, Economic Theory, Vol. 8, No. 2, pp. 307-319, 1996 (lt;a href=quot;http://ssrn.com/abstract=1083168quot;gt;http://ssrn.com/abstract … Finance, Vol. 1, Issue 4, pp. 57-76, October 1991;(lt;a href=quot;http://ssrn.com/abstract=1082940quot;gt;http://ssrn.com/abstract …