Economics and Usage of Digital Libraries: Byting the BulletSkip other details (including permanent urls, DOI, citation information)
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8. In the first eight months of the experiment, users paid with a First Virtual VPIN account, rather than with a credit card. Because a VPIN was an unfamiliar product, the non-pecuniary costs were probably higher than for credit card usage, although formally the user needed to undertake the same steps.
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