"Enterprise zones", which typically use tax incentives and hiring subsidies to encourage businesses into areas of concentrated poverty and joblessness, do little good. California's 42 enterprise zones have failed to raise employment in targeted areas, according to analysis by Mr Kolka and David Neumark, of the University of California at Irvine. [Subscription required, you can request an electronic copy of the article by sending an email to communications@uci.edu.]

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