Hahaha this is so bogus.

Americans really struggle to understand how tax work outside of their country.

First, the whole premise of income to wealth tax equivalence is non sensical, because interests are rarely literally in the form of coupons/payments, but rather left as compounding value. This is the whole point of share buybacks, reinvested ETFs, etc; and Paul Graham knows that of course. If you are rich, you don't need the cash of your investments, so you don't want to trigger taxable events, so you are effectively at 0% tax rate and just let it compound.

> Currently the country with the highest marginal income tax rate is Denmark, at 60.5%

This is the most BS statement ever, and would only be believable to Americans with no understanding of how foreign country do taxes. Which is at best very naive of him, or highly disingenuous. This is because "tax" in the US is essentially employee paid, whereas most other countries split the bill between employer and employee at a higher proportion. The result is the same, but the employee part only is labeled "tax", the employer part being often called "contribution".

When comparing across countries, you have to look at the tax wedge (super gross to net), not the tax rate (gross to net).

And if you do that, well the US has a lower tax wedge than even the most generous European countries (Ireland).

In France for instance, the tax wedge is close to 70% for the higher bracket. Yes, that means if your employer pays $100, you get $30. And that's in a country with 20% VAT compared to US ~8%.

Not to mention, except super rich little little business-hub countries (Hong Kong, Singapore, Ireland, Malta, Cayman Islands, etc), pretty much all _developed_ countries have some form of wealth tax, it's just common sense.