“…We also tested a model where the inefficiency term is not fixed over time, so that we get time- 1984, 19931986, 19991986, 19941986, 199719961997Maxima 1985, 20011983, 1993, 20021991, 20011985, 1994, 20011981, 20021985, 1991, 2001 * Estimated by using a Cobb-Douglas-production function with Harrod-neutral technological progress. ** Cf.…”