I was going to reply to Ted Winslow on this subject. But to my deep embarrassment (given the culture of not only the internet but academia, that is) I found that I agreed with everything he said, except maybe the way he crossed his ts and dotted his is. Jim Devine jdevine at popmail.lmu.edu & http://clawww.lmu.edu/Departments/ECON/jdevine.html