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Bill Lehr, Frank Lichtenberg, Information Technology and Its Impact on Productivity: Firm-Level Evidence from Government and Private Data Sources, 1977-1993, The Canadian Journal of Economics / Revue canadienne d'Economique, Vol. 32, No. 2, Special Issue on Service Sector Productivity and the Productivity Paradox (Apr., 1999), pp. 335-362
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Lehr et al. (1999) studied this question.
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