The price mechanism is a mechanism that allocates scarce resources by regulating supply and demand. When demand for a particular good or service increases, the price of that good or service will rise, which in turn encourages suppliers to increase the quantity of the good or service that they produce. Conversely, if demand for a good or service decreases, the price will fall, and suppliers will be less incentivized to produce that good or service. In this way, the price mechanism helps to efficiently allocate resources to their most valuable uses by providing incentives for both consumers and producers to make choices that are consistent with market conditions.