Replaying the 2022–23 tightening in full magnitude shows what an embedded energy shock would require — and why markets could break long before the deposit rate got there
A 6.5–7.0% ECB deposit rate is not a forecast. It is the destination reached if the ECB had to repeat the full 450bp tightening of July 2022–September 2023 from either end of today’s policy base (2.00% before the shock, 2.50% now), used as a boundary condition to test how far its reaction function could stretch if a prolonged energy shock became embedded in domestic inflation. Under a Taylor-type rule the range requires sustained underlying inflation of roughly 4.5–5%, about double today’s core, and even the ECB staff’s severe scenario falls well short of that. The decisive issue is not the energy shock but whether it propagates through services, wages, expectations and price-setting. Markets and bank balance sheets would react long before policy rates approached the range, so the ECB could be financially constrained even if the inflation arithmetic called for more.
A 6.5–7.0% ECB deposit rate is what results if the Governing Council had to repeat, in full magnitude, the 450bp tightening of July 2022–September 2023 from either end of today’s policy base: 2.00% before this year’s shock, 2.50% now. We use it as a boundary condition to ask how far the ECB’s reaction function could stretch if a prolonged energy shock became embedded in domestic inflation.
Three findings. First, the range is demanding: under a standard Taylor-type rule it requires sustained underlying inflation of roughly 4.5–5%, about double today’s 2.5% core, and even the ECB staff’s own severe scenario falls well short of that. Second, the energy shock itself is not the issue. Energy inflation of 18.8% contributes about 1.7pp of the 3.8% headline; what matters is whether it propagates through services, wages, expectations and price-setting, none of which has yet broken out. Third, markets and balance sheets would react long before policy rates came near the range: the 10-year Bund, at about 3.4–3.6%, already exceeds its 2023 peak with the deposit rate 150bp lower, and the OAT–Bund spread is at its widest since 2012. The real question is whether a prolonged energy shock could force a reaction function comparable in magnitude to 2022–23, and whether the euro-area financial system could withstand it.
Official data. The ECB raised its deposit rate from −0.50% to 4.00% in ten consecutive hikes, with effect from 27 July 2022 to 20 September 2023: 450bp in 14 months, to the highest deposit rate in its history (the previous high was 3.75% in 2000). It then cut to 2.00% by June 2025, held there for a year, and raised to 2.25% (effective 17 June 2026) and 2.50% (16 September) as the energy shock built.
LBMR interpretation. Adding 450bp to 2.00% gives 6.50%; to 2.50%, 7.00%. That is a measure of magnitude, not a path or a probability, and it is a deliberately generous template. The first 250bp of the 2022–23 cycle only lifted the rate from negative territory back to 2.00%, the level the ECB held before this shock; only the final 200bp were restrictive. Replicating that leg alone implies about 4.5%. The 6.5–7.0% range therefore reproduces the entire cycle and sits 250–300bp above the highest deposit rate ever set.
This content is for informational purposes only and is not investment, legal, or tax advice. See the full Disclaimer.
The inflation requirement is equally demanding. Headline HICP peaked at 10.6% in October 2022 (Eurostat); it is 3.8% today. Using an illustrative Taylor-type rule, i = r* + π + 0.5(π − 2), with a neutral real rate of 0.75% and a closed output gap (LBMR assumptions, not ECB estimates), 6.5–7.0% corresponds to sustained inflation of about 4.5–4.8%. The same rule gives 4.25% at 3.0% core inflation and 5.75% at 4.0%. At today’s 2.5% core it gives 3.5%, about 100bp above the current rate, consistent with a stance that is not restrictive in real terms: the deposit rate is roughly zero against core and about 1.3 points below headline. Even ECB staff’s severe scenario, which combines a larger and more persistent energy shock with stronger wage and non-energy price reactions, projects 2027 core inflation of 3.5% (headline 5.4%); the same rule maps 3.5% to about 5.0%, still 150–200bp below the stress range.
Table 1 — The stress-test ladder
| Benchmark | Deposit rate | Derivation and evidence class |
|---|---|---|
| Current policy rate | 2.50% | OFFICIAL — ECB, effective 16 Sep 2026 |
| Market reference | 10Y Bund about 3.4–3.6% | MARKET — 1–2 Oct 2026 |
| 2023 cycle peak (highest ever) | 4.00% | OFFICIAL — ECB, 20 Sep 2023 |
| Restrictive leg replicated from today | about 4.50% | LBMR — +200bp (2.00% to 4.00% in 2022–23) |
| Full 450bp from pre-shock base | 6.50% | LBMR — 2.00% + 450bp |
| Full 450bp from current rate | 7.00% | LBMR — 2.50% + 450bp |
| Rule-implied rate at today’s 2.5% core | about 3.5% | LBMR illustrative Taylor-type rule |
Official data. September flash HICP was 3.8% (3.2% in August), with energy at 18.8%, core at 2.5% and services at 3.2%. With energy at roughly a 9% weight, it contributes about 1.7pp of the headline (LBMR calculation), implying ex-energy inflation near 2.3%. National rates range from 3.4% in France (INSEE, provisional) to 4.1% in Italy (ISTAT, provisional) and 5.0% in Spain (INE, flash). Brent closed at $105–107 on 24 and 28 September and was around $101 on 5 October (CNBC; Trading Economics), against under $73 before the war (AP).
LBMR interpretation. A price-level shock is not an inflation regime. If energy prices stabilise at a high level, energy inflation fades mechanically within about a year as base effects roll off, leaving a one-off level shift. A persistent regime needs agents to respond, and there are four channels where that would show first:
The starting point is better than in 2022: inflation was 2.2% in September 2025 and wage growth is decelerating. The risk lies elsewhere. This is the second major energy shock in four years, and repeated shocks erode the presumption that spikes are temporary. That lowers the threshold at which wage-setters index and firms reprice, so embedding becomes more likely for a given shock size.
