As a consumer, in my mind, $1.25 occupies the same mental space as $2.00. If I am paying $1.25 for a bag of chips then I am not likely to buy anything else because that puts me over the $2 threshold. Now, if that bag of chips was $1.00, I’ll probably have no problem buying a drink or another snack. As a consumer, I’d rather pay out $2 and get two items than mentally pay $2 (actually $1.25) for 1 item. And, as the operator of that machine, would you rather have a customer make 1 purchase at $1.25 or have that same customer make 2 purchases at $1.00? I am not saying that everything should be $1.00, but just knowing a little about consumer psychology is helpful. Cheaper prices bring higher sales volume, consumer trust, and repeat business.