We study the influence of social networks on labour market transitions. We develop the first model where social ties and job status co-evolve through time. Our key assumption is that the probability of formation of a new tie is greater between two employed individuals than between an employed...

This paper studies the dynamics of fundamental research. We develop a simple model where researchers allocate their effort between improving existing fields and inventing new ones. A key assumption is that scientists derive utility from recognition from other scientists. We show that the economy...