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you can buy a house even on a median salary or lower.
I think think this very regionally dependant. Median household income and house cost in Austin, for example, is ~$70k and ~$650k, respectively. I grew up in a very small rural town, very far from any cities, and even though houses were much cheaper, they were still unaffordable to most people unless they could land one of the few available union jobs (most jobs available were in manufacturing and paid near minimum wage).
Things may be getting better, slightly, for the median person, but inequality is soaring, and a more dangerous problem IMO. Money is power, so inequality is a direct threat to democracy. It’s also inequality, not poverty, that has the largest effect on crime rates, and social decohesion in general.
I don’t understand the Scrum one. Scrum is also agile with short development cycles, and prioritizes communication with the product owners and stakeholders.
I’ve never heard of lean development, but not a fan of “lean manufacturing,” at least not the way it’s commonly implemented in the U.S. (using primarily temp workers so they can ramp up and down their workforce as needed; and it also exacerbates supply-chain problems).