That optimism that keeps you going in a start-up? It's trouble for your portfolio. Read more
Bill Harris, CEO of Personal Capital, was formerly CEO of PayPal and also Intuit, the makers of Quicken, QuickBooks and TurboTax. He founded numerous financial technology and security companies, and served on the boards of RSA Security, Macromedia, SuccessFactors, GoDaddy and EarthLink.