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In the ongoing legal battle over Google's default search engine status, U.S. District Judge Amit Mehta questioned the U.S. Department of Justice's assertions that altering the playing field would result in rivals gaining more users.

The pivotal testimony came from MIT economics professor Michael Whinston, a key witness, who claimed that providing users with a choice in selecting their search engine or changing the default search engine on a device would significantly reshape Google's current market dominance.

Doubt Cast on Testimony

Despite Whinston's insistence that competitors like DuckDuckGo and Microsoft's Bing are hampered by their lack of scale in comparison to Google, Judge Mehta raised doubts about the potential influence of quality on user preferences. The judge remarked, "It's not clear to me why the share wouldn't remain static."

Whinston countered by suggesting that if rivals managed to improve their scale, there might be a shift in user preference, citing factors like word of mouth and media reviews of search engines.

Whinston's testimony holds significant weight in the DOJ and state attorneys general cases against Google, which allege anticompetitive practices in online search and advertising. The focus centers on Google's monopoly secured through revenue-sharing agreements that designate it as the default search engine on various platforms.

Evidence and Testimony

Whinston's testimony relied heavily on internal company documents, often heavily redacted, which revealed Google's financial arrangements and market share analysis. Notably, a Google estimate was disclosed, indicating that it would cost Apple $200 billion to establish a rival search engine.

The Importance of Defaults

Whinston emphasized that default settings are vital, not just because users find it challenging to change their preferences but because they impact market dynamics. He cited instances where Google's market share decreased when competitors were introduced and argued that defaults significantly influenced user behavior.

The Influence of Scale

Whinston's analysis of scale and its impact on competition was a focal point. While Google contended that scale's significance is diminishing, Whinston argued that scale is vital in various ways, including attracting advertisers and offering users a one-stop-shop feature.

Continuing Cross-Examination

Whinston will return to conclude his cross-examination, exploring issues such as market definitions and competition. The ongoing trial promises to shed light on the complex dynamics of online search and the role of default settings.

Legal Representatives

The U.S. government is represented by a team of attorneys from the Department of Justice's Antitrust Division. Google's legal counsel includes representatives from Williams & Connolly LLP, Wilson Sonsini Goodrich & Rosati PC, and Ropes & Gray LLP.