Question

College graduates earn much more, on average, than high school graduates. Research done in the US finds that high school grads over an adult's working life earn an average of $1.2 million, associate's degree holders earn about $1.6 million, and bachelor's degree holders earn about $2.1 million. According to economists, this difference in earnings is mostly due to __________________
a) compensating differentials
b) having network connections
c) differences in human capital
d)luck

Answer 1

(C) is the correct answer. What's difficult about it? Each term is explained in Wikipedia.

Answer 2

human capital

Answer 3

Definitely C human capital.