What effect might a decrease in the price of tomatoes, a substitute, have on the demand for avocados?

When the price of tomatoes decreases, it affects consumer behavior since tomatoes and avocados are substitutes in consumption. A substitute good is one that can be used instead of another good; in this case, if tomatoes become cheaper, consumers might prefer buying tomatoes over avocados because they can achieve similar satisfaction at a lower expense.

As the price of tomatoes drops, more buyers will opt for tomatoes instead of avocados, leading to a decrease in demand for avocados. This shift occurs because the lower price of tomatoes makes them a more attractive option, causing consumers to redirect their spending from avocados to tomatoes.

Thus, the correct answer indicates that the demand for avocados will decrease as a direct consequence of the declining price of tomatoes.