For decades, the art world and the general public have viewed artists and arts activity as compartmentalized into three separate spheres. In the commercial sector, artwork is organized by forprofit organizations and marketed by selfemployed artists and companies in a hotly competitive and highly segmented marketplace. In a nonprofit sector that has rapidly expanded since the 1970s, the work of artists and arts organizations is mission-driven and motivated by factors other than financial return, relying heavily on patronage and philanthropy. In the community sector, artwork is rarely remunerative but pursued for cultural, political and aesthetic reasons.