What about services provided for free? Obviously for a given population if twice the number decide to work, since there are no extra people to generate twice the demand, the real income per job will halve. It's a self fulfilling prophecy "that everyone will be better provided for in that case" because now a single household DOES require two incomes to maintain its standard.
Since free services never earned anything to start with would continuing on deprive anyone of employment?
..confused