 You then rebalance that portfolio and make strategic tax trades along the way. And you repeat that for the rest of your life. The idea that you should only invest in exactly what you know, that's outdated financial advice. As Americans, we waste $473 billion on this one thing each year. I do it and I bet you do it too. I'll reveal what it is in 60 seconds. I'm John Higginson and this is Rethink Your Money.