Chapter 8, Problem 9P

To determine

(a)

To explain:

The reason behind wearing a suit is a weaker signal of ability than the educational achievement.

To determine

(b)

To explain:

The reason behind some majors in colleges provide more powerful signals for future employment.

To determine

(c)

To explain:

The reason behind a double majoring provides a more powerful market signal that having a single major.

To determine

(d)

To explain:

The reason for students can be said to overinvest in grades than in learning course material