Which factor does NOT influence the demand curve?

The correct answer indicates that the availability of consumer credit does not directly influence the demand curve itself, while the other factors do have a direct impact.

The demand curve represents the relationship between the price of a good or service and the quantity demanded by consumers. Each of the other options directly affects consumers' willingness and ability to buy a product.

The price of complementary goods affects demand because when the price of a complement rises, it can decrease demand for the associated good, as consumers are less likely to purchase both together. For example, if the price of printers increases, the demand for ink cartridges may decrease.

Similarly, the price of substitute goods affects demand in a way that if the price of a substitute rises, consumers may shift their demand toward the cheaper option. For instance, if the price of butter increases, more consumers may choose to buy margarine instead.

The size of the population influences demand because a larger population often leads to a greater number of consumers in the market, thus increasing demand for various goods and services.

In contrast, while consumer credit availability can influence consumers' purchasing power and their ability to buy goods, it does not shift the demand curve itself. It affects the quantity demanded at a given price level, rather than changing the demand relationship as