Illicit trade
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Sung, H.Y., Hu, T.W., Keeler, T.E. 1994
Becker, G.S., Grossman, M., Murphy, K.M. 1994
Baltagi, B.H., Levin, D.E. 1992
Chaloupka, F.J., Saffer, H. 1992
Jensen, R., Thursby, J.G., Thursby, M.C. 1988
Baltagi, B.H., Levin, D.E. 1986
Bhagwati, J., Hansen, B. 1973