Targeting industry clusters for economic development has become popular despite the lack of empirical evidence about the spatial scales over which various clusters agglomerate. This paper identifies twenty manufacturing industry clusters from a principal components analysis of interindustry patterns of trade and measures the spatial employment concentration of each cluster's plants within a polycentric framework. Two to eight centers of employment concentration are detected within the Southern California region for each set of trade linkages. Our spatial half-life measure reveals that half of a cluster's employment in associated establishments is located within a typical range of eight to twelve kilometers (about 5-7.5 miles) to the nearest employment center or subcenter for the particular cluster. Furthermore, employment in seventeen of the twenty clusters is found to be more spatially concentrated than manufacturing employment as a whole, suggesting that geographic proximity is important to interindustry linkages in the Southern California economy. More important, the spatial concentration across industry clusters varies considerably within the metropolitan area, implying that economic development practitioners should consider local context and adapt industry cluster theories to the specific advantages and disadvantages of their immediate locality. Copyright 2008 Blackwell Publishing.

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This paper estimates the valuation effects from new construction of low-income housing tax credit (LIHTC) projects on neighbouring single-family homes in Polk County, Iowa. The evaluative models estimate the impact from LIHTC project locations on assessed values using a 1999—2007 panel of neighbours and their matches, while controlling for unobserved heterogeneity. The results suggest that the siting of new low-rise, concentrated low-income LIHTC projects is associated with a 2—4 per cent slower rate of nearby single-family home valuation and that these effects persisted for five or more years after project approval. On the other hand, no clear valuation effect is detected when the LIHTC project is high quality and targeted to mixed-income groups. It is also found that new construction LIHTC projects serving the elderly, including assisted living, are associated with a 2—4 per cent faster rate of growth in neighbouring single-family home values, although the acceleration appears to be short lived. It is concluded that concentrating low-income renters in subsidised housing projects has negative consequences for neighbouring property values that might be avoided with tenant income mixing and improved site planning and design.