Buying Low

The conversation began...

E: I cut your hair in a bathtub that night. You remember?
N: I was drunk.

Something yanked my attention elsewhere, but I wrestled and escaped and caught the end...

N: Buy low, sell high. That's what they called it. It was 2001, maybe, and they decided it was a good time to get in. So they grew mustaches. They figured it'd blow up. It didn't. Which is too bad.