Christian Noyer: The eurosystem's single monetary policy - a view from the
inside
Speech by Mr Christian Noyer, Governor of the Bank of France, at the GIC Conference hosted by the
Federal Reserve Bank of Philadelphia, Philadelphia, 18 January 2006.
* * *
Ladies and gentlemen,
It is a great pleasure and honour for me to address the GIC conference hosted by the Federal Reserve
Bank of Philadelphia.
Before entering into the heart of today's topic, given the date of this conference, it would be difficult for
me not to evoke the name and prodigious work of Benjamin Franklin who, to my mind, is the
embodiment of the American dream. I could devote the whole of my address to Benjamin Franklin's
work, both because of its scope and the significance that it still has today, but that is not the subject of
our conference. I shall therefore confine myself to recalling some of the major events and
achievements in the life of this exceptional, intelligent man, endowed with extraordinary intellectual
curiosity.
If I were to sum up the life of this exceptional man in a few words, I would say, like most people, that
he was an autobiographer, an essayist, a pamphleteer, a politician, a librarian, a publisher, an
educationalist, a scientist, an inventor, a statesman, and a humorist. It is difficult to believe that one
single man could be so multifaceted but Benjamin Franklin was all these things, and sometimes at the
same time. Benjamin Franklin is the very example of what was known at the time as an "honest man".
Benjamin Franklin showed a marked interest in Europe from a very early age. He started learning
French, Italian and Spanish (in addition to Latin) in 1733. He journeyed abroad and lived both in
France and England. I would like to stress his interest in France by pointing out that he was elected
Associé Etranger of the French Academy in 1772 and became Plenipotentiary Minister in Paris in
1779.
When referring to Benjamin Franklin, one often has in mind the great inventor, the philosopher, the
essayist or the polemicist but one often forgets to mention that he also published a number of
economic essays and studies. It is worth mentioning the book "Way to Wealth", which some people
consider as "the first American book on personal finance" or as "the best and the wisest money book
ever written... ".
As you can probably imagine, Benjamin Franklin's philosophy has crossed the Atlantic and still guides
decision-makers today, including at the European Central Bank.
In that regard, I would like to touch on a few ideas drawn from his autobiography. I need not remind
you of his great fondness for quotations, especially in Poor Richard's Almanack. In his autobiography,
Benjamin Franklin defined a number of virtues that he believed to be cardinal. They included
temperance, silence, order, resolution, frugality, industry, sincerity, justice, etc. I find his interpretation
of these terms interesting. For instance, for Benjamin Franklin, the term "temperance" should be
understood as follows: "Temperance first, as it tends to procure that coolness and clearness of head,
which is so necessary where constant vigilance was to be kept up...". This, to my mind, is one of the
virtues that central bankers must impose on themselves. My Eurosystem colleagues and I have made
it one of the guiding principles of our actions.
Benjamin Franklin continues his description of these virtues in the following terms "Frugality and
Industry freeing me from my remaining debt, and producing affluence and independence, would make
more easy the practice of Sincerity and Justice, ...,". He emphasises the importance of being freed
from one's debts and recovering one's independence. We know from his political activity that he
attaches a great deal of importance to the independence of the Nation, but here we are talking about
that of individuals and therefore of the institutions for which they are responsible. As we will see later,
this is the type of independence that lies at the heart of the Eurosystem. Furthermore, sincerity can be
associated with transparency, another key principle of the Eurosystem.
As in most human activities, the conduct of monetary policy involves some risk-taking and may,
justifiably or not, be subject to debate and criticism, as we will see later on. I would like to conclude
this brief tribute to Benjamin Franklin by quoting one of his phrases that makes an encouraging link
between success and risk: "there are many ways not to succeed, but the most certain is not to take
risks".
Let me turn now to my main topic which is to provide you with an overview of the Single monetary
policy of the Eurosystem that consists of the European Central Bank and the 12 national central banks
of euro area member states and of its main features and achievements.
