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By Paresh Dave

SAN FRANCISCO, April 1 (Reuters) – On stage at an investor conference last month, Google’s Chief Business Officer Philipp Schindler identified a vexing challenge for the company’s most prized app: its virtual assistant.

Responding to user searches out loud through Google Assistant is not ideal for generating revenue, Schindler suggested.

When results are visible, not merely oral, “you have room for advertising, of course,” said Schindler, whose company grosses an estimated $70 billion annually through ads above search results.

The Alphabet Inc company declined to elaborate on Schindler’s remarks. But Google’s conundrum is one facing several big tech companies whose users increasingly seek help from voice-enabled speakers and gadgets: how to

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