“…A longer annual schooling time can reduce educational inequality because children from all social classes share similar learning environments at school, benefit from similar learning opportunities, and thus make similar learning progress (Ammermüller, 2005;Schlicht, Stadelmann-Steffen, & Freitag, 2010). Preschool enrollment may equalize educational outcomes among children because children of low socioeconomic status, who often lag behind in their academic development, typically make greater developmental progress in preschool programs than their more advantaged peers (Burger, 2010(Burger, , 2013(Burger, , 2015(Burger, , 2016bCebolla-Boado, Radl, & Salazar, 2017). Finally, public expenditure on education is commonly thought to reduce educational inequality (OECD, 2012;Schütz et al, 2008).…”