**0034–6764/0901 –288/$ 1.50/0.
**An earlier version of this paper was presented at the History of Economics Society Conference in 1989. I am grateful for useful comments from an anonymous referee and Nahid Aslanbeigui.
Notes
**0034–6764/0901 –288/$ 1.50/0.
**An earlier version of this paper was presented at the History of Economics Society Conference in 1989. I am grateful for useful comments from an anonymous referee and Nahid Aslanbeigui.