Changing habits

As being so use to going to the retail store with a list of things to buy but only to find that when I enter my house that 10 persent of the things that was bought I did not take. In other words I over spent on things not being thot as a necessity. I came to notice this habits and decided to make a change. So whenever I go to the shop I make sure that I only take the exact amount of money I need.