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We study the political effects of the diffusion of mobile Internet between 2007 and 2017, using data on electoral outcomes and on mobile Internet signal across the 84,564 municipalities of 22 European countries. We find that access to mobile Internet increased voters' support for right-wing populist parties and for parties running on extreme socially conservative platforms, primarily in areas with greater economic deprivation. Using survey data, we also show that mobile Internet increased communitarian attitudes, such as nationalism and dislike of strangers and minorities. We conclude that mobile Internet benefitted right-wing populist parties because, in line with findings in social psychology, it fostered offline tribalism.

We study the political effects of the diffusion of mobile Internet between 2007 and 2017 using administrative data on electoral outcomes and on mobile Internet signal across the 82,094 municipalities of twenty European countries, which we complement with individual survey data on voters’ values and positions. In line with literature in social psychology claiming that social media promote tribalism and make individuals particularly permeable to messages of intolerance that prime the insiders at the expense of the outsiders, we show that this technology led to an increase in voters’ support for communitarian parties campaigning on nationalism and dislike of strangers and minorities. Our estimates suggest that between one third and one half of the remarkable success of communitarian parties, which roughly doubled their support over the period, can be ascribed to enhanced access to mobile Internet technology.

We reconsider the relationship between oil and conflict, focusing on the location of oil resources. In a panel of 132 countries over the period 1962-2009, we show that oil windfalls escalate conflict in onshore-rich countries, while they de-escalate conflict in offshore-rich countries. We use a model to illustrate how these opposite effects can be explained by a fighting capacity mechanism, whereby the government can use offshore oil income to increase its fighting capacity, while onshore oil may be looted by oppositional groups to finance a rebellion. We provide empirical evidence supporting this interpretation: we find that oil price windfalls increase both the number and strength of active rebel groups in onshore-rich countries, while they strengthen the government in offshore-rich ones.

We study the effect of information on technology adoption and productivity in agriculture. Our empirical strategy exploits the expansion of the mobile phone network in previously uncovered areas of rural India coupled with the availability of call centers for agricultural advice. We measure information on agricultural practices by analyzing the content of 2.5 million phone calls made by farmers to one of India's leading call centers for agricultural advice. We find that areas receiving coverage from new towers and with no language barriers between farmers and advisers answering their calls experience higher adoption of high yielding varieties of seeds and other complementary inputs, as well as higher increase in agricultural productivity. Our estimates indicate that information frictions can explain around 25 percent of the agricultural productivity gap between the most productive and the least productive areas in our sample.

Farmers in developing countries often lack access to timely and reliable information about modern technologies that are essential to improve agricultural productivity. The recent diffusion of mobile phones has the potential to overcome these barriers by making information available to those previously unconnected. In this paper we study the effect of mobile phone network expansion in rural India on adoption of high yielding variety seeds and chemical fertilizers. Our empirical strategy exploits geographical variation in the construction of mobile phone towers under a large government program targeting areas without existing coverage. To explore the role of mobile phones in mitigating information frictions we analyze the content of 1.4 million phone calls made by farmers to a major call center for agricultural advice. Farmers seek advice on which seed varieties and fertilizers better meet their needs and how to use them. We find that areas receiving mobile phone coverage experience higher adoption of these technologies. We also observe that farmers are often unaware of the eligibility criteria and loan terms offered by subsidized credit programs. Consistently, we find that areas receiving mobile phone coverage experience higher take-up of agricultural credit.