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Spain's wealth tax is much lower than proposed in the US & full of exemptions, including for founders + shareholders, with a massive asterisk on the whole scheme that caps the tax paid at a percentage of personal income (or 1/5 the initial tax assessment) http://www.altalex.es/wp-content/uploads/90ti0239-Gabarro.pdf …
In any case, much of Spain's wealth is kept in tax-advantaged local companies & there's not a lot of innovation. That's fine, Spain isn't obligated to try to attract founders or be a tech hub. But if the US wants the US economy, it probably shouldn't adopt Spanish tax structure.
