Does it really matter? Anyway, we know that class mobility is fairly limited as a whole anyway, but whether it's the same group of people or not is almost irrelevant; in either case we have a tiny, miniscule fraction of the population with a massive percentage of the wealth. Even if it's a revolving door it's still a situation the vast majority of Americans will never experience.
It's totally relevent.
What's the damn problem if once in a while somebody in the US makes good money?
If the top 5 percent were to change every year, in 10 years time 50 percent of the people would have been up there.
I see the problem if it's ALWAYS
only the same people, but there's no evidence of that.
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And you're badly mixing up the meaning of these stats. Taxable income != wealth.
You can be very wealthy and have a low taxable income. You can have a pretty high taxable income and fairly unimpressive wealth (or even negative).
I'm working on a person's case right now who made about $500k a year for many years but is now bankrupt - their business folded due to the ecomony, lost money in the stock market, blew through all their retirement savings trying to keep the bussiness afloat and their employees working in hopes the economy would turn around, their big home is underwater and has been forclosed on etc. Looking at these stats the way you do you would think that they are wealthy; yet it's the opposite.
Some countries actually have a 'wealth tax' and they fill out forms reporting what they own vs their debt. We don't have that here in the US, consequently we don't have any stats on "wealth".
And in general I disagree with your assertion that "the vast majority of Americans will never experience" a year in a top tier. But even if more-or-less true, what's the problem? Many strive to be rich, some make it and some don't.
Perpetual poverty should be the focus, not those occasisonally making some good money. IMO, you people are looking at the wrong end of the scale. How to break any perpetual cycle of poverty for some of permanent underclass group should be the concern. and you're not gonna solve that by eliminating the possibility of a 'big year' for everybody else.
Fern