[runamok]

> It was recently reported that since 2007, the richest thousand people in the UK have doubled their net worth.

Based on the rule of 72 (https://en.wikipedia.org/wiki/Rule_of_72) that sounds about right for that time frame. 72 divided by 8 years is 9% per year.

Keep in mind that wealth is probably mostly on paper and could disappear just as easily.