This paper estimates the impact of access to mobile money services on local economic activity. The analysis combines data from the early expansion of the mobile agent network in Kenya with a local-level measure of economic performance proxied by the intensity of nighttime lights. Leveraging the variation in areas that gained access to mobile money services at different times and the high resolution of the data, the paper shows that access to mobile money services increased local economic activity and that these effects increased over time. The positive effects are more pronounced for areas that were initially more affluent, urban, and better connected to infrastructure. These results suggest that mobile money can complement, rather than just substitute for, other alternatives that enable people to connect, trade, and allocate investments within their networks.