Same-sex couples have been getting married for five years now in Massachusetts. Gary Gates of UCLA's Williams Institute has done the number-crunching and identifies intriguing economic benefits.
"Data from the American Community Survey suggest that marriage equality has a small but positive impact on the number of individuals in same-sex couples who are attracted to a state. However, marriage equality appears to have a larger impact on the types of individuals in same-sex couples who are attracted to a state. In Massachusetts, marriage equality resulted in an increase of younger, female, and more highly educated and skilled individuals in same-sex couples moving to the state... The evidence that marriage equality may enhance the ability of Massachusetts to attract highly skilled creative class workers among those in same-sex couples offers some support that the policy has the potential to have a long-term positive economic impact."