Yours is an example of the constant play with imprecise and precise concepts, here at the fora. You -plural- can always start a feud based on that or give free rein to a substitute of sarcasm, sometimes good enough in a I-can't-believe-it's-not-sarcarsm way.
If by "school" you really intended to refer to the School of Salamanca, your clock is more than four centuries behind, and it's as relevant to determine the modern theory of value as Plato is to contemporary philosophy. If that's the case, I take your comment as tongue-in-cheek, at best. If by school you were implying something relevant to the last 50 years, you forgot to tell which one. Telling which contemporary school drives, as far as you know, this ppp thingy as opposed to what other contemporary schools may prescribe instead, that is really a good point to enrich this thread, which in more than one place has been more of the kind of "the thread's title doesn't exist because, didley-dee potatoes!"