Which one of the following will not cause an increase in the demand for cabbage?
A decrease in the price of cabbage.
An increase in the price of cauliflower (a substitute).
A decrease in the price of meatballs (a complement).
An increase in consumers' income.
An increase in the price of cauliflower (a substitute).
If the price of cauliflower (a substitute for cabbage) increases, consumers may switch to buying more cabbage instead, leading to an increase in the demand for cabbage.