Communism

That's fair, the graphic is intentionally being accusatory. Its purpose is to agitate, of course, and asking the viewer to question is the method. If you want to get into Marxist economics, I recommend Wage Labor and Capital as well as Wages, Price and Profit. These two combined are far shorter and less complex than Capital, so they are great for beginners if you decide to learn more.

I also have an introductory Marxist-Leninist reading list you can check out if you want to get a more thorough understanding of Marxism-Leninism in general.

You can simply look up the average labour-productivity per hour in a country and the average hourly wage in that country.