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<p>The poorest ROI (for both the student and the school/state) is probably biology, at least for the majority of students who do not get the medical-school-minimum GPA of 3.6 or so. Teaching biology requires labs which are more expensive than just lecture and discussion, but the job and career prospects at the bachelor’s degree level are comparable to humanities and social studies (not economics).</p>
<p>Yet, somehow, biology is the most popular major at many schools.</p>
<p>However, industries and the economy as a whole go through economic cycles, changing what graduates in many majors find in terms of job and career prospects.</p>