FYI: Even before the hip teenagers realized that nobody goes to the mall anymore, about a dozen math and science Ph.Ds packed into a co-working office in downtown Manhattan already knew it. On their computers, the Ph.Ds started to see a decline in the number of “pings” from cellphones that they were tracking in those malls. And that drop-off became an important signal for the stock market well before some malls announced disappointing financial results.
Regards,
Ted
https://www.barrons.com/articles/how-big-investors-use-your-personal-data-to-play-the-stock-market-1543627499
