The authors are grateful to constructive comments by the referees and the associate editor, who contributed to improve the quality of this manuscript. They thank seminar participants at Bank of Canada and the Office of the Comptroller of the Currency, and participants of the Second Toronto Fintech Conference, Tokenomics 2019, the 2021 Eastern Conference on Mathematical Finance, the 2021 SIAM Annual Meeting, and the 2022 INFORMS Annual Meeting.