The government of country x found that farmers earned little profit by selling wheat to wholesalers at the market price of $5.50 per bushel. to farmers, the government decides to the price of wheat. this adjustment is an example of government intervention through a .

I believe the answer is: Price floor
Price floor refers to a form of Government regulation that put a limit on how cheap a certain product can be sold in the market.
Imposing price floor will guarantee a certain level of margin for the sellers and will increase their average profit.