Answer:
The correct answers are signaling argument; human capital argument.
Step-by-step explanation:
Salary levels are closely related to educational levels. The increase in workers' wages, also called private profitability of education, comes from productivity. This is acquired through the education system, learning in the workplace or ‘learning by doing’ and lifelong learning or ‘lifelong learning’.
Salary differences increase with the professional career. At age 55, the age at which an average worker reaches his highest level of income, an employee with a bachelor's degree receives a salary that is 2.3 times that of one with compulsory secondary education, while a graduate and a graduate in (Vocational Training) higher multiply their salary by 1.8 and 1.5, respectively.