Amazon's Dominance Under Threat: Walmart, Instacart
Amazon's Dominance Under Threat: Walmart, Instacart

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Welcome to the Insider Advertising daily for September 22.

I'm Lauren Johnson, a senior advertising reporter at Business Insider.

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Today's news: Walmart and Instacart chip away at Amazon's ad dominance, Quibi mulls a sale, and Suzy raises $34 million.