Quite paradoxically,
- The single currency for a long time met with the scepticism from many observers, who regarded it as
unrealistic first to launch a new currency and second to envisage a single monetary policy for a group
of countries that, despite rapid convergence, continued to display major differences. Interestingly
enough, the assumption made by some observers and market participants that the entry interest rates
in the Euro on 1 January 1999 would be some kind of average of the interest rates of the composing
currencies proved to be wrong. On the contrary, and since the very construction of the Euro was
based on continuity with the most credible national currencies, it was foreseeable that interest rate
convergence inside the future Euro area would take place progressively on the basis of a merge of
different yield curves of the various currencies with the benchmark yield curve corresponding to the
most performing and credible ones, as it effectively happened.
- The recent nay votes from France and the Netherlands to ratifying the EU constitution rattled
Europeans concerns for the future. Some observers immediately conjectured that the single currency
was directly responsible for the muted economic performance of the euro area and publicly questioned
its durability; however, the track record of the Single monetary policy, after only 6 years of
implementation, has been really impressive: the inception of the euro has been associated with an
increased macroeconomic and price stability within the euro zone, despite an unusual sequence of
unfavourable events, adverse supply shocks and periods of global financial turbulences.
The point I would like to set out today is that a high degree of credibility, transparency and
predictability of the Eurosystem's monetary policy is a key condition for its efficiency.
I will provide you with an overview of the Eurosystem monetary policy strategy (part 1) and then will
assess its main achievements (part 2).
PART 1: The main features of the Eurosystem monetary policy strategy
Let us see what are the main features of the single monetary policy, conducted by the Eurosystem, in
terms of institutional and operational framework as well as on strategic issues themselves.
1. The institutional and operational framework is founded on modern concepts
Let me recall first that over the past decade, a large body of literature has been devoted to questions
surrounding central bank independence, the concepts of transparency and monetary strategies, and
the communication of monetary policy decisions.
Drawing on this analytical expertise and the experience of the national central banks of the
participating countries, the Eurosystem is first and foremost based on a modern institutional
framework, founded on the principles of independence, transparency and accountability and, lastly,
operational decentralisation.
1.1. The independence of the Eurosystem fosters price stability
The Eurosystem's primary objective, as enshrined in the Maastricht Treaty, is to achieve and maintain
price stability. As many empirical studies have shown, a country's ability to fight inflation appears very
closely correlated to the degree of independence of its central bank. The independence of the
European Central Bank and the 12 national central banks of the Member States of the euro area is
therefore anchored in the Treaty.
In operational terms, this means that, in the conduct of their duties, neither the European Central Bank
nor the national central banks of the Eurosystem may request or take instructions from the Community
institutions, national governments or any other body. They are entirely institutionally, operationally and
financially independent.
1.2. Transparency and accountability are also essential for gaining credibility
Naturally, the independence of these institutions requires transparency in their decision-making
processes and accountability vis-à-vis the general public and their representatives.
As regards new institutions such as the ECB, transparency is even more important for gaining
credibility and building up economic agents' confidence in the new currency. In order to establish this
credibility and gain the confidence of agents, it is imperative to be understood, which in turn calls for
transparency.
For the sake of transparency, the Governing Council has specified and quantified its definition of
price stability (inflation below but close to 2% over the medium-term).
Second, the ECB has gone beyond the accountability requirements laid down by the Treaty by
instituting regular testimonies by the President of the ECB before the European Parliament and regular
informal meetings with the Eurogroup of Finance ministers. Another channel for transparency is
constituted by the regular publication of reports on economic developments and Central Bank
analysis, of the Eurosystem's and ECB's staff projections exercises, most prominently in the ECB's
Monthly Bulletin.
Finally and most importantly, following monetary policy decisions, the President and Vice-President of
the ECB hold a press conference followed by an open discussion with journalists, the transcript of
which is published on the ECB's website. It should be recalled that the ECB was the first central bank
to adopt such a procedure, which provides a unique opportunity to fully explain and comment
monetary decisions immediately.
