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Competition and Defaults in Online Search

Francesco DecarolisMuxin LiFilippo Paternollo

出版	Centre for Economic Policy Research, 2023
URL	http://books.google.com.hk/books?id=VkKizwEACAAJ&hl=&source=gbs_api

註釋Promoting and maintaining competition in the online markets dominated by few, large platforms has been an elusive quest for governments and their competition authorities. In this study, we offer the first systematic assessment of the quantitative effects of a series of interventions taken across countries to curb Google's dominance in search by limiting its use as the default option. By exploiting the timing with which such interventions occurred in the European Economic Area, Russia, and Turkey relative to control group countries, we study how changes to the default settings on mobile devices impacted the penetration of different search engines. Our findings show that in all of these three cases, the interventions were effective in reducing the market share of Google. The causal impact of the public intervention amounts to less than 2 percentage points in the European Economic Area, 7 percentage points in Russia, and 12 percentage points in Turkey. These differences are driven by the nuances of the specific interventions such as the size of the targeted group of users, local market characteristics, and remedy designs.