While there is a big literature on the benefits of pre-school education, only little is known why kindergarten attendance improves later-life outcomes. This is partly because most studies analyze the effect of complete 2 years pre-school programs. In order to shed light into the black box of...

We analyze the causal effect of education on old-age cognitive abilities using German Socio-Economic Panel (SOEP) data and regional variation in mandatory years of schooling and the supply of schools. Our outcome variable is the score an individual reaches in an ultra-short intelligence test. We...