Top 25 Cities, version 17

Here are the top 25 metropolitan areas in the world.  I am influenced by the paper "Global Metropolis".  I will raise GDP estimates but not lower them. These are enormous areas.  The "city" of Greater Beijing has 244 million people in it, yet this is still not the biggest city economically.  New York includes the entire states of New Jersey,Connecticut, and Delaware and a good chunk of New York and Pennsylvania.

1. Tokyo-Yokohama [1998] 
2. Beijing-Tianjin/Shandong/Liaoning [1852] 
3. New York/New Jersey/Philadelphia [1650]
4. Shanghai [1502] 
5. Hong Kong-Guangdong [1085] 
6. Los Angeles/Riverside (766) 
7. Paris [695]
8. Osaka-Kobe-Kyoto [618]
9. London [592] 
10. Chicago [574]
11. Nagoya (Chukyo) [558]
12. Washington/Baltimore [466] 
13. Seoul/Incheon [440]
14. Rhine-Ruhr [420] 
15. San Francisco/San Jose [409]  
16. Mexico City [390] 
17. Sao Paulo [388] 
18. Buenos Aires [362] 
19. Brussels/Antwerp/Gent/Lille [336] 
20. Moscow [321] 
21. Houston [316] 
22. Dallas/Ft. Worth [315] 
23. Milan [306] 
24. Boston [275] 
25. Randstad [274]