Competition in Network Industries : Evidence from the Rwandan Mobile Phone Network

This paper evaluates whether competition hinders or spurs investment in a network industry. When a network is split between competitors, potential network effects are foregone. However, a firm may invest in components that are not shared, to steal customers from its competitors. I structurally estimate the utility of adopting a mobile phone from its subsequent usage, using transaction data from nearly the entire Rwandan network over 4.5 years. I simulate the equilibrium choices of consumers and network operators, and consider Rwanda's decision to delay the introduction of competition. I show that there is a policy under which adding a competitor earlier would have reduced prices and increased incentives to invest in rural towers, increasing welfare by the equivalent of 1% of GDP. I analyze the effects of setting different interconnection rates, and reducing switching costs through number portability