 In articulating the kind of value love involves, Velleman, following Kant, distinguishes dignity from price. To have a price, as the economic metaphor suggests, is to have a value that can be compared to the value of other things with prices, such that it is intelligible to exchange without loss items of the same value. By contrast, to have dignity is to have a value such that comparisons of relative value become meaningless. Material goods are normally understood to have prices, but we persons have dignity: no substitution of one person for another can preserve exactly the same value, for something of incomparable worth would be lost (and gained) in such a substitution.