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When information is limited or costly, agents are unable to engage in optimal arbitrage. Excess price dispersion across markets can arise and goods may not be allocated efficiently; in this setting, information technologies may improve market performance and increase welfare. Between 1997 and 2001, mobile phone service was introduced throughout Kerala, a state in India with a large fishing industry. Using micro-level survey data, we show that the adoption of mobile phones by fishermen and wholesalers was associated with a dramatic reduction in price dispersion, the complete elimination of waste and near-perfect adherence to the Law of One Price. Both consumer and producer welfare increased.
Robert T. Jensen (Mon,) studied this question.
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