Information from Markets Near and Far: Mobile Phones and Agricultural Markets in Niger
利用尼日尔2001-2006年手机服务引入的数据，研究发现手机普及使谷物价格离散度降低10%至16%，对运输成本高的市场影响更大。
Price dispersion across markets is common in developing countries. Using novel market and trader-level data, this paper provides estimates of the impact of mobile phones on price dispersion across grain markets in Niger. The introduction of mobile phone service between 2001 and 2006 explains a 10 to 16 percent reduction in grain price dispersion. The effect is stronger for market pairs with higher transport costs.