Banks at the threshold
The most sensitive point in the ECB’s digital euro stress assessment is the group of 9 banks at risk of a liquidity coverage ratio below 100 percent. They represent 0.1 percent of banking assets. Under the same assumptions, another 13 banks, representing 0.3 percent of assets, reach the 100 percent threshold. The aggregate system retains strength while room to manoeuvre narrows on individual balance sheets. I start with this distribution: the resources sustaining a bank during deposit flight cannot be borrowed from an average of other banks’ buffers. The relevant question is where the outflow concentrates and how that institution obtains cash.[1]
That result comes from a hypothetical individual holding limit of 3000 euros. The study examines 500–3000 euros; a final limit has yet to be selected. Digital euro holdings would earn no interest. Incoming payments above the limit would move into a linked bank account, which could also supply funds for payments exceeding the digital euro balance. The economic function of these arrangements is to reduce the need to hold a large digital euro balance simply to make payments. They place a boundary between payment access and sustained withdrawal of bank deposits. Its effectiveness still depends on the behaviour of people simultaneously seeking safety.[1]
The chain from reserves to collateral
The possible chain begins with deposits converted into digital euros and reaches a bank’s available reserves. The next step described by the ECB is interbank funding. A bank without excess reserves can turn to that market; an institution without market access can borrow from the central bank against unencumbered collateral. My inference is that funding access and usable collateral determine resilience alongside the holding limit. An outflow absorbed by reserves at one bank can create a new funding obligation at another. Alternatively, smooth interbank funding could allow deposit outflows to be managed within the wider banking system, containing pressure on a weaker institution.[1]
Strong buffers work against that chain. Changes in cash use could generate 127 billion euros of bank deposit inflows over the study’s ordinary-scenario horizon ending in 2034, equivalent to 0.4 percent of assets and 1.5 percent of sight deposits. The assessment shows those inflows covering ordinary outflows at limits up to 3000 euros. Even excluding cash inflows entirely, the aggregate liquidity coverage ratio falls from 166 percent to 163 percent and the net stable funding ratio from 128 percent to 127 percent. Adoption of digital euros and conversion of cash into bank deposits can create opposing flows on the same balance sheet. That balance constrains a narrative of exclusively outward deposit movement.[1]
Where the buffer sits
The extreme assessment assumes a flight to safety beyond anything experienced during the euro’s first 25 years. It also uses a world without a monetary-policy response. Aggregate ratios remaining above 100 percent under those harsh conditions demonstrate the strength of system buffers. The no-response assumption excludes some tools that could be used during an actual crisis. I read the exercise to locate the point at which the design comes under pressure. In a subsequent assessment, the treatment of individual banks’ funding access and unencumbered collateral could explain more than the aggregate average. This is a sensitivity exposed by assumptions rather than an observed episode of deposit flight.[1]
The final choice combines a funding boundary with a payment feature. Large buffers at many banks do not remove reserve and collateral needs at a small group. Three elements belong together: the final holding limit, possible deposits from cash, and funding available under stress. Conditional on legislation, the ECB targets readiness in 2029 and a 12-month pilot from the second half of 2027. The economic value of preparation lies in improving payment access while clarifying how the bank with the narrowest liquidity margin would meet outflows. My conclusion is that digital euro resilience depends on the weakest funding connection alongside the size of aggregate buffers.[1]