' productivity. This effect is larger for those firms with access to bank credit and investment opportunities than for firms that …. The relevant parameters indicating a positive effect of bank credit to productivity are consistent between estimation …

"The authors follow the Hellerstein, Neumark, and Troske (1999) framework to estimate marginal productivity … differentials and compare them with estimated relative wages. The analysis provides evidence on productivity and nonproductivity … training on wages and productivity differentials. Higher education yields higher productivity. However, highly educated workers …