Aren't house prices an aggregate of 'owned outright' via cash, inheritance, debt repayment and 'loaned against' in the form of bank loans against real estate? There's been a dramatic inflation in housing debt, worldwide, that first precipitated the financial crisis a decade ago, and that continues to overhang economies worldwide. It was observed a long time ago that 'the debtor is servant to the lender.' You can't look only at private household wealth, you have to look at bank balance sheets as well. I bet if you include bank balance sheets, you can find a 'small group accumulating so much money.'