Working paper

Horizontal cooperation on investment: Evidence from mobile network sharing

Anca Cojoc, Marc Ivaldi, Frank P. Maier-Rigaud, and Oliver März


We present a structural model to investigate the effects of horizontal cooperation on investment in the context of telecommunication networks. More specifically, we estimate the effect of network sharing in the mobile telecommunications industry on prices, network quality and consumer welfare. The presented framework allows estimating the effects of different types of sharing agreements including common ownership of shared assets in a joint venture company or collaboration via geographical separation (geo-split principle). The proposed identification strategy relies on differences in the costs of network deployment of shared versus non-shared network infrastructure, with different costs affecting operators’ optimal choice of price and network quality. We apply the structural model to estimate the effects of a network sharing agreement in the Czech Republic, using a combination of unique datasets on prices, network quality measured as average download speed and operator’s costs of network deployment. The results of our model indicate that horizontal cooperation on investments may be beneficial for consumers. Specifically, the network sharing agreement under study generated cost savings for the sharing parties, which were passed-on to consumers in the form of lower prices and higher average download speed. Our findings are of relevance to the assessment of network sharing agreements, which, considering the substantial investment cost associated with the 5G technology, are likely to play an even greater role in the telecommunications industry in the future. The findings are also of relevance to the general literature on horizontal cooperation on investments.


mobile telecommunication networks; network sharing; cooperation on investment; 4G; 5G; horizontal cooperation; empirical industrial organization;

JEL codes

  • L11: Production, Pricing, and Market Structure • Size Distribution of Firms
  • L40: General
  • L96: Telecommunications


Anca Cojoc, Marc Ivaldi, Frank P. Maier-Rigaud, and Oliver März, Horizontal cooperation on investment: Evidence from mobile network sharing, TSE Working Paper, n. 20-1100, May 2020.

See also

Published in

TSE Working Paper, n. 20-1100, May 2020