Pennsylvania is competing with Ohio and West Virginia for the location of a Shell petrochemical plant that would, according to one report, bring 10,000 construction jobs, hundreds of full-time plant jobs and thousands of additional spin-off jobs to the winning state.

"The chemical industry association ACC (American Chemistry Council) has done studies that estimate a 'multiplier effect' of 5.5 for induced and indirect jobs," wrote Kayla Macke, media relations coordinator for Shell.

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