Yeah, I'm not in favor of a wealth tax, precisely because of the evasion problems (which France is experiencing). I think a better and simpler solution is to not have abnormally low capital gains rates. And did you know that someone who is wealthy, who owns stock worth millions of dollars, pays $0 federal income tax until they reach over ~$80K in qualified dividend income per year? It's absurd. Income should be taxed the same regardless of source. Maybe give a slight tax break of ~5% for long-term investing of, say, 5-10 years or more, but getting a ~20% tax break for investments only a year old is absurd.

Of course, the most effective wealth tax of all time was implemented centuries ago and is continuing to perform amazingly. I'm speaking of the elimination of primogeniture, which does an excellent job of breaking up multigenerational wealth (and thus largely prohibiting the establishment of a permanent nobility class).