Fortunately, while some economists were pushing the idea of self-regulating, fully efficient markets that always remain at full employment, other economists and social scientists have been exploring a variety of different approaches. These include agent-based models that emphasize the diversity of circumstances; network models, which focus on the complex interrelations among firms (such as those that enable bankruptcy cascades); a fresh look at the neglected work of Hyman Minsky on financial crises (which have increased in frequency since deregulation began three decades ago); and innovation models, which attempt to explain the dynamics of growth.