WASHINGTON — Seeds of further global cooperation on financial services oversight may be sown as the Group of 20 leaders meet here this weekend, but changes are likely to be subtle.

No one is expecting countries to give up any supervisory discretion, but hopes are high that the talks will lay the groundwork for closer collaboration through entities like the Financial Stability Forum, a nine-year-old coalition of national regulatory authorities, central banks, and international supervisory bodies that studies the international financial system's weaknesses and proposes improvements.

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