We report results from a large-scale, pre-registered randomized field experiment in 159 Norwegian schools over four years. The intervention includes students aged 7-9 and consists of pulling students from their regular mathematics classes into small, homogenous groups for mathematics instruction...

Advances in economics result from new ideas, but economists have no formal tools to generate such ideas. Yet logical processes for idea generation exist and can be applied to economic theorising. If an economic problem is reframed as a proof problem, economists can use familiar logical tools to...

"In this paper we nonparametrically analyze the effects of reallocating individuals across social groups in the presence of social spillovers. Individuals are either 'high' or 'low' types. Own outcomes may vary with the fraction of high types in one's social group. We characterize the average...