Thomas Sowell on Price controls

“In a free market, supply and demand would cause prices to rise where goods are in short supply and fall where they are abundant, providing incentives to move things from regions where there is a surplus to regions where there is a shortage. But where prices are fixed by law, no such price movements occur and there is no incentive to move goods between the two regions. Theoretically, a government planning commission could either issue orders to move these goods or change the prices in order to provide incentives for others to move them.”

“While price controls make it illegal for buyer and seller to make some transactions on terms that they would both prefer to the shortages that price controls entail, bolder and less scrupulous buyers and sellers make mutually advantageous transactions outside the law. Price controls almost invariably produce black markets, where prices are not only higher than the legally permitted prices, but also higher than they would be in a free market, since the legal risks must also be compensated. While small-scale black markets may function in secrecy, large-scale black markets usually require bribes to officials to look the other way.”