Which statement correctly expresses the equi-marginal utility rule?
- AThe marginal utility of X must equal the marginal utility of Y.
- BThe marginal utility of X divided by the price of X must equal the marginal utility of Y divided by the price of Y.
- CThe marginal utility of X divided by the price of Y must equal the marginal utility of Y divided by the price of Y.
- DThe price of X must equal the price of Y.