One of his definitions says that economics is the science that studies the allocation of scarce resources and resources.
A market economy is characterized by free capital mobility and free entry. The regulation of this type of market is given by free trade and the law of supply and demand, which has the price as an adjustment vector. Thus, if the resource is scarce, the price is high and demand fits. On the contrary, when the resource is abundant, the price is low and the demand adjusts.
Thus, to allocate scarce goods and resources, a market economy uses price rationing. This means that individuals will receive the goods and services if they have the ability to buy.