It's really impossible to say what's the effective tax rate of these people. Their real wealth is not in the money, of with they have plenty, but rather in endless opportunities.
That's not solvable with tax policy. The solution to that is DEI, but HN froths at the mouth when those 3 letters are pronounced.
Tax on income is not the problem, it's tax on wealth gained through asset value increase.
Investment income is flat taxed.
And inheritance taxes, which are very high in France.
If you want to increase taxes, consider taxing income more and capital gains at a progressive rate. Although I haven't seen good data on effects of say a 70% capital gain tax, might hurt th,e economy. I did some reading on this subject last month and the sweetspot was around 20% to 35% on that classification of income.
Do you want to take people's wealth and cap it? IE, nobody is allowed more than $5 million? What are you advocating for instead?
Would this actually cover France's deficit?
America's $6.75tn budget [1] would blow through our $140tn private wealth in 21 years. Even Norways $0.11tn budget [2] blows through its $1.6tn of private wealth in 14 years.
Perhaps the better metric is deficit as a fraction of private wealth? If that looks unsustainable, the problem is in publicly-held assets and services.
[1] https://fiscaldata.treasury.gov/americas-finance-guide/feder...
In the last 5 years French public debt has grown $750b [1]
Had that growth in wealth been taxed at the rate income was taxed (45%), that would have seen France's debt decrease - even with the covid mess.
[1] https://www.ceicdata.com/en/indicator/france/national-govern...