The headline isn't consistent with the article itself, which states (somewhat confusingly): * As the number of product data grows, the benefits were negligible

The headline isn't consistent with the article itself, which states (somewhat confusingly): * As the number of product data grows, the benefits were negligible * More observations per product was important * The results were consistent with asymptotic theory (central limit theorem) that predicts that more data has diminishing returns. In any case, this seems to be a case of "diminishing returns."