 The gain is attributable to savings in expenditures on means-tested public benefit programs and an increase in sales and lodging tax revenue from weddings and wedding-related tourism.Another Williams Institute study conducted in February 2012 estimated that in the first three years after the law takes effect, Maryland same-sex couples will generate between $40 and $64 million for the state economy, in addition to whatever revenue out-of-state couples bring.Several dozen small employers in the state have also said that same-sex marriage will be good for their businesses, helping to attract and retain talent.