This paper matches archival data from the Uniform Code Council to establishments in the Longitudinal Business Database and Economic Census to study the diffusion and impacts of the Universal Product Code (UPC). We find evidence of network effects in the diffusion process. Matched-sample difference-in-difference estimates show that employment and trademark registrations increase following UPC adoption by manufacturers or wholesalers. Industry-level imports also increase with domestic UPC adoption. Our findings suggest that barcodes, scanning and related technologies helped stimulate variety-enhancing product innovation and encourage the growth of international retail supply chains.
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