I agree - they are exercising the principle of opportunity cost. While most parents probably would make more than the $700 / month, the value might simply not be worth it.
I remember a study that concluded that in reality, there is a cap on how much additional money improves your day-to-day life. And if a family is already past that on one income, why do you need two?
I remember a study that concluded that in reality, there is a cap on how much additional money improves your day-to-day life. And if a family is already past that on one income, why do you need two?