„The recent quasi-experimental literature that relates school spending to student outcomes overwhelmingly support a causal relationship between increased school spending and student outcomes. […] Importantly, this is true across studies that use different data-sets, examine different time periods, rely on different sources of variation, and employ different statistical techniques. While one can poke holes in each individual study, the robustness of the patterns across a variety of settings is compelling evidence of a real positive causal relationship between increased school spending and student outcomes on average.“
Univ.-Prof. Dr. C. Kirabo Jackson, Does School Spending Matter (2018), S. 13f.