Diamond-Dybvig-Bernanke is a flawed model of banking that has no room for a lender of last resort
The Royal Swedish Academy of Sciences has awarded the Sveriges Riksbank Prize in Economic Sciences in Memory of Alfred Nobel 2022 to Ben S. Bernanke, Douglas W. Diamond, and Philip H. Dybvig for having “significantly improved our understanding of the role of banks in the economy, particularly during financial crises” (Royal Swedish Academy of Sciences 2022a).
The main justification for Diamond and Dybvig's (DD) award is given by a paper published in 1983: “In an article from 1983, Diamond and Dybvig develop a theoretical model that explains how banks create liquidity for savers, while borrowers can access long-term financing” (Royal Swedish Academy of Sciences 2022b, p.4).
A short exposition of the model