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Magazine Expansión publishes yearly its list of leading 500 top companies in Mexico. Its cumulative probability sales distribution per employee (per capita) exhibits a two-class structure: a quasi-Pareto power-law in the higher part and an exponential in the lower part which is qualitatively similar to income and wealth distributions in many countries of the world. Therefore, we posit that the income in wages and salaries of many Mexican workers is correlated to the sales revenue per employee of their corresponding employer firms. The relatively small number of state-owned enterprises (SOE) in this list is due to the privatization of most of the Mexican SOE during the past decades. [ABSTRACT FROM AUTHOR]