A price tag merely denotes the amount of money the current owner is willing to exchange his or her goods for. Recent exchanges may or may not be a factor. Buyi

A price tag merely denotes the amount of money the current owner is willing to exchange his or her goods for. Recent exchanges may or may not be a factor. Buying on the spot usually means paying the price tag (as a trip down to the next supermarket would probably confirm), which would mean that the price tag usually is indicative of what you'd pay.