41. Marginal utility (MU) is the additional satisfaction obtained from consuming one additional unit of a good. Therefore, if a consumer has spent all his/her income on two goods, A and B, at a certain price (P) for each with the marginal rate of substitution (MRS) = PA/PB and we find that MUA/MUB = PA/PB, we can say that a) the consumer should purchase more of A and less of B. b) the consumer should purchase more of B and less of A. c) the prices of goods A and B must be equal. d) the consumer cannot increase his/her utility. e) MUA must equal PA