“Without nonbanks, today’s sluggish mortgage market would be much less vibrant,” according to research released this week by two researchers associated with Harvard University. Their working paper stresses that implementing bank-like standards for nonbanks isn’t the best strategy to mitigate risks in the housing finance system. The paper was authored by Marshall Lux, a senior fellow of the Mossavar-Rahmani Center for Business and Government, which is part of the John F. Kennedy School of Government at Harvard University; along with Robert Greene, a research assistant at the same center. They called...