(1) more like 50-60 years.
(2) there’s a feedback loop: the more 2-income earners, the more the market reacts as if every family has two incomes, making it harder to live on one income. The target market has changed.
(3) you see this with housing sizes — your grandparents were probably happy in a 1300 sq foot home. But, there aren’t many of those around any more (and, those that are were built when your grandparents were buying houses.). They aren’t being built anymore because the housing market is now calibrated to two-income households.
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