Horizontal Summation of Individual Demands

Steps:

• Identify the quantity demanded by each buyer at every price level from their curves.
• Add the quantities from both buyers horizontally for each price to get total market quantity.
• Plot total quantity against price to form the market demand curve.
• Match the plotted curve's shape to the given options.

Why C is correct:

• Market demand is the horizontal sum of individual demand curves, as defined in microeconomics, producing a downward-sloping curve that aligns with option C.

Why the others are wrong:

• A: Shows a vertical curve, ignoring quantity summation.
• B: Depicts an upward-sloping curve, violating the law of demand.
• D: Features incorrect kinks or slopes not resulting from summation.

Final answer: C