On the other hand, the Governing Council of the ECB has chosen not to publish the minutes of its
meetings. The publication of these minutes would indeed present some drawbacks:
- first, governing council members may "speak for the minutes" when these are very detailed, while,
when they are not detailed, may not convey more information than a plain communiqué;
- second, the publication of the minutes might also create more difficulties for moving from initial
positions to new ones in the light of the arguments developed;
- finally and most importantly, in the case of the euro area, the analysis of the votes could be read and
interpreted as reflecting national interests or preoccupations, which would be misleading and could
jeopardise both the independence of the members of the Governing Council and the credibility of our
decision-making processes.
1.3. The Eurosystem is based on operational decentralisation
The third imperative, operational decentralisation, is an essential feature of the Eurosystem.
According to this principle, monetary policy decisions taken in a centralised fashion by the Governing
Council of the ECB are implemented in a decentralised way by the national central banks.
Contrary to the US, the use of modern technology and communications has made it possible for
market operations not to be concentrated at a single geographical location, but to be carried out
simultaneously at all of the National Central Banks. The same type of arrangement applies in other
monetary areas (cash management, payment systems, etc.).
1.4. The Eurosystem benefits from an efficient operational framework
The operational framework is based on two main guidelines:
- a range of monetary policy instruments selected in accordance with the principles of an open market
economy, a level playing field, simplicity and transparency: these instruments enable the smooth
adjustment of banking liquidity and effective steering of short-term interest rates.
- procedures guaranteeing a high level of security for all interbank transactions and large-value
payments within the euro area and with other countries in the European Union, with in particular the
TARGET system, which played a predominant role in the integration process of the euro money
market.
2. The strategic framework also contributes to the efficiency of the single monetary policy
From the outset, there was a consensus among the designers of the Eurosystem that the Single
monetary policy would require a clear strategic framework. This framework can be characterised by
two main principles: a quantitative definition of price stability and a medium-term orientation of
monetary policy.
2.1. The quantitative definition of price stability has been clarified after five years of experience
The definition adopted by the ECB's Governing Council in October 1998 was confirmed and clarified in
May 2003 following an in-depth review of its strategic framework by the Eurosystem. In the wake of
this assessment exercise, the Governing Council specified that price stability was defined as an
annual increase in the HICP close to, but below, 2% over the medium term. Several remarks should
complement this definition:
- by specifying that inflation should be close to 2%, the Governing Council intended first of all to
confirm the symmetrical nature of its strategy by ruling out situations of deflation. This clarification also
makes it possible to take account of any possible measurement bias in the price index, as well as
inflation differentials within the euro area;
- the quantitative definition of monetary stability brings the Eurosystem's strategic framework close to
that of central banks that rely on inflation targeting, especially if a broad definition of the latter is
accepted, such as that expressed by the term "flexible inflation targeting". The big difference is in the
use made of forecasts derived from econometric models, which play a predominant role in "pure"
inflation targeting strategies, whereas they are only one component in the decision-making process of
the Governing Council of the Eurosystem;
- especially in the early days, we were confronted with substantial criticism regarding our definition of
price stability, considered by many observers as too ambitious. Two points are worth mentioning at
this stage:
- First, due to the scepticism I already mentioned and for credibility reasons, it would have been
damaging for the euro not to build on the credibility of the most efficient and successful participating
national central banks, that had previously chosen 2% as the ceiling for their definition of price
stability;
- second, this criticism has abated recently and it is interesting to note that the definition of price
stability has converged towards a level close to, if not below, 2%: in December 2003, Gordon Brown
announced a new inflation target for the Bank of England, based on the HICP, and set at a level of 2%
for the 12-month increase; in the US, Ben Bernanke, recently appointed to take over A. Greenspan at
the end of the month, advocated for a quantitative definition of the FED's price objective comprised
between 1 and 2% over the medium-term.
