AP Photo/Kirsty Wigglesworth
There's a basic rule of taxation: if you want to get more tax income you can increase taxes - but only a bit. If you stray too far down that track, all you'll do is make it more rewarding for people to avoid paying it.
It seems we may have hit this point, as the rich are leaving Britain in droves. The latest to go is Simon Nixon, the man behind Moneysupermarket.com. So why is he leaving, and what can the government do to stop this exodus?