A new Consumer Technology Association (CTA) study found that 31% of American households now own smart speakers like the Amazon Echo and Google Home.

If that percentage seems low, consider that only 8% of households owned smart speakers in 2016.

The growth in smart speaker ownership has almost doubled in each of the last two years.

The CTA 21st Annual Consumer Technology Ownership and Market Potential Study surveyed 2,608 adults in the U.S. during the second week in March.

The survey examined ownership and plans to buy nearly 60 tech products.

While many Americans may not think of smart speakers as artificial intelligence, the CTA report casts the rapid sales growth of Amazon Echo and Google Nest Home devices as an endorsement of A.I.

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