The DVD Trading Places stars Dan Aykroyd and Eddie Murphy. Murphy stars as a small-time con artist who gets a chance to switch lives with Aykroyd, a big time commodity market maven. But their reversal of fortunes is a cruel joke perpetrated by two bored mega-rich brothers (played by Don Ameche and Ralph Bellamy) as part of an idle bet. It is comedy gold and an object lesson in the operation of a commodity exchange. So what is a pork belly?