The London olympics: making a piece of city

Ricky Burdett discusses the Olympics’ ‘Great Leap Eastwards’ and argues that the city is on its way to improving on the pattern of social inequality. However, the journey will be long and fraught with challenges. City government needs to retain control and ownership of the land, and put in place checks and balances to ensure that land values and gentrification do not push existing communities in the vicinity out

Earthworks planning for road construction projects: a case study

In this paper we construct earthwork allocation plans for a linear infrastructure road project. Fuel consumption metrics and an innovative block partitioning and modelling approach are applied to reduce costs. 2D and 3D variants of the problem were compared to see what effect, if any, occurs on solution quality. 3D variants were also considered to see what additional complexities and difficulties occur. The numerical investigation shows a significant improvement and a reduction in fuel consumption as theorised. The proposed solutions differ considerably from plans that were constructed for a distance based metric as commonly used in other approaches. Under certain conditions, 3D problem instances can be solved optimally as 2D problems

Tenure and Experience Effects on Wages: A Theory

This paper investigates equilibria in a labor market where firms post wage/tenure contracts and risk-averse workers, both employed and unemployed, search for better paid job opportunities. Different firms typically offer different contracts. Workers accumulate general human capital through learning-by-doing. With on-the-job search, a worker’s wage evolves endogenously over time through experience effects, tenure effects and quits to better paid employment. This equilibrium approach suggests how to identify econometrically between experience and tenure effects on worker wages.experience, tenure, search, equilibrium

Price distributions and competition

Considerable evidence demonstrates that significant dispersion exists in the prices charged for seemingly homogeneous goods. This paper adopts a simple, flexible equilibrium model of search to investigate the way the market structure influences price dispersion. Using the noisy search approach, the paper demonstrates the effects of having a single large, price-leading firm with multiple outlets and a competitive fringe of small firms with one retail outlet each.

Behaviour of concrete filled stainless steel elliptical hollow sections

This paper presents the behaviour and design of axially loaded concrete filled stainless steel elliptical hollow sections. The experimental investigation was conducted using normal and high strength concrete of 30 and 100 MPa. The current study is based on stub column tests and is therefore limited to cross-section capacity. Based on the existing design guidance in Eurocode 4 for composite columns, the proposed design equations use the continuous strength method to determine the strength of the stainless steel material. It is found to provide the most accurate and consistent prediction of the axial capacity of the composite concrete filled stainless steel elliptical hollow sections due largely to the more precise assessment of the contribution of the stainless steel tube to the composite resistance

Wage/Tenure Contracts with Heterogeneous Firms

This paper investigates equilibria in a labor market where heterogeneous firms post wage/tenure contracts and risk-averse workers, both employed and unemployed, search for new job opportunities. Different firms, even those with the same productivity, typically offer different contracts. Equilibrium finds workers never quit from higher productivity firms to lower productivity firms, but turnover is inefficiently low as employees with large tenures at low productivity firms may reject job offers from more productive firms. A worker who quits to a more productive firm may take a wage cut in anticipation of better wage promotion prospects. Wages within a firm might also increase by a discrete amount at the end of an initial "probationary" spell.

Crime, Inequality, and Unemployment, Second Version

There is much discussion of the relationships between crime, inequality, and unemployment. We construct a model where all three are endogenous. We find that introducing crime into otherwise standard models of labor markets has several interesting implications. For example, it can lead to wage inequality among homogeneous workers. Also, it can generate multiple equilibria in natural but previously unexplored ways; hence two identical neighborhoods can end up with different levels of crime, inequality, and unemployment. We discuss the effects of anti-crime policies like changing jail sentences, as well as more traditional labor market policies like changing unemployment insurance.Crime, Inequality, Unemployment, Search

The interaction of social and perceivable causal factors in shaping ‘over-imitation’

Over-imitation has become a well-documented phenomenon. However there is evidence that both social and visible, physically causal factors can influence the occurrence of over-imitation in children. Here we explore the interplay between these two factors, manipulating both task opacity and social information. Four- to 7-year-old children were given either a causally opaque or transparent box, before which they experienced either (1) a condition where they witnessed a taught, knowledgeable person demonstrate an inefficient method and an untaught model demonstrate a more efficient method; or (2) a baseline condition where they witnessed efficient and inefficient methods performed by two untaught models. Results showed that the level of imitation increased with greater task opacity and when children received social information about knowledgeability consequent on teaching, but only for 6- to 7-year-olds. The findings show that children are selectively attuned to both causal and social factors when learning new cultural knowledge

An On-the-Job Search Model of Crime, Inequality, and Unemployment

We extend simple search-theoretic models of crime, unemployment and inequality to incorporate on-the-job search. This is valuable because, although the simple models can be used to illustrate some important points concerning the economics of crime, on-the-job search models are more relevant empirically as well as more interesting in terms of the types of equilibria they generate. We characterize crime decisions, unemployment, and the equilibrium wage distribution. We use quantitative methods to illustrate key results, including a multiplicity of equilibria with different unemployment and crime rates, and to discuss the effects of changes in labor market and anti-crime policies.Crime, Inequality, Unemployment, Search, Turnov

Infrastructures of equality versus inequality

While planning infrastructure at a large scale it can be easy to lost sight of its effects upon the individuals who actually use it, as well as its capacity to act as a multiplier of social equity. Joining up the dots between the data, density and development, Ricky Burdett explains how policy choices have emboldened infrastructure's social impact in Bogotá and London- and could do so elsewhere