The average US family had an annual income of $956 in 1940. That is $17,268.43 in todays dollars, far more than $3k. And that was almost entirely earned by a single individual rather than both adults in the household working like now. Also, someone earning that little paid no income tax. The average house price in 1940 was $2938, which is $53k in today's money. Now the average family income is $70k, but that's mostly two people's income, they only get to keep $60k because of income tax, and houses are $200k. So we earn about twice as much, but houses cost about 4 times as much. It isn't nearly as clear cut a win for modern life as you make it out to be.