MaizieD I rrespond to you regulalry, so I am sure I have responded to you at least once, but I do not want to bore people by constantly saying the same thing.
You cannot tax people in isolation. Tax very rich people here and they will just move somewhere else. You only have to read the papers to see how these people have homes all over the world and constantly travel - and can change tax location at the drop of a hat.
You also need to take into account the kind of person who has the personality that makes money. There is so much more to it than just having a good idea and going with it. Most of the men, and it is motly men, so far, are the kind who just steamroller, walk over and flatten everything before them.
I worked in the energy industry, and met them. The head of my employer, a man who gave his life to engineering and public service took on Mrs Thatcher and won.
While the elcetricity industry was broken up into regional companies and generation of electricity was separated from distribution. The gas industry was nationalised as one national company that did everything from drill bit to burner tip. It was split later, after he retired, but a man like that today would be in the private sector and all the tax rules in the world would not touch him. He would just move to the USA, Middle East, Monaco, Switzerland.
Tax rules are fine if you can make them stick. They may work in countries that do not produce many very rich people anyway, but they also drive them away. They do not invest in countries with very high or punitive tax systems.