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Title: Central Bank Digital Currency: When Price and Bank Stability Collide

Author(s): Jesús Fernández-Villaverde, Linda Marlene Schilling and Harald Uhlig

Publication Date: December 2020

Keyword(s): bank runs, CBDC trilemma, Central bank digital currency, Financial Intermediation, Inflation targeting and monetary policy

Programme Area(s): Monetary Economics and Fluctuations

Abstract: A central bank digital currency, or CBDC, may provide an attractive alternative to traditional demand deposits held in private banks. When offering CBDC accounts, the central bank needs to confront classic issues of banking: conducting maturity transformation while providing liquidity to private customers who suffer "spending'' shocks. We analyze these issues in a nominal version of a Diamond and Dybvig (1983) model, with an additional and exogenous price stability objective for the central bank. While the central bank can always deliver on its nominal obligations, runs can nonetheless occur, manifesting themselves either as excessive real asset liquidation or as a failure to maintain price stability. We demonstrate an impossibility result that we call the CBDC trilemma: of the three goals of efficiency, financial stability (i.e., absence of runs), and price stability, the central bank can achieve at most two.

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Bibliographic Reference

Fernández-Villaverde, J, Schilling, L and Uhlig, H. 2020. 'Central Bank Digital Currency: When Price and Bank Stability Collide'. London, Centre for Economic Policy Research. https://cepr.org/active/publications/discussion_papers/dp.php?dpno=15555