It would seem logical that most people would arrange their finances like this: you look at how much you take in, then determine how much goes out. If there's any left over, that would be "discretionary" to be used or saved. However, if you have no money left over, only a fool would keep spending thereby creating debt, which necessarily creates interest on debt, which, before you know it, you've dug yourself a hole that you can't get out of. Taking apart the federal budget (washingtonpost.com)
