Since the marginal utility of each good is equal to the value of the least important end of which he would be deprived, he compares the marginal utility of X with the marginal utility of Y. In this case, the marginal unit of X has a rank of X-4, and the marginal unit of Y has a rank of Y-3. But the end Y-3 is ranked higher on his value scale than X-4. Hence, the marginal utility of Y is in this case higher than (or greater than) the marginal utility of X. Since he will give up the lowest possible utility, he will give up one unit of X. Thus, presented with a choice of units of goods to give up, he will give up the good with units of lowest marginal utility on his value scale