Integrating Firm Dynamics into the Shift-Share Framework

This article integrates firm birth and death data into a shift-share analysis framework. The proposed methodology can be used when data availability does not allow for the direct association of employment changes to business demographics at the regional level. It may be also used as an exploratory step before any explanatory econometric work is undertaken as a means of identifying classes of potential control variables. Applying the method to Greek data suggests that firm-size heterogeneity should not be ignored, that local conditions matter more than regional economic structure, and that the latter are asymmetrical across sectors when it comes to the effects of business demographics on regional employment or output growth. Copyright 2007 Blackwell Publishing.

Differences in Labor versus Value Chain Industry Clusters: An Empirical Investigation

Regional analysts often identify industry clusters according to a single dimension of industrial interdependence, typically by trading patterns as revealed in national or regionalized input-output data. This is despite the fact that the theory underpinning regional industry cluster applications draws heavily on Marshall's theory of external economies, including the important role of labor pooling economies and knowledge spillovers in addition to spatially co-located suppliers. This article investigates whether industry clusters identified based on trading relationships (value chain clusters) are meaningfully different in industrial composition and geography than those derived from an analysis of occupational employment requirements (labor-based clusters). The results suggest that value chain linkages are a weak proxy for shared labor requirements, and vice versa. Copyright 2007 Blackwell Publishing.

Productivity, International Trade and Reference Area Interactions in Shift-Share Analysis: Some Operational Notes

These notes discuss and illustrate two new extensions of shift-share analysis: the productivity and output model and the international trade model. We also review a general limitation of these and other shift-share-type models with respect to the interaction between reference area and the region. A possible solution to this limitation is presented. The new extensions provide better insights about the regional economy but that benefit occurs at a cost. The cost is careful consideration and compensation where relatively large regions or sectors are central to the shift-share assessment. The extensions are important in addressing earlier problems with the shift-share approach. Our solution to shift-share limitation on reference area interaction is vital if the method is to be extended to these multiple environments. Copyright 2005 Blackwell Publishing Ltd..