We consider an environment in which participants make payments over a network and can invest in a technology that reduces the marginal cost of using the network. A network effect results in multiple equilibria; either all agents invest and usage of the network is high or no agents invest and...

This study investigates the concept that, although a large population is often regarded as a prerequisite for innovation, less populous regions can actually compete in more mature technological fields.Thick markets and knowledge spillovers make populous regions more conducive to innovation, but...

Legislators are calling for a “systemic risk regulator”, in part to provide an early warning of financial conditions that threaten the real economy. To succeed, however, we need a forward-looking measure of systemic risk. Even more, we need a measure that varies with “pollution” from...

Modeling -- Foundation -- A model economy -- What is money? -- Money and the level of economic well-being -- Money in a classical economy -- Money in a Keynesian economy -- Should monetary policy be active? -- Is monetary policy active? -- Measuring monetary services -- Organizing the production...