It is obtained from regressions of log wage on age, highest level of education, years of experience in the firm and their square, employees in the firm, geographical location of the firm, type of financial control, level of wage bargaining, type of employment contract, number of overtime hours paid, occupation, and gender and their interactions with gender. See the text for the technical details. The figure depicts the simple average of OECD countries which belong to the European Economic Area and for which data are available.