One is a decline in "retail saving" due to concentration of wealth in the hands of those who don't do much "retail saving." Another aspect might also be the growth of alternative investment options for the middle class also.
Alternatively, all we know is that they don't have the deposits to back the loans they make. But that could be because they have worked hard to make many more loans than before?
I'll try to dig out some figures on "retail deposits."
