The capital city of grocery shopping is often humorously referred to as "grocery store." However, if you are looking for a more symbolic or conceptual answer, cities known for large markets or vibrant food scenes, like Tokyo, Paris, or New York City, could fit that description. These cities boast a wide array of grocery stores, markets, and culinary experiences that attract shoppers and food enthusiasts alike. The term "capital city" in this context can vary based on personal perspectives on grocery shopping experiences, local delicacies, and cultural influences on culinary traditions.