We study the impact of international long-distance flights on the global spatial allocation of economic activity. To identify causal effects, we exploit variation due to regulatory and technological constraints which give rise to a discontinuity in connectedness between cities at a distance of...

We study the impact of international long-distance flights on the global spatial allocation of economic activity. To identify causal effects, we exploit variation due to regulatory and technological constraints which give rise to a discontinuity in connectedness between cities at a distance of...

Tall buildings are central to facilitating sustainable urbanization and growth in cities worldwide. We estimate average elasticities of city population and built area to aggregate city building heights of 0.12 and -0.17, respectively, indicating that the largest global cities in developing...

Demographic change brings complex challenges to the economic, social, and environmental systems of cities, with its asymmetric, overlapping, and compounded impacts across people and places. This paper analyses the main demographic trends and challenges in cities across OECD countries, with a...

Over the last 50 years, London has successfully adapted to technological change and globalization, making it the major driver of the UK economy. But its strengths have also made the city particularly vulnerable to the health impacts of COVID-19, and potentially also to wider negative economic...

If firms were animals rather than economic entities, a behavioral scientist trying to describe their traits would observe that firms tend to be found in herds and usually migrate towards the biggest watering holes. This paper surveys the literature on the questions why firms grow stronger with...

We propose an integrated framework to discuss the empirical literature on the local determinants of agglomeration effects. We start by presenting the theoretical mechanisms that ground individual and aggregate empirical specifications. We gradually introduce static effects, dynamic effects, and...

To what extent do New Zealand firms choose to locate close to each other, and why? This paper summarises patterns of geographic concentration of firms in New Zealand between 1987 and 2003. We present a range of summary measures of own-industry concentration, and examine between-industry...

The paper tests the role of agglomeration effects on the export decision of services firms. Recent theories on trade with heterogeneous firms predict that export participation goes along with sunk market-entry costs. Only the more productive firms will be able to overcome these sunk costs. This...