This paper evaluates and analyzes the effects of labor contracts on shirking in Cameroonian firms. This study uses the survey data collected in 2006 in Cameroonian manufacturing firms having more than 15 employees. Data processing produced a sample of 65 companies and 1809 employees. In addition to permanent or temporary distinctions, we considered the verbal aspect of labor contracts, affiliation to social security and promotion within the labor market. Econometric estimations take into account the endogen…