The extremely wealthy are growing in numbers and entire industries are being created to cater to their desires but where are the individuals who are amassing vast fortunes based and what do we know about them?

Companies and websites are springing up to track and analyse the names, numbers and needs of the mega-wealthy, you can even get a daily update on who today’s richest man (it’s always a man) is.

So what can we tell from all of this analysis about the wealthy and the kind of world their rise is creating?

BBC