Korea may have an opportunity to exercise historic leadership, when it chairs the G-20 meeting in Seoul, November 11-12.    This will be the first time that a non-G-7 country has hosted the G-20 since the larger, more inclusive, group supplanted the smaller rich-country group in April of last year as the premier steering committee for the world economy.  With large emerging market and developing countries playing such expanded economic roles, the G-7 had lost legitimacy.  It was high time to make the membership more representative.    But there is also a danger that the G-20 will now prove too unwieldy, in which case decision-making might then revert to the smaller group. read more