In these cases, the most informative indicators for gender inequity are differentials in primary education, access to credit and property rights. Some of these studies focus on long-term determinants of productivity growth and supply, while some of them model the maximization of producers' profits based on the selection of a suitable level of human capital, whose availability is reduced by the failure of potentially productive people to enter the market (Esteve-Volart, 2004). These studies take the non-inclusion of women in employment as a distortion that reduces the total sum of talent, in the case of employees, and lowers productivity, in the case of unequal access to technology and other production resources (Blackden and others, 2007).