I think it is housing prices. Banks sign money into existence as your debt. And then you work to pay it off plus interest. We bought our house from a single old lady for about 195.000 euros (plus 40.000 for restructuring and then some for taxes), this woman bought this house in the sixties for 19.500 guilders (8.850 euros), she got about 186.000 euros just for living there for 50 years.
Meanwhile we pay the bank 4.85% of 245.000 yearly for 30 years (ok, it's less now for sure) but that 4.85% would amount to 349.000 euro's for the banking system, just for signing my debt into existence. In this way they constantly squeeze society.
If you do the math you see that you pay over 300 a month to decrease the debt while paying about 1000 in interest. If housing prices rise more than wages at some point both parents have to work full time and can afford less and less luxury items. Then we are at "maximum squeeze".
Can you imaging that my parents once payed 12% mortgage interest! of course houses were cheaper then (this was early 80's) but still.
People with 2 incomes by the way can save a full income (although I know some people that really can't afford to have one parent at home), they really don't feel anything, but banks are eating away are our wealth people, wake up. And when the banks fall because they took to much risk, they require our money again, to be saved!