There is an economic law that states that the utility of any good declines the more one consumes of it.In other words, the more we have of a good,the less we desire it.This is referred to as the "law of diminishing marginal utility if he eats a slice of pizza for lunch.If he eats a second piece, it provides less utility than the first one.A third piece of pizza provides still less. Eventually,the cost of slice of pizza would exceed its marginal utility and the person would not purchase more(see Table 1.)