Juan Ramón Rallo has thoughtfully replied (in English) to my earlier Alt‑M post that discussed two versions of the real-bills doctrine and what I took to be his defense of a prudent-banking version of the doctrine. Here I offer a few comments on his reply.
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One topic under discussion is the common banking practice of borrowing short and lending long (aka maturity transformation). The practice is remunerative to the bank when short-term interest rates are lower than long rates, but it exposes the bank to risks that I previously discussed.
In his latest piece Rallo suggests a categorical condemnation of the practice: “The banks that transform the maturities of their assets and liabilities are causing a discoordination between savers and investors. They are promising savers to redeem their liabilities much sooner than the moment when their assets will be paid by investors, i.e., they are promising savers the availability of some future goods before they are provided by the investors’ projects they are financing.” In my view, by contrast, whether there is a “discoordination” does not depend so much on the promises or contract terms, or what we may call the de jure maturities, as on the de facto maturities.
As Rallo recognizes, holders of short-term liabilities have the option to roll them over. This is especially obvious for demand deposits that remain in the bank for longer than one instant. A one-year certificate of deposit that is renewed at an unchanged interest rate can be considered de facto a two-year (or longer, if renewed again) deposit. This means that a profit-seeking bank faces the challenge of estimating the distribution of actual times-to-withdrawal-or-repricing of its liabilities, which are longer than the de jure maturities.