Amazon sellers can no longer comment on product reviews, which could increase the risk of lost sales and reputation damage from negative reviews.

Consumers in Japan are becoming more familiar with the American shopping day, but they're shopping at supermarkets rather than electronics stores.

Clothing and apparel retailers are continuing to see steep declines in 2020, with sales well below 2019 levels.

eMarketer principal analyst Debra Aho Williamson, senior analyst Jasmine Enberg, and junior analyst at Insider Intelligence Blake Droesch discuss what they're paying attention to in 2021, and why: the rise of social entertainment, WhatsApp's next move, and stalling social commerce.