Four mistakes investors should avoid

Investing isn't easy. If it was, we'd all be billionaires like George Soros. Picking the right stocks to buy and the right time to buy them are skills that can take years to master -- and yet many seasoned investors still lose money. After all, despite our best efforts at research, none of us ultimately know what fate may have in store for any company or how the economy may perform in the next few years. That's all part of the great mystery of investing.