It sounds like you haven't really done the math here. Nobody is a billionaire from having a shop with a few employees, Amazon and Walmart have over 1.6 million and 2.3 million employees, respectively. Bob McCEO going from 400,000/month to 200,000/month and spreading the difference among all the employees comes out to like 8-12 cents per employee for the entire month, or a little over a dollar for the year. The CEO could work for free and give his entire salary to the employees, and that would be like an extra $2 for the year for everyone. There is no amount you can reduce the CEO salary to pay the other employees a noticeable amount more because the CEO salary already isn't even a noticeable fraction of the labor costs.
Several of the jobs you mentioned aren't even minimum wage jobs. Truck drivers definitely don't make MW, and neither do bank tellers or amazon employees. MW wage jobs are just that, they are the minimum skill and responsibility a job can have, so saying "if they walked out" isn't even a hypothetical, MW employees no show, oversleep, get high and don't show up or walk out all the time. They're the easiest to replace.
The corporations things isn't really that relevant either. The work is the work and the pay is similar regardless of who it's for. A cook at a fast food place pays the same as doing the same thing in a school cafeteria, but one of them taco bell writes the checks, and the other the school district writes the checks.
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Lolwut? I though it was pretty clear that the $18k GDP per capita was in response to your "plenty for everyone". That is the impossible MOST everyone would make IF everyone was paid the same, so since they aren't, it necessarily implies that some people have to make less than that because some people make more than that. It is the impossible most because of course nobody would open any businesses in the first place if there was no upside in doing it. Thankfully there is incentive to do it, so people do.