The correct answer is: B. Marginal rate of substitution.
The marginal rate of substitution (MRS) is the rate at which a consumer is willing to give up one good in exchange for another. It is measured as the ratio of the marginal utility of the two goods.
The slope of an indifference curve is equal to the marginal rate of substitution. This is because the indifference curve shows all the combinations of goods that give the consumer the same level of satisfaction. If the consumer is willing to give up more of one good in exchange for another, then the marginal rate of substitution is high and the indifference curve is steep. If
23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube