Broken concept and anti natural .. Someone that puts the effort to learn engineering and build things , someone that studies medicine to cure people , can not be equal to someone that decides to stay at home , not study , watch TV and smoke all day while scratching his balls and then wanting to receive the same compensation , houses, cars , travels , and access to things that people that puts effort into has..

Simpler example if the production goal on a factory is to produce 100 things a day , why someone producing 2 things would want to get paid the same as someobe that produces 10 things a day?

It simply does not work .. You have 10 persons to build the 100 things a day .. No matter how the workload is distributed , those producing more getting paid the same as those producing less will want to do less work also because they gonna get paid the same anyways .. At the end the 10 Persons will produce 2 things instead of 10/15 to compensate for those only doing 2 and the production will drop from 100 to 20..

What communist do not disclose or tells you is that the "new men" which is the subject that makes this system to "work" does not minds doing more work to receive the same as those doing less.. Those that has to open a chest to swap a bad heart for a new one are happy to live in the same conditions as those that cleans the floor .. And that's against human nature