We argue that theories and methods drawn from complexity science are urgently needed to
guide the development and use of digital twins for cities. The theoretical framework from …

A power law (PL) is the form taken by a large number of surprising empirical regularities in
economics and finance. This review surveys well-documented empirical PLs regarding …

Why do some cities grow economically while others decline? Why do some show sustained
economic performance while others cycle up and down? In Keys to the City, Michael …

US firms in service industries increasingly operate in more local markets. Employment,
sales, and spending on fixed costs have increased rapidly in these industries. These …

The Human Settlements Group works to reduce poverty and improve health and housing
conditions in the urban centres of Africa, Asia and Latin America. It seeks to combine this …

Settlements in coastal lowlands are especially vulnerable to risks resulting from climate
change, yet these lowlands are densely settled and growing rapidly. In this paper, we …

With over half of the world's population now living in urban areas, the ability to model and
understand the structure and dynamics of cities is becoming increasingly valuable …

This paper proposes that idiosyncratic firm‐level shocks can explain an important part of
aggregate movements and provide a microfoundation for aggregate shocks. Existing …

This paper develops a simple equilibrium model of CEO pay. CEOs have different talents
and are matched to firms in a competitive assignment model. In market equilibrium, a CEO's …

Large cities produce more output per capita than small cities. This higher productivity may
occur because more talented individuals sort into large cities, because large cities select …