This is a NBER working paper in Jan 2014. Using data from the United States Census Bureau the authors find that there has been a rise in assortative mating, and assortative mating does contribute to household income inequality. Comparing to the baseline of randomly mating, the Gini coefficient in the assortative case is significantly higher (0.43 vs. 0.34 in 2005).
Comment: Em, see also in another express "Educational Assortative Mating"
Author: Jeremy Greenwood, Nezih Guner, Georgi Kocharkov, Cezar Santos
Link: http://www.nber.org/papers/w19829
Comment: Em, see also in another express "Educational Assortative Mating"
Author: Jeremy Greenwood, Nezih Guner, Georgi Kocharkov, Cezar Santos
Link: http://www.nber.org/papers/w19829