Answer to Question #16683 in Microeconomics for Jenny

Question #16683
Mrs. Simpson buys loaves of bread and quarts of milk each week at prices $1 and 80 cents, respectively. At present she is buying these products in amounts such that the marginal utilities from the last purchased of the two products are 80 and 70 utils, respectively. Is she buying the utility-maximizing combination of bread and milk? If not, how should she reallocate her expenditures between the two goods?
Expert's answer
She is not doing the right thing to maximize her utility from the consumption of bread and milk. If the last dollar spent on bread gives her 80 utils of satisfaction, the last dollar spent on milk should give her the same utility of 80. This is the utlity maximization rule of equating the marginal utility per unit of money spent on the different products/ goods. But in this case she spend 80 cents to get 70 utils from the last quart of milk. In other words she roughly gets 87.5 utils by spending the last dollar on milk. So by reducing her spending of one dollar on bread, she would lose 80 utils but would get 87.5 utils by reallocating that dollar withdrawn from bread to milk purchase. So, to maximize utiliy she should increase the consumption of milk a little more.

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