Sources and acknowledgments

The author would like to give special thanks to the following for their help and insights: Viral Acharya; Tobias Adrian; Andrew Bailey; Helge Berger; Alex Brazier; Markus Brunnermeier; Agustin Carstens; Steve Cecchetti; Bill Dudley; Rickard Eriksson; Kristin Forbes; Alicia Garcia Herrero; Donald Kohn; Christine Lagarde; Nakaso Hiroshi; Christina Parajon Skinner; Eswar Prasad; Glenn Rudebusch; Kenneth Rogoff; Randal Quarles; Raghuram Rajan; Shirakawa Masaaki; Larry Summers; Sir Paul Tucker and Yu Yongding.