I would strongly dispute this. According to the OECD, median household disposable income (adjusted for purchasing power) in the US is $10,000 per year, more than 20% higher than Germany, and $12,000 per year higher than the OECD average.
Health care and educational expenses don’t come close to wiping out that difference for the median person. The median American household has no student loan payment, and spends just a couple of thousand per year on out of pocket health care costs: https://www.kff.org/health-costs/press-release/interactive-c...
> For example, a person with employer coverage earning $50,000 annually spends on average $5,250, or roughly 11% of her income, on health care. This includes $800 per year in out-of-pocket costs, a $1,400 premium contribution, and $3,050 in state and federal taxes to fund health programs.
(The OECD disposable income statistic is after taxes, so the $3,050 in taxes above should be excluded from the comparison.)
The US system is optimized for the top 60%, and further optimized so the middle 40% doesn’t have to pay EU-level taxes to bankroll a safety net for the bottom 40%. It’s optimized at maximizing material comfort for the majority of people who never get seriously ill before they’re eligible for Medicare, as opposed to optimizing for raising the floor for people who get unlucky.
https://www.forbes.com/sites/aparnamathur/2018/07/16/the-u-s...
https://www.economist.com/graphic-detail/2018/02/14/american...
In other words, if you come from the upper end of the distribution, income inequality is a feature not a bug.
Take this scenario:
1. You go from 1st quintile (10K EUR) to 5th quintile (100K EUR) in Europe.
2. You go from 1st quintile ($10K) to 4th quintile ($110K) in the US.
By this measure, Europe has better mobility, but the person in the US ends up with a higher income.
Consider thinking about it using an extreme: If I'm earning (and spending) in the top percentile in NYC or London, I assuredly have a very nice standard of living, but the effort (personal growth, career, etc) to move to that top percentile from anywhere else is far lower in London than it is in NYC.
In my career, the biggest bumps in compensation have been through events that I had little to do with. Pick the right industry and company, pass the hiring bar, have their wage-fixing cartel broken by Facebook, and let stock-price appreciation do the rest. I worked hard, but I worked hard mostly because what else am I going to do with my time?
I also feel like there's a difference in working models between your post (and by extension, most middle-class and lower people) and how people actually get to the top income & wealth percentiles. Most people believe it happens through hard work: put in the hours, learn the material, diligently do what you're told, get a steady stream of promotions, and you'll get rich. In practice, this usually results in a series of 6-7% wage increases that keep you roughly where you were within the relative distribution, because everybody else is doing the same thing. All really big fortunes are made through arbitrage: identify a problem that lots of people really want solved, present yourself as the solution to that problem, profit. Work is required for this, but the returns from it are highly non-linear: you might work a little more (or sometimes even less) than someone who slaves away at their career, but get orders of magnitude more return.
If all countries are the same then you're out of luck.