if you could make $20 an hour bagging groceries there would be no reason to better yourself and actually contribute to society, people would just choose the easiest way of life. There would be nobody to fix the roads or maintain public transportation when they break down.
If there were no monetary restrictions holding you back from pursuing higher education, or no monetary risk in training employees to do a different job, who would want to stay at a grocery store for the rest of their life? Humans naturally take on more strenuous tasks if it gives them purpose, such as maintaining public facilities and roads that everyone uses. Innovation comes from uninhibited brainstorming, and the more people that are able to contribute to society and innovation without their income or class status holding them back, the more innovation will arise. Low-skill jobs (monotonous horsestuff that nobody would willingly stand doing for their entire lives) would be used as temporary positions, transitional if you will, or automated.
Are you so sure about this? A misguided and useless attempt at wealth distribution to a people who won't spend that money in the first place is probably just about as harmful as rich folk amassing large amounts of net worth. Now you have a pissed off 1% and a starving, disenfranchised people.
The redistribution isn't some simple "steal money, evenly divide it among the masses" scheme as you are imagining it. It's a complete overhaul of the functioning of society, and the initial redistribution of wealth kickstarts that system by "funding" this overhaul. It is the tearing down of classes and the redistribution of power. Every man would be given the power to more directly engage in the democratic process, not through the proxy of a legal team and a council of politicians with separate interests. They would be given the power to more directly reap the benefits of what they create.
if you think you are more valuable than that, than loving show it. stop being a bag boy.
Alright, here's a scenario: you're born in the rural south, bumforget nowhere in the mountains. The nearest supermarket that's still hiring is 5 miles away, and you don't have a car. You dropped out of school because of the intensely inadequate education in your area and the dangerous culture of resorting to cheap (dangerous) addictive substances among 'students' of your age, because there's literally nothing else they can afford to do. You get up every morning, walk 2 miles to a bus stop and arrive at work, put in a 9-5 shift, and go home. You ask for a raise or a promotion, and the manager tells you to forget off because you haven't gained any skills from bagging groceries, thus being no more useful to the company. Maybe if there was some people who were able to spend more money at that grocery store in the area, your boss would be willing to spend the resources to train you, help you move up the minimum wage hierarchy. You fall in love with a girl, start a family in a trailer, and your kids end up dropping out of the same unhelpful, deteriorating school that you did. Where's your bootstraps?