„There is mounting experimental and quasi-experimental evidence that larger classes are detrimental for educational outcomes. […] Larger classes in upper primary school (age 10 to 13) are detrimental for cognitive test scores at ages 13 and 16, and for wages and earnings at age 27 to 42.“
Univ.-Prof. Dr. Peter Fredriksson u. a., „Inside the Black Box of Class Size“ (2014), S. 2f
