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This dissertation investigates the association of operating leverage with stock returns, the value premium, and the profitability premium. Results in the first essay support the hypothesis that operating leverage is related to stock returns and the value premium across the sampled countries. Results are robust to cross-country differences, typical controls, multiple definitions of operating and financial leverage, and while controlling for the endogeneity of operating and financial leverage. This suggests that the rational explanation for the presence of the value premium lies in the underlying risk exposure of fixed asset risk of operating leverage which is expressed through the value premium. Results further support the hypothesis of strengthening labor protection increasing operating leverage. In turn, increased labor protection marginally negatively associated with the value premium, suggesting that labor protection reduces the value premium through financial leverage. However, because operating and financial leverage are oppositely affected by employment protection, the joint effect of this association may be cumulatively washed out in estimating value premium with employment protection legislation.
Results in the second essay further support the hypothesis that operating leverage is related to stock returns and additionally support the hypothesis of operating leverage being associated to the profitability premium. The profit premium tends to be insignificant when generated within operating leverage portfolios, and the profit premium only tends to be significantly positive in the higher operating leverage portfolios. Furthermore, once operating leverage and profitability are orthogonalized from one another, the estimated coefficient of profitability is reduced by a magnitude of roughly 10. These results provide evidence in support of the profit premium being based on the riskiness of the firm through operating leverage, and therefore the profit premium is a rationally priced risk factor in stock returns.