GroupM: Google, Facebook, and Amazon "triopoly" grew its share of US digital ad market from 80% in 2019 to 90% in 2020, and now collects 50%+ of all US ad spend (Wall Street Journal)

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Wall Street Journal:
GroupM: Google, Facebook, and Amazon “triopoly” grew its share of US digital ad market from 80% in 2019 to 90% in 2020, and now collects 50%+ of all US ad spend  —  The three tech giants now collect more than half of all ad dollars spent in the U.S. The pandemic economy got them there.

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