Given individual demand curves for three consumers, how would you graphically represent the market demand curve?

• A. By selecting the lowest quantity demanded at each price level and plotting these values.
• B. By summing the quantities demanded at each price level and plotting these sums.
• C. By selecting the highest quantity demanded at each price level and plotting these values.
• D. By averaging the quantities demanded at each price level and plotting these averages.

Answer: (B)