TY - JOUR AU - Babcock,Philip AU - Betts,Julian R. TI - Reduced-Class Distinctions: Effort, Ability, and the Education Production Function JF - National Bureau of Economic Research Working Paper Series VL - No. 14777 PY - 2009 Y2 - March 2009 UR - http://www.nber.org/papers/w14777 L1 - http://www.nber.org/papers/w14777.pdf N1 - Author contact info: Philip S. Babcock Department of Economics 2036 North Hall University of California, Santa Barbara Mail Code 9210 Santa Barbara, CA 93106 Tel: 805/893-4823 Fax: 805/893-8830 E-Mail: babcock@econ.ucsb.edu Julian Betts Department of Economics, 0508 University of California, San Diego 9500 Gilman Drive La Jolla, CA 92093-0508 Tel: 858/534-3369 Fax: 858/534-7040 E-Mail: jbetts@ucsd.edu AB - Do smaller classes boost achievement mainly by helping teachers impart specific academic skills to students with low academic achievement? Or do they do so primarily by helping teachers engage poorly behaving students? The analysis uses the grade 3 to 4 transition in San Diego Unified School District as a source of exogenous variation in class size (given a California law funding small classes until grade 3). Grade 1 report cards allow separate identification of low-effort and low-achieving students. Results indicate that elicitation of effort or engagement, rather than the teaching of specific skills, may be the dominant channel by which small classes influence disadvantaged students. ER -