Which statement directly affects the level of supply in a market?

• A. The number of producers entering or leaving the market
• B. The price of the good itself
• C. The consumer's income
• D. The price of related goods in demand

Answer: (A)

The level of supply is determined by how many producers are in the market and able to bring goods to market. When more producers enter, total potential output rises, so supply increases at every price (the supply curve shifts right). When producers leave, supply falls (the curve shifts left). This is why the number of producers directly affects the level of supply.

The price of the good itself affects quantity supplied along the same supply curve—producers respond to higher prices by offering more of the good, but that’s a movement along the curve, not a shift in the overall level of supply. Consumer income and the price of related goods in demand influence demand, not supply.