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Icons for the Facebook Inc. app, the Amazon.com Inc. app, the Netflix Inc. app and the Google, a unit of Alphabet Inc., app sit on a Apple Inc. iPhone smartphone in this arranged photograph in London, U.K., on Monday, Aug. 20, 2018. The NYSE FANG+ Index is an equal-dollar weighted index designed to represent a segment of the technology and consumer discretionary sectors consisting of highly-traded growth stocks of technology and tech-enabled companies. Photographer: Jason Alden/Bloomberg via Getty Images

Icons for the Facebook Inc. app, the Amazon.com Inc. app, the Netflix Inc. app and the Google, a unit of Alphabet Inc., app sit on a Apple Inc. iPhone smartphone in this arranged photograph in London, U.K., on Monday, Aug. 20, 2018. The NYSE FANG+ Index is an equal-dollar weighted index designed to represent a segment of the technology and consumer discretionary sectors consisting of highly-traded growth stocks of technology and tech-enabled companies. Photographer: Jason Alden/Bloomberg via Getty Images