"If Karl Marx was searching for the most profitable example to illustrate his theory of surplus value, he would select the exploitation of Cuban workers by the socialist State in complicity with foreign capitalist firms. In numerical relative terms, the worker receives approximately less than 3% of what the foreign enterprise paid for him to the official Cuban Employment Agency."
Read Foreign Investment in Socialist Cuba, prepared by José Álvarez, Ph.D., Emeritus Professor, University of Florida for The Foundation for Human Rights in Cuba.