Yes, it would be difficult, and the only way we are going to pass this (and anything else) is if we control the House, Senate and presidency. One of the primary advantages of SP is it outrights eliminates much of this needless, expensive and excessive complexity, and all but eliminates private health insurance as a toxic lobby that prioritizes their profits over the healthcare and well-being of Americans, and tirelessly works to pervert our governance to these ends. Stuffing the courts FDR style might be necessary in light of the conservative blight infesting it. It's high time we dispense with any silly and ridiculous notions of the Supreme Court being above the political fray, and recognize it as the football it clearly is and has always been.
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OK, I looked at your source for a discussion on European wealth taxes. I had previously seen another one (it would be hard for me to find it) talking about 18 countries cancelling them and 4 keeping them. Your source talks about 12 that had them in 1990 and 4 keeping them. I guess my source (which didn't list the countries) either analyzed a longer time span or included other countries in Europe but outside the EU.
Anyway, your article does confirm that it all backfired in the majority of countries. France lost twice as much revenue as it collected. Germany cancelled it through their Supreme Court finding it unconstitutional to treat differently a cast of people (the same challenge that is likely to happen here).
I explored a link in your article with more details on the four countries that kept them - Spain, Norway, Switzerland, and Belgium. Even though they set the threshold much lower than Bernie and Warren propose, they still didn't make much money from these taxes: Spain, 0.55% of their revenue; Norway, 1.1%, Belgium, too early to gauge (it's been done recently, probably triggered by the fact that lots of rich people moved from France to Belgium to avoid French taxes, so Belgium decided to cash in, with a tiny tax on the rich that started in 2019), and the only country with a bit of more success on this was Switzerland which collected 3.6% of their revenue this way - but then, as a banking haven, Switzerland has other advantages for the rich who are less likely to flee them; it's a quite unique case, and they had these taxes since 1840. It seems like everywhere else, it either didn't work (even decreasing the revenue) or added a negligible amount to the treasury.
So your main objection to what I was saying is that it wasn't just capital flight but other reasons too, such as administrative costs, and like the article says, too many exemptions and loopholes, too many difficulties to gauge the true value of assets, and constitutional challenges.
So maybe I was partially mistaken about the reason for the failure, but see, the reason doesn't really matter. What matters is that it failed, extensively, almost everywhere, and for several reasons, so why exactly do we think that it will happen in America, especially in a political environment where the courts are very conservative and partisan, and lobbies are such that according to a Stanford University study, decisions in Congress are influenced by corporate lobbies at a rate of 99.5% while only 0.5% of decisions have the people's interest at heart?
We'd see loopholes, exemptions, and challenges here too. And regarding the United States, your article says:
"For progressives to invest their energy in a proposal that the Supreme Court has better than a 50% chance of declaring unconstitutional, that has very little chance of passing through the Congress, whose revenue potential is extraordinarily in doubt... it seems to me to potentially sacrifice an immense opportunity," said former Treasury secretary Larry Summers at a Peterson Institute panel on inequality last month in Washington. Tax experts also say it could also prove difficult to appraise a financial value onto what a person owns.
So, the bottom line is, regardless of the reasons which are many, this kind of thing is unlikely to work. If so, then tell me, how in the hell will we pay for all the programs that Warren and Sanders want to implement?
So, again, like the physician per capita issue, you posted a link that seems to support my position more than yours.