Bacha Edmar Lisboa author Sachs Jeffrey D. author Columbia University. Earth Institute Columbia University. Economics Columbia University. International and Public Affairs Columbia University. Health Policy and Management Bell David E. author Birdsall Nancy author Columbia University. Earth Institute originator text Articles 1989 English Economics 118 1 203 210 1989 http://hdl.handle.net/10022/AC:P:8358 NNC NNC 2009-09-04 10:34:41 -0400 2011-10-07 11:14:40 -0400 339 eng