Lets just say if some people did not have money, they would be as useful as a wet tissue.
If I didn't have money, I could offer my skills to barter for other goods or services. This is what money fixes, it creates a field where everyone can play on.
The problem is when all your skills and what you have to offer gets automated by machines that are 100000% more efficient and cheaper than you.
Well not really, someone must make those machines. Someone must maintain those machines. The only reason we simplify these tasks is to move on to other tasks.