When deriving the market demand curve for a commodity, the only variable(s)that can change is (are)the

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The market demand curve for a commodity is derived by adding up individual demand curves for that commodity from all consumers in the market. The only variables that can change when deriving the market demand curve are the quantity of the commodity demanded (as this is what is being plotted on the horizontal axis) and the price of the commodity (as this is what is being plotted on the vertical axis). Income of consumers and price of a related commodity can shift individual demand curves, but they cannot change the market demand curve itself.

When Deriving the Market Demand Curve for a Commodity, the Only