Utility and rational consumer behaviour — practice question

To achieve the greatest satisfaction from a fixed amount of spending on two goods, X and Y, a consumer should divide his expenditure between the two goods so that

• Amarginal utility of X = price of X and marginal utility of Y = price of Y.
• Bmarginal utility of X plus marginal utility of Y is maximised.
• Cmarginal utility of X = marginal utility of Y.
• Dmarginal utility of X / price of X = marginal utility of Y / price of Y.