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Giulia Varaschin, senior tax policy adviser at the International Tax Observatory, who recently coauthored a study on wealth taxes, says there is little academic evidence that such taxes cause the wealthy to leave at a notable scale.

Chiochetti and her co-author Ninon Moreau-Kastler said a more effective structure could be based on a number that is “not manipulable.”

Quentin Parrinello, said tax justice was ⁠becoming a growing issue. "You have an increasing number of countries that are faced with difficult choices... And there's a question that lingers at the end: who needs to foot the bill?"

For the US, the logic of engaging in a multilateral treaty was to stop more countries from imposing new taxes, which also created a compliance headache for companies even if their revenue wasn't very high, explained Quentin Parrinello.

Gabriel Zucman, one of the world’s leading experts on global wealth taxation, explained this last Monday at a technical briefing for Danish economists.

Many countries are sitting on large deficits, taxes targeted at the rich raise revenue without inconveniencing the vast bulk of voters, and they serve a useful redistributive function in the face of rising wealth inequality and tax-reduction wheezes employed by the ultra-rich.

It is the French economist Gabriel Zucman who wrote the book "Billionaires Must Pay Tax Too", which caused a huge stir when it was published in France in 2025, and which we here at Dagbladet Information will be publishing shortly.

According to Zucman, recent research from several countries shows that the very wealthiest often pay a lower effective tax rate than the rest of the population. This is partly because a large proportion of their financial income does not appear as ordinary taxable income.

“This is quite a big increase in their tax burden, so they are very vocal about this. They’re very active on social media, and it’s a very international community,” Wouter Leenders.

At the European Tax Observatory launched by economist Gabriel Zucman, models predicted a yield of up to €4 billion. Based on this estimate, the economist advocated a minimum rate of 25%.