When two goods are perfect substitutes, their indifference curves are straight lines.

Name: When two goods are perfect substitutes, their indifference curves are straight lines.
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When two goods are perfect substitutes, their marginal rate of substitution (MRS) is constant and equal to the ratio of their prices. This means that the consumer is willing to give up a fixed amount of one good for each unit of the other good. Therefore, the indifference curves are straight lines with a constant slope.

When Two Goods Are Perfect Substitutes, Their Indifference Curves Are