they not examples of more desirable economic environments than here in the U.S.?
Here's an excerpt from the link I provided...
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Greenland, for example, has a flat tax, and at 45%, it is one of the world’s highest taxes. Nevertheless, Greenland has few of the social services that many developed countries have. Similarly, Mongolia and Kazakhstan have flat taxes of 10%, and Bolivia and Russia have flat taxes of 13%, yet these countries do not have well-developed social sectors. Hungary and Romania have flat taxes of 16%, and Lithuania and Georgia have flat charges of 20%. Many of the countries with flat fees have lower standards of living than the nations that surround them.
However, there are arguments in favor of a flat tax, one being that not taxing the rich at high rates incentivizes them to remain in the country and spend their money there. Imposing high taxes on the rich can cause them to set up offshore accounts in tax havens, as happened with The Beetles when the UK government taxed them at 95% of their income.
Many in the United States favor imposing a flat tax, at least in part, to encourage the rich to spend their money domestically rather than to keep it in tax havens. Others believe that not taxing the rich at rates higher than the poor will leave critical social institutions, such as schools and roads, underfunded.
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btw, I'm with the "Other" group.