In a nutshell, then, what you just said ties into what I was saying earlier. At the end of the day, those who leave the labour force will be the ones who can choose to do so. When one spouse makes $80,000, $90,000 or $100,000 a year, the other spouse has the flexibility of choice. If both people in the couple make $30,000 each or if one earns $40,000 and the other earns $30,000, they won't necessarily have any choice, especially if they have a family and mouths to feed.
On April 28th, 2015. See this statement in context.