I doubt there's a way to structure this perfectly given one has to start from the baseline of these taxes being introduced, but is 21-25 a reasonable benchmark?

Naively, it felt like a lot of fluctuations and rubberbanding occurred right after Covid which wouldn't necessary make representative set.

They lost the future billionaires along with those who left.

Reducing taxes attracts billionaires which improves the country better / more?

Now that we have the socialist Trump doctrine established with the help of the tech billionaires, we have a precedent for going forward - partially nationalize the private entities.

Start with the startups, and move into the equity funds and family offices. Once you hit certain thresholds, you pay a 2.5% wealth tax or provide 1% equity, capped at 25%.

It’s totally legal now as the toadies on the Supreme Court have adopted an expansive interpretation of executive power.

TLDR Norway’s recent wealth-tax increases caused some very rich people to leave, but the “billionaire exodus” was economically much smaller than the headlines suggested—and the tax still raised a lot more revenue without detectable damage to business investment.