hijinx
On a slightly more emotional side:
With individual productivity increasing annually, it's a shame that individuals are not seeing proportional wage increases in return.
And none of that even touches upon the reality that those making the billions are rarely those with exceptional talent or skill. It's those who had the connections and financial wherewithall to build networks that are unreachable for those born into lower socioeconomic circumstances. No, I don't have data for that, but a simple unscientific survey of Execs making hundreds or thousands of times more than their employees are rarely from anything less than middle-upper class backgrounds, and most often have family money that allowed them opportunities never imaginable to lower rungs of society.
I do not like the idea of paying higher taxes, but I also recognize that individuals and companies are sitting on trillions upon trillions of dollars because they are making so much money that they can't spend it all. Just ask Bill Gates or Warren Buffet, both who agree with this and argue for higher taxes.
But emotions aside, it's simple economics. When social mobility is poor and inequality high, there simply aren't enough consumers to support the level needed for a country to remain 'first world'.