What works on Wall Street

Can you sort of sum it up for us a little bit? Because I think there's some real gold in what you've just mentioned there.

Yeah, the first time I really realised how important that message was, was a story that I'd heard from Jim O'Shaughnessy, who's written a brilliant book called What Works on Wall Street.

So he's a kind of quant investor, An incredibly funny guy.

He has the best memes on Twitter.