Is it really the result of globalization, or could it be the capture of gdp growth by the wealthy? Thinking about it we tax productive work more then capital i

Is it really the result of globalization, or could it be the capture of gdp growth by the wealthy? Thinking about it we tax productive work more then capital investment, and I'm not sure if that isn't ass backwards. http://www.taxpolicycenter.org/briefing-book/what-effect-lower-tax-rate-capital-gains http://www.taxpolicycenter.org/briefing-book/what-effect-low...