The present thesis consists of seven papers specifying and analysing models of direct-interactions-driven collective economic phenomena. Within theories and models of coordination in large decentralized market economies (and analogously also within theories and models of coordination in natural...

We exploit a rich administrative panel data-set for cohorts of Economics students at a UK university in order to identify causal effects of class absence on student performance. We utilise the panel properties of the data to control for unobserved heterogeneity across students and hence for...

Countries often spend billions on university research. There is growing interest in how to assess whether that money is well spent. Is there an objective way to assess the quality of a nation's world-leading science? I attempt to suggest a method, and illustrate it with modern data on economics....