The term wage slavery has been used to describe this conundrum (which is mostly based on land ownership, and confounded through "school" and media which have effectively removed the ability to be self-sufficient from much of humanity).
In times past, you could go out and find food on the ground or in the trees, you could build shelter from sticks, hides, rocks, clay, etc., and you could drink water from wherever it flowed (though obviously that wouldn't always be clean)
Now, if you are born, or simply find yourself in an area, where the land is "owned", and thus you are "violating" someone else by eating the food on it, using the raw materials on it, building shelter on it, or drinking the water from it... How is that natural?
Without the illusion of "ownership" over the natural world, one could never keep another from eating food that Mother Earth has provided.
The main point of the argument (which I am simply explaining in the hopes of getting people to consider rather than disregard because it doesn't fit into their current beliefs) is that if all do not have access to the natural necessities of life because of the game of materialism, then they cannot simply live... They now have to "earn a living".