One-earner married couples tend to gain relative to either two-earner couples or individuals.
单职工夫妇往往比双职工夫妇或个人获益更多。
2
I'm speculating, but it seems reasonable to me that what's causing this decline, or much of it, is the rise of the two-earner household.
我猜测，双职工家庭的日益增多导致了迁移率下降或者是大幅下降，但是对于我来说，这似乎是合乎情理的。
3
In all but one of 30 OECD countries, a married one-earner couple with two children takes home more money than a single person with no children on the same average annual salary.