If technology makes the cost of supporting a person's life is nearly zero, then the wages they'll demand can also approach zero. So a human can undercut a robot

If technology makes the cost of supporting a person's life is nearly zero, then the wages they'll demand can also approach zero. So a human can undercut a robot worker on cost. Currently, that doesn't happen because humans are so expensive to maintain - they'd sooner starve to death than work for less money than they need to keep themselves alive. But it's more than before. We do have a huge tertiary sector of the economy which is basically humans being employed to do low-value or unnecessary work because they're so plentiful and cheap.