The March 10, 2007 edition of The Economist listed the top city economies. Tokyo came out on top, followed very closely by New York. The Economist made the observation that the economic output of NY or Tokyo was the same as all of Canada! I was also interested to find that Chicago (where I live) had just been nudged out of 4th place by London, but that Chicago still had a larger economy than Paris. Even then, Chicago was 1/3 the economic output of NY or Tokyo.
To me this shows what we see in GalCiv2 for economic capitals. Obviously, Japan and the USA have the best developed economic capitals in the world. The article goes on to say that other cities are catching up fast, and that the list of top cities will increasingly include cities from the emerging economies.
Hydro