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Identifying Sorting - In Theory

  • Jan Eeckhout

    ()

    (Department of Economics, University of Pennsylvania)

  • Philipp Kircher

    ()

    (Department of Economics, University of Pennsylvania)

We argue that using wage data alone, it is virtually impossible to identify whether Assortative Matching between worker and firm types is positive or negative. In standard competitive matching models the wages are determined by the marginal contribution of a worker, and the marginal contribution might be higher or lower for low productivity firms depending on the production function. For every production function that induces positive sorting we can find a production function that induces negative sorting but generates identical wages. This arises even when we allow for non-competitive mismatch, for example due to search frictions. Even though we cannot identify the sign of the sorting, we can identify the strength, i.e., the magnitude of the cross-partial, and the associated welfare loss. While we show analytically that standard fixed effects regressions are not suitable to recover the strength of sorting, we propose an alternative procedure that measures the strength of sorting in the presence of search frictions independent of the sign of the sorting.

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File URL: http://economics.sas.upenn.edu/system/files/working-papers/09-007.pdf
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Paper provided by Penn Institute for Economic Research, Department of Economics, University of Pennsylvania in its series PIER Working Paper Archive with number 09-007.

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Length: 30 pages
Date of creation: 02 Jan 2009
Date of revision:
Handle: RePEc:pen:papers:09-007
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  2. Pieter A. Gautier & Coen N. Teulings, 2003. "How Large are Search Frictions?," Tinbergen Institute Discussion Papers 03-026/3, Tinbergen Institute, revised 22 Aug 2005.
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  9. Mendes, Rute & van den Berg, Gerard J. & Lindeboom, Maarten, 2007. "An Empirical Assessment of Assortative Matching in the Labor Market," IZA Discussion Papers 3053, Institute for the Study of Labor (IZA).
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  16. Combes, Pierre-Philippe & Duranton, Gilles & Gobillon, Laurent, 2008. "Spatial wage disparities: Sorting matters!," Journal of Urban Economics, Elsevier, vol. 63(2), pages 723-742, March.
  17. Shimer, R. & Smith, L., 1998. "Assortive Matching and Search," Papers 98-09, Michigan - Center for Research on Economic & Social Theory.
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