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It is sometimes claimed that the degree of polycentricity of an urban region influences that region’s competitiveness. However, because of widespread use and policy relevance, the underlying concept of polycentricity has become a ‘stretched concept’ in urban studies. As a result, academic debate on the topic leads to situations reminiscent of Babel’s Tower. This meta-study of the scientific literature in urban studies traces the conceptual stretching of polycentricity using scientometric methods and content analysis. All published studies that either apply the concept directly or cite a work that does, were collected from the Scopus bibliographic database. This resulted in a citation network with over 9000 works and more than 20,000 citations between them. Network analysis and clustering algorithms were used to define the most influential papers in different citation clusters within the network. Subsequently, we employed content analysis to systematically assess the mechanisms associated with the formation of polycentric urban systems in each of these papers. Based on this meta-analysis, we argue that the common categorisation of polycentricity research in intra-urban, inter-urban and inter-regional polycentricity is somewhat misleading. More apt categorisations to understand the origins of polycentricity’s conceptual ambiguity relate to different methodological traditions and geographical contexts in which the research is conducted. Nonetheless, we observe a firm relation across clusters between assessments of polycentricity and different kinds of agglomeration economies. We conclude by proposing a re-conceptualisation of polycentricity based on explicitly acknowledging the variable spatial impact of these different kinds of agglomeration economies. [ABSTRACT FROM AUTHOR]

As recovery from the Great Recession continues, economic development scholars and practitioners are again focused on the pace and the sustainability of recovery, as well as on efforts to minimise the severity of future downturns. This paper contributes to the literature by exploring the relationship between industry diversity and economic resilience over time. Using fixed effects models with data from the Bureau of Labour Statistics and the Census Bureau, the paper examines the influence of industrial diversity and concentration on unemployment rate stability in Ohio counties between 1977 and 2011. Results indicate that while more concentrated counties had lower unemployment rates when times were good, counties with more diverse industry structures fared better during times of national or local employment shocks. The paper also finds that there is a relationship between concentration in particular industries and the ability to withstand a shock changes over the 35 years examined, thus highlighting the need to take care when interpreting findings over shorter periods and the need to consider the particular industry of dependence. While local policymakers have little ability to affect industrial concentration in the short run, the paper recommends that highly concentrated counties adopt policies that may help buffer their economies to effects of negative shocks. [ABSTRACT FROM AUTHOR]

This paper examines the effect of spatial structure, as measured on the monocentricity–polycentricity dimension, on labour productivity at the prefectural level in China. Using pooled cross-sectional and instrumental variable techniques, we find that, all else being equal, prefectures with a more monocentric spatial structure have a higher labour productivity, robust to different specifications. Furthermore, large agglomeration economies may fuel the beneficial effects of monocentricity. We conclude that, in terms of economic performance, monocentric-oriented spatial strategy could be a better choice for Chinese prefecture-scale regions. [ABSTRACT FROM AUTHOR]

'Borrowed size' is an emerging policy concept in several European countries, presenting theoretical potential to explain contemporary urban dynamics unaddressed through conventional urban growth theories that emphasise the role of agglomeration economies. In its original conceptualisation by Alonso, the concept describes and explains the situation that especially smaller cities that are located in a larger 'megapolitan complex' do perform better because they have access to agglomeration benefits of larger neighbouring cities. This paper scrutinises the concept of borrowed size, thereby focusing on its conceptualisation and reviewing its empirical justification thus far. Our empirical analyses show that the concept must be stretched in terms of scale and scope to enhance its policy value. Borrowed size occurs when a city possesses urban functions and/or performance levels normally associated with larger cities. This is enabled through interactions in networks of cities across multiple spatial scales. These networks serve as a substitute for the benefits of agglomeration. Theoretically, the borrowed size concept demands a recasting of the geographical foundations of agglomeration theory. [ABSTRACT FROM AUTHOR]

This paper is an empirical analysis of employment centres in the Los Angeles region from 1997 to 2014. Most extant work on employment centres focuses on identification methodology or their dynamics during a period of industrial restructuring from 1980 to 2000. We analyse employment centres using point-based, rather than census tract-based employment data and a non-parametric identification method with a single concept of proximity. We focus on changes across five key industries: knowledge-intensive business services (KIBS), retail, creative, industrial and high-tech, emphasising changes in centre composition as well as their boundaries. Results show far greater change across centres than previous longitudinal studies. Only 43% of the land area that is in an employment centre is part of one in both 1997 and 2014. Using a persistence score, centres range from stable to highly fluctuating, but emerging, persisting and dying centres are found in core and fringe areas alike. KIBS are most associated with stable centres, while high tech employment is attracted toward emerging areas and retail exists throughout. Emerging centres are more likely to have greater accessibility, while industrial employment becomes far more concentrated in centres by 2014. [ABSTRACT FROM AUTHOR]

Access to a large labour pool (labour pooling) leads to local economic concentrations through agglomeration economies. However, these concentrations may be self-limiting by reducing labour availability through competition over high-skill workers. This paper examines whether labour pooling and labour availability of workers with different incomes account for local job growth in the Atlanta metropolitan area between 2000 and 2006. Workers’ income is employed to account for the human capital of workers, including education and skills. It is found that the availability of high-income workers is the only positive significant factor for job growth and the spatial size of the effect is larger than the traffic analysis zone (neighbourhood scale). In contrast, no labour pooling indicators show a positive association with job growth. The finding casts doubt on labour pooling effects at the intraregional level and suggests avenues for further research on local-area agglomeration economies. [ABSTRACT FROM PUBLISHER]

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Prior studies in finance have examined the comovement of stock returns of firms headquartered in the same location. One interpretation of the results is that local investors have a ‘local bias’ due to an information advantage on local firms. We propose that localised agglomeration economies affect the fundamentals of local firms, resulting in the local comovement of stock returns. Using data for China A-share listed firms from 1997 to 2007, we find evidence of the comovement of stock returns of Chinese firms headquartered in the same city. We find inconsistent evidence for the local bias theory. The comovement of the stock returns of firms headquartered in the same city is stronger when the agglomeration economies in the city are stronger, suggesting that localised agglomeration economies provide an alternative explanation of the comovement of stock returns. [ABSTRACT FROM AUTHOR]