“…Some studies have also investigated the effects of technological changes on 1 Econometric studies of production risk in agriculture using a primal model approach include Antle (1983), Antle andGoodger (1984), Di Falco et al (2007), Groom et al (2008), Griffiths and Anderson (1982), Kumbhakar (1993), Just and Pope (1979), Nelson and Preckel (1989), Regev et al (1997), Roberts et al (2004), Serra et al (2006), Traxler et al (1995) Wan and Anderson (1990), and Wan et al (1992), while aquaculture has been studied by Asche and Tveteras (1999) and Tveteras (1999Tveteras ( , 2000. 2 The state contingent approach (Chambers and Quiggin, 2001) has been introduced as an alternative to the traditional parametric stochastic production function approaches such as the Just-Pope specification belongs.…”