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After a certian point, (with "billionare" being considered a placeholder for that point, even if exact values may vary) "Trickle down" runs into problems where you're making so much money, you buy everything you could want, and still be making money with the remaining money. {scrubbed}.
One orbital tourisim flight pays the salaries of countless middle class engineers, out of the pocket of someone who literally has more money than they know what to do with. {scrubbed}