2.2. The Eurosystem's monetary policy is "medium-term" oriented.
What exactly are the implications of the medium-term orientation of the Eurosystem's monetary policy
strategy?
ex
The first is that the single monetary policy does not have a fixed horizon, defined once and for all
ante, but aims, as far as possible, to take account of the "long and variable lags of monetary policy"
dear to Milton Friedman. Taking account of this uncertainty is particularly important in the case of the
euro area, whose "deep structural parameters" are somewhat uncertain to the extent that the inception
of the euro may have been associated with a "regime shift".
More prosaically, this medium-term orientation of the single monetary policy recognises that it is
impossible for a central bank to control price developments with accuracy over the short-term.
The second implication is that the relevant indicators for monetary policy must reflect, almost
exhaustively, the main sources of both short and long-term inflation. In the light of this, the monetary
policy strategy seeks, as far as possible, to rely on a "full information approach".
This is what the concepts economic analysis and monetary analysis - also known as the two-pillar
approach - used notably at the press conferences given by the ECB President following monetary
policy decisions, reflect:
- the economic analysis examines cyclical, economic and financial indicators related to the main
determinants of short-term inflation;
- the monetary analysis, is based on a monetary explanation of long-term inflation. It is signalled by the
announcement of a reference value, which is not a committing target, of 41⁄2% for the annual growth of
the broad money aggregate.
- The medium-term orientation of the single monetary policy makes necessary the cross-checking of
these two complementary approaches. From this point of view, the ECB's monetary policy strategy is
more comprehensive than pure inflation or monetary targeting strategies.
External observers sometimes criticise the complexity of the Eurosystem's monetary policy strategy
and argue in particular that the monetary pillar or analysis does not provide any useful information for
our monetary policy decision. It is considered by some as superfluous, confusing if not as an obstacle
to transparency.
To give money an important role in its monetary policy analysis and strategy is however quite a natural
thing for a central bank geared towards price stability to do, as inflation is "ultimately always and
everywhere a monetary phenomenon", to quote again Milton Friedman. It is worth mentioning that, in
our set-up, with a clear medium-term focus, the Eurosystem does not need or have to react
mechanically to short-term deviations of monetary growth from the reference value. Instead, monetary
developments, i.e. both the developments of the components of M3 and of its counterparts, are
analysed very carefully in order to examine and extract their information content for future inflation.
* * *
PART 2: The achievements of the Eurosystem's monetary policy
What preliminary assessment can we make of the first six years of the single monetary policy? I would
like to underline the following points, considering successively price stability, macroeconomic stability
and convergence, monetary stance and predictability.
1. The achievement of the overriding policy objective: price stability
Confronted with a series of adverse exogenous supply shocks (affecting in particular oil prices, food
products and services prices) leading to a rise in the HICP of above 2% in year-on-year terms from
2000 to 2002, the level around which the HICP has hovered since, the Eurosystem has been able to
achieve its main objective: since the Eurosystem became responsible for monetary policy in the euro
area, HICP inflation has averaged 2%, which is near to the "close to but below 2%" at which we aim
over the medium term. Let me remind you that HICP inflation was around 4% in the 1980's and about
9% in the 1970s [see Figure 1].
Until recently, the single monetary policy also succeeded in stabilising and anchoring medium to
longterm inflation expectations at around 1.8% to 1.9%, despite all the above mentioned shocks. That is to
say, once again, at a level close to, but below, 2% in accordance with our definition of price stability -
Consensus
whether one takes the inflation expectations derived from surveys (for example, Forecast,
or the ECB survey of professional forecasters - [see Figure 2] ) or those drawn from market data,
notably index-linked government bonds. Recently, the awareness of a durable higher cost of oil has
pushed expectations slightly above 2%. The last December key ECB interest rate's hike has however
brought these market expectations back to 2% that is to say in line with our definition of price stability
over the medium term.
2. Macroeconomic stability and convergence
Price stability has not come at the expense of higher unemployment. Moreover, there are no visible
signs of costs in terms of higher real macroeconomic volatility. Quite on the contrary, the volatility of
real variables has declined relative to the averages observed during the 1980s and 1990s.
