Infinitely Finite Most folks do a lot of mental math with their money. They see something they want to buy, they check their bank balance, and start doing some mental math on what other things that balance needs to be able to pay for before they buy the thing. The problem is, mental math gets very sloppy very quickly! Life is often just too complex, with too many variables to be able to hold all your future spending needs in your head at all times. It's too easy to spend the same dollar many times over when...