But, and this is the big point, not only do these two top this league, they are followed by Microsoft in number three place, Facebook at six and Amazon at nine. So half the top 10 are US West Coast companies, all part of the great tech revolution. And they are, in corporate terms, very new. The oldest of them, Microsoft, is only just over 40 years old while the youngest, Facebook, was founded 12 years ago this month.