This document summarizes the gradual development and evolution of retail formats in the United States and India from the barter system to modern organized retailing. It traces the key phases in the United States from Montgomery Ward establishing mass retailing in the 1800s to the rise of shopping malls, discount stores, and franchising in the post-WWII era. In India, it notes the dominance of small unorganized family-run stores and rural markets, but also the recent growth of branded stores, department stores, and specialty retailers since economic liberalization in the 1990s as organized retail has begun to develop and replace the unorganized sector.