One of economists' most popular beliefs is a concept called "rational economics." It asserts that a person will do what's in his best financial interest. Only problem is, the idea fails in the real world over and over.
Every dieter knows you sometimes have to give in to your cravings on the long road to a weight loss goal. Turns out the same principle applies to personal finance: A splurge now and then can actually help you attain your budget and savings goals.