You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "who had the most advanced economy in the world before the eighteenth century?" whose answer is China.
Each document should contain about 30 words, and these documents should contain useful information.

Query: ancient economies ranking top
Useful Output:

Doc 1: 1500: In 1500, China was the largest economy in the world, followed closely by India, both with estimated GDP's of approximately $100 billion.
Doc 2: Best Sellers Rank. #2,686,942 in Books (See Top 100 in Books). #4,368 in Economics (Books). #4,487 in Economic Conditions (Books). #5,049 in Archaeology (Books).
Doc 3: Social scientists who study ancient societies now commonly use the term political economy to emphasize that economic systems fundamentally involve social and
Doc 4: Books in this series will highlight the value of economic history in shedding light on the ways in which economic factors influence growth as well as social
Doc 5: 1. United States. 21,433,226 ; 6. United Kingdom. 2,829,108 ; 7. France. 2,715,518 ; 2. China. 14,342,903 ; 3. Japan. 5,081,770.