Laboratory experiments with an expectational Phillips curve / Jasmina Arifovic and Thomas J. Sargent ; Commentary / James Bullard, Christopher A. Sims -- Whither central banking? / Charles Goodhart ; Commentary / Donald L. Kohn, Mark Gertler -- Monetary policy in unknown territory: the European Central Bank in early years / Jürgen von Hagen and Matthias Brückner ; Commentary / Stephen G. Cecchetti, Vitor Gaspar -- International currencies and dollarization / Alberto Trejos ; Commentary / Klaus Schmidt-Hebbel, Ross Levine -- Banking panics and the origin of central banking / Gary Gorton and Lixin Huang ; Commentary / John H. Boyd, Edward J. Green -- Establishing a monetary union in the United States / Arthur J. Rolnick, Bruce D. Smith, and Warren E. Weber ; Commentary / Neil Wallace, Bruce Champ -- Currency competition in the digital age / Randall S. Kroszner ; Commentary / Jeremy C. Stein, Jeffrey M. Lacker.