The first comment I see saying this. What about the percentage of people who actually own their home? Who can afford a "party"? It does mention dual income but how correlated is this change with the decoupling of economic productivity gains with worker wealth and income?

Home ownership in the US is higher now than in the 70s https://fred.stlouisfed.org/series/RHORUSQ156N

Along with inflation adjusted (real) disposable income: https://fred.stlouisfed.org/series/A229RX0