What is an example of substitute goods?

Question

Quizplus · Accepted Answer

Butter and margarine are substitute goods because they are both used as spreads for bread or cooking. If the price of butter increases, people may switch to buying margarine instead. Similarly, if the price of margarine increases, people may switch to buying butter instead. Tennis balls and tennis rackets are complements, not substitutes; televisions and tractors are not related goods; and peanut butter and jelly are complements, not substitutes.

What Is an Example of Substitute Goods