While I cannot prove it, I think we may take it (based on what evidence we have) that there has also been a widening of inequality within the wealth distribution (using conventional measures of inequality) since the beginning of the millennium. Furthermore, the churn within the distribution has been substantial. Clearly many people who had become rich lost all of their gains.
Every bank, in order to expand its customer base, needs to understand the requirements of its customers and the market, credit and operational risks involved in its operations.