Official data and market pricing. On 28 September President Lagarde restated that the ECB responds to the risk of embedding, assessed through the inflation outlook, underlying inflation dynamics and policy transmission. She saw higher inflation ahead but no embedding yet, called for a measured response, and noted that long-term yields have risen sharply, which will slow growth and dampen pass-through by more than staff assumed. Staff project growth of 0.9% in 2026. Markets price about a 20% chance of an October hike (Danske Bank), down from around 50% earlier in the month (MUFG).
LBMR interpretation. The reaction function is convex in the evidence of embedding. With services, wages and expectations contained, the response is a hold or a small insurance move. Once they move together, the Council must restore a restrictive real rate, and the rule arithmetic above shows how quickly the required destination rises. 2022–23 cuts both ways. The ECB began hiking with inflation close to 9% and then delivered 75bp moves in September and November 2022, so the Council knows that waiting too long forces larger and faster tightening. It also knows that transmission was nonlinear: the March 2023 banking stress broke with the deposit rate at 2.50%, well below its 4.00% peak, and the Council raised it to 3.00% days later amid the turmoil. The Transmission Protection Instrument (TPI) was announced alongside the first hike. The ECB therefore faces a trilemma, between inflation control, growth and financial stability, that no single rate can resolve.
Why markets break before the policy rate gets there. Transmission is nonlinear for four reasons. Markets price the destination in advance, so yields adjust well before the deposit rate does. Bank rates lag: August bank rates were 3.60% on house purchase and 3.77% on corporate loans (ECB, published 1 October), data that pre-date the September repricing; at the 2023 peak, with the deposit rate at 4.00%, the composite rates were 3.91% and 5.26% (October 2023). Refinancing walls and variable-rate resets concentrate pain in the borrowers least able to absorb it. And fiscal arithmetic compounds: for a sovereign with debt near 120% of GDP, a sustained 100bp rise in average funding cost adds about 1.2pp of GDP to interest costs once fully rolled over (illustrative). Equities and real estate respond through the discount rate and collateral values, which move with long yields, not with the policy rate.
The sovereign–bank–financial-stability loop. Higher sovereign yields mark down bank bond portfolios and raise funding costs; banks tighten credit; growth weakens and deficits widen; sovereign spreads rise again. The ECB’s tightening intensifies each link while TPI addresses only the spread link, and its eligibility depends on sound fiscal and macroeconomic policies. The loop is already visible at the margin: the OAT–Bund spread was about 133–142bp on 1–2 October, the widest since 2012, with the 10-year OAT near 4.94–4.95% (Bloomberg; Reuters data via ActionForex). From an ALM perspective, higher front-end rates support net interest income, but rising long yields erode the economic value of fixed-rate assets and sovereign holdings, and the net effect turns negative as sovereign stress rises.
Curve, term premium and global spillovers. The long end is already doing a large share of the work. The 10-year Bund, at about 3.4–3.6%, exceeds its 2023 peak of just under 3% even though the deposit rate is 150bp lower, while the 10-year Treasury yield closed at 5.28% on 2 October (US Treasury), the Fed has raised to 3.75–4.00%, the BoJ has reached 1.25% and the 30-year JGB has traded above 4%. That points to a global term-premium repricing in which the euro area is a price-taker. A tightening cycle normally flattens or inverts the curve at its peak. Here the likelier shape is bear steepening if sovereign or financial stress dominates and bear flattening if second-round evidence dominates; a combination of high inflation, weak growth and heavy issuance is the least benign for duration.
Table 2 — Four regimes
| Regime | Defining evidence | ECB reaction | Market transmission |
|---|---|---|---|
| 1. Temporary shock | Energy stabilises or falls; base effects lower energy inflation; services at or below 3%; wages decelerate | Hold at 2.50%; look-through reasserted | Bull steepening; partial spread retracement |
| 2. Persistent energy inflation | High energy prices persist; headline 3.5–4%; core drifts toward 2.6–3.0% without wage acceleration | Limited insurance hikes; growth drag acknowledged | Higher front end and term premium; wider credit and sovereign spreads |
| 3. Second-round effects | Services above 3.5–4%; compensation per employee back above 4%; core above 3% for several months | Restrictive stance required, toward the 2023 peak of 4.00% | Bear flattening; periphery and French spreads under pressure; housing and credit correction |
| 4. Inflation-regime shift | Longer-term expectations de-anchor; indexation spreads; core 4.5–5% or more | Magnitude comparable to 2022–23; the arithmetic lands in the 6.5–7.0% range | Disorderly: sovereign–bank loop, TPI tested, recession, credit events |
LBMR interpretation. Current evidence sits between regimes 1 and 2. Regime 4 is not our expectation, and the 6.5–7.0% range remains a boundary. The important observation is that financial constraints bind earlier: markets could reach regime 3 conditions in financial terms well before the inflation data justify it, and in regime 4 the ECB might be unable to deliver the full tightening the arithmetic called for.
The real analytical question is whether a prolonged energy shock could force the ECB into a reaction function comparable in magnitude to the 2022–23 tightening cycle. On current evidence the answer is no: that would require sustained underlying inflation of roughly 4.5–5%, double today’s core, through channels that remain contained. The more important finding is the asymmetry. The euro-area financial system would likely show strain far below the stress range, through the long end, sovereign spreads, bank balance sheets and housing, which means the ECB could be constrained even if the inflation arithmetic called for more. The ECB’s task is therefore to keep a one-off energy shock from becoming a regime before financial conditions force its hand, and our monitoring focus is on services, wages and expectations, not on oil prices.
lucabindi.com