Does one size fit all? It is often argued that a single monetary policy combined with inflation
differentials leads to different real interest rates across countries, which in turn may destabilisize the
currency union by creating divergence in output growth that exacerbate inflation differentials. This is by
no way what we have observed:
First, inflation dispersion among the euro area countries (measured as the unweighted standard
deviation of annual HICP inflation rates) amounted to slightly less than 1 percentage point in 2005
compared to around 6 percentage points in the 1990's. Since the inception of the euro, the average
inflation dispersion across the euro area countries has been around 1 percentage point. This figure is
very close to the dispersion observed across the 14 US metropolitan statistical areas.
Concerning growth differentials, euro area averages naturally mask a variety of growth performances
of individual countries within the single currency area, especially in a context where structural
convergence has not been completed yet. Growth dispersion is a natural phenomenon in any large
economic area. Looking at the main trend, the degree of dispersion in real GDP growth rates across
the 12 euro area countries declined somewhat in 2004 (in annual average terms) to a historically low
level (1.4% as measured by the unweighted standard deviation), while it had been fluctuating around
2% since the 1970s. By comparison, the dispersion of real growth rates across the eight US statistical
regions fluctuated around an average of 1.5 % between 1990 and 2002.
This is not surprising since some stabilisation channels are at work in a currency area: in particular, a
credible monetary policy should bring about a convergence of expected inflation towards the definition
ex ante
of price stability, leading progressively to the convergence of real rates across the area;
moreover, lower inflation relative to other trading partners increases price competitiveness, which in
turn counteracts the initial effect of higher real interest rates.
3. Appropriateness of the monetary policy stance
Has the monetary policy stance been appropriate? To try answering that delicate question, the
literature of central bank watchers or observers has mainly focused on Taylor-type rules as a usual
benchmark.
Despite numerous caveats, such an approach can be very informative as it addresses several relevant
issues such as: is the monetary policy decision process rule-based or rather discretionary? To what
extent is the central bank too focused on price stability at the expense of, say, growth and
employment? Is the central bank forward-looking or rather "behind the curve"?
These are actually some of the recurrent criticisms I have heard about the Eurosystem's monetary
policy: too obscure, too narrow-focused, too late. Figure 3 displays a forward-looking Taylor-type rule
for the ECB's minimum bid rate. As an overall assessment, the Taylor-type rule closely matches
Eurosystem's monetary policy decisions.
Under the proviso that this rule provides a good benchmark, it is quite unclear why the Eurosystem
has attracted so much criticism: in particular, the output stabilisation "objective", as encapsulated in a
standard Taylor rule, has not been overlooked by the overriding objective of price stability. In that
regard, one should be aware that, in the euro area as elsewhere, price stability aims at providing the
highest sustainable growth and employment in the longer run; finally, the decisions have been taken in
a timely fashion, the Eurosystem conducting its monetary policy in a forward-looking and pre-emptive
way.
However, the same figure shows that policy decisions deviate from time to time from the Taylor rule
benchmark. Actually, being rule-based doesn't imply being rule-bound and monetary policy decisions
are not taken on the basis of mechanical rules.
I already mentioned the Eurosystem adopted a full-information approach, which besides the usual
array of economic and financial indicators also gives a key role to monetary analysis not factored in
usual Taylor rules.
Figure 4 illustrates the importance of such an approach in the context of our monetary policy
decisionmaking process. It shows that the policy stance is also underpinned by the information stemming from
our monetary pillar:
- From 2001 to 2003, the annual growth of M3 was well above its reference value. However, an
indepth analysis of M3's components and of its main counterparts showed that the dynamics of M3 was
mainly due to extraordinary portfolio shifts into M3, in a context of heightened economic, financial and
geopolitical uncertainty. This implied low medium-term risks for price stability, as captured by the
monetary indicators presented in figures 4 and 5, and allowed the Eurosystem to enter an easing
cycle.
