It's hard to move the Rock of Gibraltar. Crack-cocaine's got nothing on it. This is true in the same way that babies come from hospitals.
Babies do come from hospitals.
But there's a deeper and more meaningful explanation of where babies come from, which is what we're going to do now. If P k is greater than PV, do not buy. If P k is less than PV, buy. No, this is not English literature, there are actually right and wrong answers here. That's the great thing about intellectual life.