For decades, the financial industry has sold you the BS myth of "Homo Economicus"—the lie that you are a perfectly rational being when making financial decisions. The brutal truth is that your ancient brain is hardwired for survival and dopamine-driven instant gratification, not for managing compound interest or surviving spreadsheet anxiety. When you walk into a store for milk and leave with a cart full of junk you didn't need, that isn't a moral failure; that is simply your primitive feeling brain hijacking the cart. You are fighting hundreds of thousands of years of human evolution every time you open your wallet. Read on to discover the biological saboteurs quietly destroying your wealth, and learn how to finally build a customized system that works with your natural behavior instead of against it.