## Example

Alice's utility for chocolate and strawberries is $$u \left( X, Y \right) = X \times Y$$

Her marginal utility for chocolate is $$ \begin{equation*} MU_X = \frac{du \left( X, Y \right)}{dX} = \frac{d X \times Y}{dX} = Y \end{equation*} $$

Her marginal utility for strawberries is $$ \begin{equation*} MU_Y = \frac{du \left( X, Y \right)}{dY} = \frac{d X \times Y}{dY} = X \end{equation*} $$

### Question

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