#4-3-the-investment-opportunity-set #cfa #cfa-level-1 #economics #has-images #microeconomics #reading-14-demand-and-supply-analysis-consumer-demand #section-5-consumer-equilibrium #study-session-4
At a tangency point, the two curves have the same slope, meaning that the MRSBW must be equal to the price ratio, PB/PW. Recall that the marginal rate of substitution is the rate at which the consumer is just willing to sacrifice wine for bread. Additionally, the price ratio is the rate at which she must sacrifice wine for another slice of bread. So, at equilibrium, the consumer is just willing to pay the opportunity cost that she must pay.
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