>I came across this today and thought I'd toss it into the ring of ideas.
>
>Inequality has exploded the past 30 years, because of the usual suspects: technology, Wall Street, Harry, and Sally.
>
>Okay, it probably isn't fair to blame Billy Crystal and Meg Ryan for our widening income gap. But it is fair to say that When Harry Met Sally tells us something about why the rich have been getting so much richer than everyone else. That's high-earning college grads marrying each other—which a new paper estimates has increased inequality by 25 percent.
>...
>http://www.theatlantic.com/business/archive/2014/02/how-i-when-harry-met-sally-i-explains-inequality/283517/

Great movie.
Boy, do I miss Nora Ephron!
That said.. no real surprises here.
Since the beginning of time marriages have been more common between members of the same social, political and economic strata and the effect has been to concentrate power and wealth.