What If: Two Aren't Enough

I missed most of a discussion this morning on Radio National but I think it was about families, being "more productive" and dual incomes. The jist of it was that we need to have dual income families to be more productive and provide for our families.

And it suddenly hit me - what happens when two incomes is not enough? Single income families sufficed for many years, now suddenly we can't survive without two. So, like all good capitalist practices where endless growth is the goal, how do we grow into the next phase? Is polygamy the next thing on the government agenda? Will it be lowering the age for children can work or perhaps making schooling only compulsory till primary?

Surely, like all crud policies bases on pure growth that there has to be a point when it's not sustainable. Question is, what happens when it hits?