Which of these factors does not cause a change in demand?

The factor that does not cause a change in demand is the price of the commodity concerned. This is because the price of a commodity affects the quantity demanded but not the demand itself. Demand refers to the willingness and ability of consumers to buy a certain quantity of a commodity at a given price, while the price of the commodity is one of the determinants of the quantity demanded. When the price of a commodity increases, the quantity demanded decreases, and vice versa, but the demand itself remains unchanged. Therefore, a change in the price of a commodity would cause a movement along the demand curve, while the other factors such as income, taste and fashion, population, and price of other commodities, would cause a shift in the demand curve.