Why has increasing teacher pay not led to a corresponding increase in teacher skills? Vanderbilt University economist Dale Ballou has an answer. Simply put, even when schools are offered highly-skilled teachers, they don’t seem to want them. Writing in the Quarterly Journal of Economics, Ballou demonstrated that many of the most attractive teaching applicants—those who graduate from more competitive colleges, earn higher GPAs, or hold degrees in specialized areas such as math or science—schools often reject them in favor of less-impressive candidates who took the traditional route of majoring in education. An education degree was generally preferred even for applicants preparing for a secondary-school position. . . .
Ballou and fellow economist Michael Podgursky of the University of Missouri have shown that higher pay without reforms could actually lower teacher quality. Their argument starts with the observation that increasing pay reduces the number of job openings (because fewer teachers will quit or retire), and increases the number of new applicants (because the salary is more attractive). This necessarily lowers the chance that any given teaching applicant will receive a job offer.
That reduced probability may discourage certain would-be applicants from making the costly investment of time and money in becoming certified for teaching, especially if they do not perceive that schools favor them in the hiring process. And, unfortunately, the best-qualified applicants are probably most discouraged.