4. If the working class earned their fair share, you would have more of the money going to more people and get more spending out of that portion of the population who still have a lot left to buy.
I actually think the old school way of workers forming unions and negotiated a deal with the "evil" capitalists gets a far better deal than government mandated minimum wages, etc. I also don't think government inspired wealth redistribution inspires healthy innovation. Many nouveau riche deserve to be rich and some of their contributions are so good, they should be able to ensure that their descendants get some advantages too.