2.- econometric estimations of gravity equations
									
... been able to provide THEORETICAL foundations for the gravity model/equation7 deriving gravity equations as a valid representation of a variety of different trade theoretical models8. This was/is, in fact, one of the reasons for the gravity models living a “second youth”. Theory was somehow developed ...
                        	... been able to provide THEORETICAL foundations for the gravity model/equation7 deriving gravity equations as a valid representation of a variety of different trade theoretical models8. This was/is, in fact, one of the reasons for the gravity models living a “second youth”. Theory was somehow developed ...