 There are many other kinds of theses that go under the title of the incomparability or incommensurability of values. For example, some theories which posit lexical orderings are said to commit to “incomparabilities”. Kant’s thesis that rational agents have a dignity and not a price is often taken to be a thesis about a kind of incommensurability, as well. Some have interpreted Kant to be holding simply that respect for rational agents is of infinite value, or that it is to be lexically ordered over the value of anything else. Another thesis in the neighborhood, however, would be somewhat weaker. It might be that a human life is “above price” in the sense that killing one to save one is not an acceptable exchange, but that for some positive value of \(n\), killing one to save \(n\) would be an acceptable exchange. On this view, there is no single “exchange value” for a life, because the value of a human life depends on whether you are “buying” or “selling” — it is higher when you are going to take it away, but lower when you are going to preserve it. Such a view would intelligibly count as a kind of “incommensurability”, because it sets no single value on human lives.