The document discusses key concepts related to human development and inequality, including the Human Development Index (HDI), Gini Index, and Index of Human Development Adjusted by Inequality (IHDI). It also provides country-specific information about HDI and inequality in Mexico. According to the report, Mexico's HDI ranking would be 12 places lower (at position 89) if adjusted for inequality using the IHDI, as inequality lowers the average achievements in health, education and income across the population. The document stresses that inequality remains an issue in Mexico that hinders sustainable development.