Analysis of a survey of the 1998-99 and 1999-2000 seasons for the same 100 smallholders in the Makhathini Flats region of KwaZulu-Natal shows that Bt cotton has performed better than other varieties. Having two years of data for the same farmers allows innate efficiency differences, due to...

Previous empirical works on municipal efficiency have mostly used cross-sectional data which makes it impossible to separate unobserved heterogeneity from inefficiency. Furthermore, they have also typically used a two stages approach which has been widely criticized as the assumptions made in...