Mobile network-sharing agreements: Opportunity or threat?

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Mobile network-sharing agreements (NSAs) can support investment by relieving capital constraints, lowering the unit costs of expanding networks, and generating network cost savings that reduce both the scale of the investment and operating costs. However, concerns have been expressed about the anticompetitive effects of such cooperation between competitors. Given the importance of examining NSAs case by case, how can one assess their potential anticompetitive effects, and analyse and verify their benefits?