profit (floor) or above from what consumers can afford (ceiling).