NC Fourth Sector Resource ProjectA fourth sector business is one that has the social or environmental mission of a non-profit, while getting a significant portion of its revenue through earned income. Goodwill Industries is a commonly-recognized example. TROSA, Piedmont Biofuels, Redwoods Group, Bark House, PTA Thrift Shop, Bountiful Backyards, Triangle Ecycling and DERC are just a few of the many great North Carolina fourth sector businesses.