Since government has decreed a lower price, the demand has risen while the supply has remained unchanged. The available supply now does not suffice to satisfy the demand at the fixed price. Part of the demand will remain unsatisfied. Since production is no longer profitable at the regulated price, it is curtailed or even halted. If government would like production to continue, it must force the producers to continue, and it must also control the prices of raw materials, semi-finished products, and wages.
Limited intervention leads to unlimited intervention.
If any industry should remain free, capital and labor will move to it and thus frustrate the purpose of the government's earlier intervention. Interventionism never quite produces the results its arrogant implementers intend, and determined producers can circumvent the most cumbersome regulations. That's lucky for us, for we might all starve otherwise. The average citizen, nevertheless, seems unable to draw the obvious conclusion. The very failure of interventionism reinforces the layman's conviction that private property must be controlled severely.