The multigenerational home was the typical living arrangement in mid-19th century America. A century later the multigenerational home was the exception rather than the norm.Yet, almost unremarked, several forces have combined over the past half century to reinvigorate the idea that multiple generations living together is a financially smart and emotionally rewarding choice.In the first of a two-part series for Minnesota Now, MPR senior economics contributor Chris Farrell examines a powerful economic and social trend that shows no signs of peaking.