00750nls0 2200265 450 00000911220180416120455.01872-689520080303a1973----km-y0itay50------baengsa------0xx-vr-----------Journal of econometricsrisorsa elettronicaAmsterdamElsevier[1973]-risorsa on linerisorsa on line001000001170EconometriaITUNIPARTHENOPERICAUNIMARChttp://www.sciencedirect.com/science/journal/03044076000009112Download full text 1995-NAVA1Journal of econometrics793772UNIPARTHENOPE