 This is a Bloomberg Money Minute. Have you heard of the No Buy Challenge? The rules are simple. Just make a list of the non-essential items you won't spend money on for the next day, week, month, or year, your choice, and then stick to it. Carrie Rattle, CEO of Behavioral Sense, a financial coaching company, tells the Associated Press that if you're going to try this, start small. Prep yourself. Start with a few key areas first.