SARAH GREEN: That was head of the IMF, Christine Lagarde, and HBR editor in chief, Adi Ignatius. For more, including some different excerpts from the interview, visit hbr.org.

Reprint: R1311J At 57, Christine Lagarde has held top jobs in government, in the private sector, and now at a big global institution, the International Monetary Fund, where she became managing ...