How Much Money Will You Really Spend in Retirement and what percent of your pre-retirement income should you guarantee yourself POST retirement? Well, according to research published in the Wall Street Journa., probably a Lot More Than You Think! As Dan Ari-e-ly, the James B. Duke Professor of Psychology and Behavioral Economics at Duke University recently wrote in the Wall Street Journal, most of us vastly underestimate the percentage of our pre-retirement income we’ll need, POST retirement.. Today, we’re going to explore the results of the fascinating research and then Steve will demonstrate the formula for making sure YOU get your retirement income number right. You don't want to miss today's show --MASTERING MONEY IS ON THE AIR!!