Research by Eric Hanushek and others suggests that increasing the number or quality of teachers will

Question

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Research by Eric Hanushek and others has shown that while increasing the number or quality of teachers can lead to improvements in student test scores, the benefits tend to diminish over time, leading to increases by ever-decreasing amounts. This concept is related to the principle of diminishing returns, where after a certain point, each additional input (in this case, teachers) yields smaller and smaller improvements in output (student test scores).

Research by Eric Hanushek and Others Suggests That Increasing the Number