Which of the following is NOT a nonprice determinant of demand?

A nonprice determinant of demand refers to factors that can influence the demand for a good or service without changing its price. These determinants include consumer income, consumer preferences, and the prices of related goods (substitutes and complements).

Consumer income affects demand because as income increases, consumers typically are able to purchase more goods and services, leading to an increase in demand for normal goods. Consumer preferences reflect the trends and tastes that can shift demand in favor of certain products. The prices of related goods can also impact demand; for instance, if the price of a substitute good falls, consumers may opt for that good instead, decreasing demand for the original product.

In contrast, supply levels relate to the amount of a good or service available in the market, which is a factor that influences supply rather than demand. Therefore, stating that supply levels are not a nonprice determinant of demand emphasizes that they do not directly affect how much of a good consumers are willing to buy at different prices.