Nowadays, growing income inequality is coming to the front because it is becoming a severe problem in developing and developed countries. We can find several periods when income inequality reached an enormous extent during history, and there is a similar phenomenon nowadays. The question is whether inequality exists but how large its size is. My paper aimed at finding the effect income inequality has on society. It is clear that while some people become rich in a society, others get into poverty, making society’s polarisation stronger. Latin America is one of the areas where inequality is very high can result in questions: how big inequality a country can cope with and to what extent it can disintegrate the society. Based on data analyses, we can conclude that due to the growth of social polarization middle-class decreased in the society. A decreasing middle-class evolved due to the different interests among the members of the society and political and economic decisions.