India, which will hold the G-20 presidency next year, will have a difficult task as the group’s chair to bring countries together on some of the key challenges being faced by the world, Pierre-Olivier Gourinchas, the chief economist of the IMF,India, which will hold the G-20 presidency next year, will have a difficult task as the group’s chair to bring countries together on some of the key challenges being faced by the world, Pierre-Olivier Gourinchas, the chief economist of the IMF,