BENOIT MAHY is Associate Professor of Economics at the University of Mons-Hainaut, Belgium. He leads the Department of Economic Analysis and is a member of the Warocque Research Centre, University of Mons-Hainaut. He is a national correspondent of the Applied Econometrics Association. ROBERT PLASMAN is Professor of Economics at the Free University of Brussels (ULB) and Co-Director of the Department of Applied Economics of ULB (DULBEA), Belgium. He is also the general secretary of the Applied Econometrics Association. FRANCOIS RYCX is Associate Professor of Economics at the Free Univers...