Abstract
This paper presents evidence that returns to schooling in Libya are nonlinear. However, this evidence should not be taken as supporting the sheepskin effect. Although high-school graduation is associated with higher earnings over and above what is predicted by the linear model, other diploma years do not possess the same advantage when a spline function is used.When a step function is used, various years, some of which do not lead to a diploma, show high marginal returns.
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