In a competitive market, ___________ will function to equalize the quantity demanded by consumers, and the quantity supplied by producers.

• A. Equilibrium
• B. Cost
• C. Demand
• D. Price

Answer: (D)

In a competitive market, price acts as the coordinating mechanism that brings together buyers and sellers. When there is more demand than supply at the current price, buyers are willing to pay more and producers are motivated to supply more, pushing the price up. Conversely, when there is more supply than demand, prices fall, reducing supply and increasing buying, until the two sides meet. This adjustment continues until the quantity demanded by consumers equals the quantity supplied by producers, at which point the market clears. So, price is the factor that moves the market toward balance, while cost and demand influence behavior but do not themselves automatically equalize the two quantities.