[eng] Patrick Plane and Claire Salmon — Trade unionism and technical efficiency : a practical analysis to Bangladeshi firms. . The impact of trade union activity on the economic variables of firms has not been much studied, especially in developing countries. The authors of this paper attempted to apply econometric tests on the technical efficiency of a cross section of Bangladeshi firms by comparing those with and without trade unions. Estimates of a « parametric frontier model » between the two situations suggest a rather positive relationship. The statistically significant influence of trade unions however proves relevant only when considered in relation to firms predominantly owned by foreigners and in the overall context of econometric variables determining firm efficiency.