A free price system or free price mechanism is an economic system where prices are set by the interchange of supply and demand, with the resulting prices being understood as signals that are communicated between producers and consumers which serve to guide the production and distribution of resources. Through the free price system, supplies are rationed, income is distributed, and resources are allocated. A free price system contrasts with a controlled or fixed price system where prices are set by government, within a controlled market or planned economy.