Someone must transform income into the food, shelter, clothing, nurture, discipline, education, minding, nursing, transportation, and emotional support that creates life outside of the office, permits survival of the race, cares for the ill and disabled, and makes life livable when we can no longer care for ourselves.
Just as Darwin discovered the law of development of organic nature, so Marx discovered the law of development of human history: the simple fact, hitherto concealed by an overgrowth of ideology, that mankind must first of all eat, drink, have shelter and clothing, before it can pursue politics, science, art, religion, etc.