I see the figures in these stats. I find them hard to reconcile with what I see though. I see people living at a level that seems at odds with their income. Mostly at the low and middle earners. Anyone I know at the top end of earners, is relatively, frugal, in context of that they earn. Its not just that people are living beyond their means, or its all on credit, or very good at making the most of their money.
I would see AAM reflects some of these. You have people on low incomes struggling. You have people on high incomes mainly future planning, or investing. Well off people being frugal. That makes sense. You don't really get the people living way beyond their means or a credit bubble.