He might be an expert in uranium, maybe mining (not proved of...

He might be an expert in uranium, maybe mining (not proved of course), but what do experts about a field about how about stock market investing/speculation, or else they would all be super rich, being privy to the kind of kind of knowledge reserved for 'experts.'

The only expert I trust in the stock market is the expert on human nature, the market is a manic depressive capable of ignoring all facts until the very end. I know people who have made fortunes in the market knowing almost nothing about the fields in which they invest in. It's quite trite to say, but when all you have is a hammer, all you ever see are nails,