https://www.recode.net/2018/1/30/16949932/amazon-health-care-industry-jpmorgan-chase-berkshire-hathaway-numbers

Amazon is no stranger to disrupting industries. But with its tentative entrance into health care, along with Berkshire Hathaway and JPMorgan Chase, it might have challenged its biggest industry yet.

When Amazon announced today that it might be starting its own health care company, health care stocks, predictably, fell. Health services and health technology sectors declined more than any others in the Dow Jones Industrial Average today.