If we come to study the quality of democracy, one interesting dimension deals with the fact that representative democracy has traditionally promoted the pluralism inherent to contemporary societies. However, we sustain that the recognition of individual political rights is not a proper tool to guarantee the participation of individuals —on equal basis— in the conquest of power. Moreover, we argue that all political trends nurturing society are not equally represented. The key point of this discussion is outlined in the current article —focuses on the need of fostering institutional reforms, which should be able to preserve equality without rejecting distinct groups present in society. To this respect, one of the most outstanding reforms has to do with quota laws. In this context, on the one side, our paper analyzes the impact of quota laws on both the composition and legislative production in Mexico and in Argentina; on the other side, the paper compares the data and conclusions of our study in Mexico and Argentina to the cases of Chile and Uruguay, where there is no current regulation fostering women representation in parliament. Finally, our work casts light on whether public policies in those countries have implemented new rules.