Supporting Washington, D.C.’s ballot initiative 71, which would make marijuana legal in the nation’s capital, makes sense in terms of economics, safety, and fairness, according to Economics21. If the initiative passes on November 4, it would eliminate the criminal and civil penalties associated with personal possession, private use, and cultivation of marijuana — within limits (two ounces for possession, no use in public places, and six plants). In terms of safety, the infamous argument that marijuana…