Biographical note: Andrew W. Lo is the Harris & Harris Group Professor of Finance at the Sloan School of Management, Massachusetts Institute of Technology. A. Craig MacKinlay is Joseph P. Wargrove Professor of Finance at the Wharton School, University of Pennsylvania. With John Y. Campbell, they...

The experience of the Asian currency and financial crisis in the years 1997-8 encouraged economists to develop some open economy nonlinear macro models. Such models allow for nonlinearities – studying the effects of contractionary currency devaluation in contrast to the standard model of...