Merged firms are typically rather complex organisations. Accordingly, merger has a more profound effect on the structure of a market than simply reducing the number of competitors. We show that this may render horizontal mergers profitable and welfare-improving even if costs are linear. The...

We analyze the dynamics of neighbourhood watch programs in a local interaction framework. Agents can watch their neighbours' houses and thus deter burglars from breaking in. At the same time, agents also try to recruit their neighbours to join the neighbourhood watch program. The probability of...