Will the growing acceptance and legalization of gay marriage have a noticeable effect on businesses that cater to those engaging in the joyous event, such as The Knot (NASDAQ:KNOT) and engagement-ring purveyor Blue Nile (NASDAQ:NILE)? What about others that help marriages get off to a good start, like 1-800-Flowers.com (NASDAQ:FLWS), travel portal priceline.com (NASDAQ:PCLN), and hotel company Marriott (NYSE:MAR)?

A Washington Post article this week looks at how small businesses might benefit:

On Friday, [D.C.] Mayor Adrian M. Fenty (D) signed legislation to legalize same-sex marriage in the District, a move that is expected to be a financial boon for the city and for vendors such as [flower shop proprietor Robin] Sutliff, who make much of their money on weddings but who have struggled during the recession. District officials surmise that the regional economy could reap up to $22 million over the next three years as couples from Washington and elsewhere take advantage of the new law.

Obviously, small flower shops aren't publicly traded companies. But there's reason to believe that bigger companies might benefit as well.

So what do you think? Does gay marriage matter on Wall Street? What other social and political trends should investors be keeping an eye on as potential profit opportunities?

Sound off in the comments box below. For each post, the Fool will donate $0.10 to the Thurgood Marshall Academy in Washington, D.C., in furtherance of financial literacy.

Fool online editor Kris Eddy owns no shares of any stocks mentioned in this article. The Knot and Blue Nile are recommendations of Motley Fool Rule Breakers. priceline.com is a Motley Fool Stock Advisor pick. Try any of our investing newsletters free for 30 days. The Fool has a disclosure policy.