The Blank 1 Question 13 argued that education by itself does not contribute to a person's productivity. Blank 2 Question 13 claimed that people supported by their parents were willing to invest in their own education so that they would be able to earn a higher income in the future. In both advanced and developing countries, studies about the Blank 3 Question 13 confirmed that investments in education had a positive influence on growth, led to higher productivity and economic development. Employers use educational qualifications and diplomas as a screening system for ability, achievement motivation, social background, and the right personality traits according to the Blank 4 Question 13 . Human Capital Theory Screening Theory