At a given level of spending on two goods, X and Y, how should a consumer divide her expenditure between the two goods in order to maximise the satisfaction she obtains?
- Amarginal utility of X = marginal utility of Y
- Bmarginal utility of X × price of X = marginal utility of Y
- Cmarginal utility of X / price of Y = marginal utility of Y / price of X
- Dmarginal utility of X / price of X = marginal utility of Y / price of Y