> Money belongs to people, and those people don't tend to move.
The tax isn't for their money, it's for their capital gains, which only happen when they realize those gains (e.g. sell assets). High net worth individuals absolutely can and do move to lower tax areas if the incentive is sufficient, or otherwise choose not to move to higher tax areas. It happens between US states all the time.
> Heck, the US is especially good at taxing people abroad.
Has it improved significantly since 2014 [1]?
> How many would really renounce citizenship just to save on taxes, and where would they go that taxes less?
Perhaps somewhere other than Canada, France, Holland, Denmark or Sweden, and without renouncing their citizenship.
There seems to be this idea that simply because the IRS tax rules apply to expatriates, that everyone bends over backwards to report their incomes and pay their taxes the same way they would in the US. I just haven't seen evidence that's the case--particularly among high net worth individuals leaving for that purpose.
And regardless, ideally our rates would be competitive and investors should want to put their money here. A "where else are you gonna go" attitude only works while there aren't better options, which may not be forever for all taxpayers.
[1] https://www.forbes.com/sites/procedurallytaxing/2014/11/18/i...