A common phenomenon about transition economies is that the return to schooling improves as economic reform progresses. Existing evidence suggests that Vietnam is not an exception to the pattern. However, the rate of return for the period 1992 to 1998 is still low relative to that of the world...

We propose a new statistical instrument-free method to tackle the endogeneity problem. The proposed method models the joint distribution of the endogenous regressor and the error term in the structural equation of interest (the structural error) using a copula method, and it makes inferences on...