Earnings Equations Establish a Relationship Between an Individual's Earnings and Its

Earnings equations establish a relationship between an individual's earnings and its determinants such as years of education, tenure with an employer, IQ of the individual, professional choice, region within the country the individual is living in, etc. In addition, binary variables are often added to test for "discrimination" against certain sub-groups of the labor force such as blacks, females, etc. Compare this approach to the study in the textbook, which also investigates evidence on discrimination. Explain the fundamental differences in both approaches using equations and mathematical specifications whenever possible.