A straight line indifference curve indicates that the two products are

A straight line indifference curve indicates that the two products are perfect substitutes. This means that the consumer is indifferent between the two products and is willing to exchange one for the other at a constant rate, regardless of the price or quantity consumed. For example, if a consumer is equally satisfied with consuming one apple or one banana, and the price of apples increases, the consumer will switch to consuming only bananas as they are perfect substitutes.