I'll take an example for my local store. We have some Belgian waffles that cost 18 NOK a piece. They always have an offer that gives you 2 for 20 NOK. I never

I'll take an example for my local store. We have some Belgian waffles that cost 18 NOK a piece. They always have an offer that gives you 2 for 20 NOK. I never eat more than one of these and they end up spoiling as they don't last very long, and even if it seems that I'm "saving" 16 NOK on the purchase I'm actually spending 2 more than I otherwise would.