"Which theory of education argues that a high school diploma or college degree becomes a signaling device that matters more for predicting later attainment than what the student learned in school?

credentialism theory

Explanation:

Credentialism theory argues that high credentials, higher degree and more qualification means there is  more chances to get social and earning benefits. It also argue that high credentials develop skills and market demanded human resources skills that helpful to live and get successful life.  In high diploma every one compete to get high credentials so they can earn more money and social status.

speed

explanation:

answer; vygtosky's theory;