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<p>Someone might use job and career prospects as a tiebreaker between two majors which s/he is equally interested in. For example, someone may be equally interested in chemistry and chemical engineering, but notices that the job and career prospects are much better for chemical engineering and chooses the latter.</p>
<p>Also, someone majoring in something where the job and career prospects are not that good may be more concerned about avoiding student loan debt.</p>
<p>But job and career prospects should not be the only reason to choose a major. You actually have to like and be good at it to be most effective in school and career.</p>