In my business career I have met 5 billionaires - all in technology. For the most part I found dealing with them to be the same as other business folks. In my dealings they were ethical.
tl;dr I am good with them having the wealth they earned. But after they pass I think it should be taxed at a MUCH higher rate. I have a real issue with inheritance and generational wealth accumulation - these go against the fundamental principles of capitalism.
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As to the morality of having so much wealth - this is really a question on the morality of capitalism. First let me say I believe capitalism is the best of a suboptimal series of choices for how to maximize human endeavors. The majority of people are intrinsically motivated by the rewards of “winning” and we are inherently selfish. It also is the “fairest” method for rewarding those who work hard and those who have unique talents. Capitalism maximizes those - which accelerates human progress better than any other economic system.
Is it moral to take a dollar more than you need when your fellow man goes hungry? I suppose it is less moral than giving away that dollar, but it also isn’t immoral IMO to be rewarded for your contributions and it isn’t immoral to recognize that human progress is important to the survival of the species. Virtually everyone on HBOT, me included, does so. I am a capitalist because I believe it is the only system that is workable - however flawed it may be.
So is there a dollar amount where it becomes “so immoral” that we should condemn it? I think any $ cutoff is arbitrary and capricious. If we say it is fine to have a second vacation home, what about a third? What about the extra money to take the family on vacation? It is too hard IMO to find that line. Plus it acts as a disincentive on human progress and could rightfully be viewed as unfair when others don’t work as hard or aren’t as talented.
Instead, I would focus on what happens to that money on inheritance. If we want to truly honor the ideals that hard work+ talent gets more reward then why do we allow for trust fund kids? If the US wasn’t massively in debt with people in economic insecurity I wouldn't care, but we are. And yet there are trillions in wealth held by a handful of people. Once they pass on I think a much larger percentage of that wealth should be taxed. The dead don’t need it and their descendants did not earn it.
I personally have been lucky to earn enough wealth that my future grandkids would be able to live a full life without lifting a finger - and that is wrong, they did nothing for it. That’s why I’m good with my fellow citizens taking much of it when I pass.
In other words a wealth tax is, IMO, the best mechanism for honoring the principles of capitalism while also fixing our fiscal challenges.