A free market economy is when the prices of supply and demand are free from the government. Meaning they can charge whatever they want and the government has to say. So answering your question they can just charge less if they felt like it since they have free reins of the prices.
A command economy is the opposite whereas supply and demand prices are determined by the government and the government only. The government would probably not change the prices because the government sucks.
(A mixed economy is the best way to achieve that)
