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Google's introduction of the Chrome web browser in 2008 is a quintessential instance of brand extension-the company leveraged its brand recognition as an internet search provider to enter a product category where it had not previously competed. An outstanding question is whether perceived category similarity predicts consumers' likelihood of purchasing brand extensions. To answer this question, Alicia Grasby et al. identified 30 extended-brand pairs (e.g., the same brand of shoes and gloves) in 52 weeks of purchases by approximately 60,000 households and, for each pair, calculated the change in probability of a brand in one category being purchased if the same brand was purchased in the other category.