Spending money unnecessarily is habit-forming, and a good way to break the cycle is to challenge yourself to no-spend days. Most of you admit that shopping makes you feel good after a bad day, but you can also gain satisfaction from successfully living up to a challenge like not spending for one day. It requires advance planning like picking your groceries, filling up the tank and paying the bills the day before, but it is doable. Are you able to keep your wallet in your purse — or even at home — on select days or is dishing out money unavoidable?