If an indifference curve is straight (i.e., it doesn't "bow" inward), the marginal rate of substitution is always constant.

Question

Quizplus · Accepted Answer

A straight indifference curve indicates that the individual is willing to substitute one good for another at a constant rate, which means that the marginal rate of substitution (MRS) is constant. This is because the slope of the indifference curve is equal to the MRS, and a straight line has a constant slope.

If an Indifference Curve Is Straight (I