Sometimes it is easy to get suckered into buying more than we need because the price sometimes drops when you buy more. However, if you end up buying more than you need and you end up letting some go to waste, then you have really not saved any money at all.
For example, one time my husband and I were really hungry and we stopped at a grocery store. The lady behind the counter was selling various flavors of chicken wings and she managed to persuade us to buy two pounds of them! You see, the price dropped by a dollar a pound if we bought at least two pounds. Her argument was you might as well get two pounds since the price drops.