Concept:In a free market economy, prices act as signals that guide the allocation of goods and services.
Explanation:The price system, also known as the price mechanism, determines what is produced and how goods are distributed.
It works through the forces of demand and supply.
When demand for a good rises, its price increases, encouraging producers to supply more.
When demand falls, the price decreases, causing producers to reduce supply.
Therefore, goods and services are allocated according to consumers' willingness to pay and producers' response to prices.
Answer:A. the price system