The conversation between human and AI assistant.
[|Human|] Name two of the world's largest companies ranked by revenue.
[|AI|] As of 2021, two of the world's largest companies ranked by revenue are Walmart and State Grid Corporation of China. Walmart is a multinational retail corporation based in the United States, and State Grid Corporation of China is a state-owned utility company based in China.
[|Human|] 
Name two of the world's largest companies ranked by revenue.