Preface
In March 2020, Target’s machine learning models, built by world-class data science teams, told the company to keep stocking jeans and party dresses. Customers were busy clearing the shelves of toilet paper, sweatpants, and cleaning supplies. Apparel comp sales fell more than 30 percent in the worst weeks of March; electronics and household essentials surged 20 to 45 percent in the other direction. At Amazon, the algorithms that had balanced millions of SKUs were overwhelmed: household essentials vanished from the site, and the company suspended inbound shipments of anything it classified as non-essential just to free up warehouse capacity. At Walmart, stockouts climbed across 4,700 U.S. stores faster than the planning systems could adjust, ...
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