Market Entry and Competition Under Network Effects

62 Pages Posted: 10 Oct 2017 Last revised: 22 Aug 2023

See all articles by Yinbo Feng

Yinbo Feng

University of Toronto - Operations Management

Ming Hu

University of Toronto - Rotman School of Management

Date Written: August 21, 2023

Abstract

We consider a three-stage game in which, first, a large number of potential firms make entry decisions, then those who choose to stay in the market decide on the investment (quality) level in each product, and lastly, customers with heterogeneous preferences arrive sequentially to make (random) purchase decisions based on product quality and historical sales under the network effect according to a discrete choice model. We characterize such a random purchase process and show that a growing network effect always contributes to more sales concentration ex post on a small number of products. Perhaps surprisingly, we further show several phase-changing phenomena regarding equilibrium outcomes with respect to the network effect's strength. In particular, the equilibrium product variety (resp., quality investment) first decreases (resp., increases) and then increases (resp., decreases) as the network effect grows. Specifically, when the strength of the network effect is below a threshold, an increasing network effect would shift more sales towards those products with higher quality, preventing more products from entering the market ex ante and inducing firms to adopt the high-budget equilibrium strategy by making a small number of high-quality products, which is consistent with the blockbuster phenomenon. When the strength of the network effect is above the threshold, the network effect would easily cause the market to be concentrated on a few products ex post; even some low-quality products may have a chance to become a "hit." Interestingly, in this case, when the network effect is growing, the ex-ante equilibrium product variety will be broader, and firms adopt the low-budget equilibrium strategy by making a (relatively) large number of low-quality products, a finding consistent with the long tail theory. We then establish the robustness of the above main insights by accounting for endogenized pricing and multi-products carried by each firm.

Keywords: long tail, blockbuster, product variety, network effect, competitive strategy

JEL Classification: C72, D43, L11, L25, M21

Suggested Citation

Feng, Yinbo and Hu, Ming, Market Entry and Competition Under Network Effects (August 21, 2023). NET Institute Working Paper No. 17-13, Rotman School of Management Working Paper No. 3049370, Available at SSRN: https://ssrn.com/abstract=3049370 or http://dx.doi.org/10.2139/ssrn.3049370

Yinbo Feng (Contact Author)

University of Toronto - Operations Management ( email )

105 St. George st
Toronto, ON M5S 3E6
Canada

Ming Hu

University of Toronto - Rotman School of Management ( email )

105 St. George st
Toronto, ON M5S 3E6
Canada
416-946-5207 (Phone)

HOME PAGE: http://ming.hu

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