Infrastructure networks -- in communication and transport -- are a key feature of an economy. The functionality of these networks depends on the connectivity and sizes of different components. However, these networks face a variety of threats ranging from natural disasters to intelligent attacks...

Systemic risk - the possibility that an individual firm's failure will result in broad damages to the economy as a whole - is the epitome of financial crisis. Bailouts of troubled firms have long been the standard response to systemic risk. Yet, bailouts suffer from problems of political...

Voluntary military alliances, such as NATO, are often criticized for failing to exploit the opportunities for equipment standardization and free trade. However, nationalism means that governments adopt a variety of industrial policies for purchasing defense equipment, leading to departures from...