Wage is one of the most important factors in motivating employees. Because wage depends on a variety of determinants, the existence of the wage gap is inevitable. According to economic theory, the wage gap can be decomposed into two main components. The first component is due to the difference in endowments of the workers. The second one is due to the difference in the coefficients or due to market returns to the endowments. The second component is statistical evidence of discrimination that can lead to inequality in society.