How Do You Hold on to a Stock That Goes Up 50x?

We bought Dell, Nokia and America online in the mid-90s. We didn't know if it was going to go up at all but it certainly had the potential to do so. Part of the thing is you have to try and understand the potential of the company. General Motors is not going to be a 50-begger. AOL was a very new company, a small company in a big new area.