- The situation has changed since the second half of 2004 as reflected by the monetary indicators:
first, broad money aggregates accelerated in parallel with increasing demand for loans to the private
sector; second, this acceleration was mainly driven by the most liquid components of M3, pointing to a
significant impact of low interest rates on monetary dynamics. Furthermore, the growth of borrowing,
especially mortgage loans, remained very robust, fuelling a sharp increase of housing prices across
the euro area. In such a situation, the risks revealed by the monetary analysis to price stability over the
medium-term were strongly revised upward.
4. Predictability and frequency of policy actions
Contrary to some preconceptions, most monetary policy decisions have been perfectly anticipated by
the markets. This assessment derives from studies conducted by the Eurosystem but also from the
reports published by "ECB Watchers", with whom, incidentally, the ECB has regular contact, notably in
the context of annual conferences.
Figures 5 and 6 show for example that on average, the Eurosystem's monetary policy decisions were
anticipated by financial markets, whatever their orientation, at least two weeks in advance, and fully
factored in at least a week before.
A comparison with the Fed, moreover, does not reveal significant differences between the two
institutions with regard to the ability of markets to anticipate the monetary policy decisions of the two
institutions. This point to the transparency of the single monetary policy. In particular, the fact that
the ECB has chosen channels other than the publication of minutes of the meetings of the Governing
Council has not prevented it from reaching a high level of predictability.
As regards the frequency, since the inception of the euro in 1999, the Eurosystem has changed its
policy rates 16 times (8 cuts, 8 hikes), which is on average close to the usual average frequency of
interest rate changes1
However, compared to the Federal Reserve, in particular since 2001, the frequency of the changes is
by far lower. Does this necessarily imply that the Eurosystem does not move enough or too low? I
think there is a broad agreement on the fact that interest rate decisions are state-dependent rather
than time-dependent and as a consequence, both the frequency and the amplitude of the policy
changes are mainly driven by the underlying state of the economy.
As far as the Eurosystem is concern, the more gradualist approach is nothing but the reflection that
the economy of the euro area has been less affected by cyclical fluctuations than the US economy.
Moreover, recent research carried out by the Eurosystem on inflation persistence tends to show that
the degree of inflation persistence in the euro area is quite moderate while the degree of price
stickiness is considerable and higher than in the United States. This finding may provide another
justification for a gradualist monetary response to cost-push shocks as: first, the impact of an inflation
shock will be small as agents anticipate a low persistence of this shock and therefore will reduce their
expectations of future inflation; in turn, the negative response of the output gap will be limited implying
a less persistent response of the real rate.
5. As a result, the Eurosystem monetary policy has won European citizens' confidence in and
acceptance of the new currency
Finally, the euro has been readily accepted by economic agents and is now part of European
consumers' daily lives. Surveys confirm that the general public has confidence in the euro, as a solid
currency, and in the Eurosystem as their Central Bank.
However, there remain two causes for concern:
- one is the natural difficulty in moving to an entirely new set of price references - and it may take a
number of years before this switch is fully made by the public at large.
- and the second, probably related to the first one, is the feeling in the public that there have been
excessive price increases linked to the cash changeover. Indeed, the public's attention has focused on
a small number of goods and services in which abnormal increases occurred at the time of this event,
leading to a misperception of the real rate of inflation. This gap between perceived inflation and real
inflation has however been narrowing progressively and should hopefully disappear in the near future.
Concluding remarks
To conclude, let me emphasise that seven years after its adoption, the euro has lived up to all of our
expectations. After the unprecedented challenge of a continent-wide cash changeover, the euro
almost instantly replaced the legacy currencies without any disruptions.
It has fostered both price and macroeconomic stability through its credibility and has shielded many
euro area countries from significant exchange rate volatility and financial market turmoil. It is all the
more important to acknowledge these achievements since it was said in some quarters that the euro
would never see the light of day or that it would create severe economic disruptions. Those scenarios
have not materialised.
In the post-war European adventure, the euro represents a major milestone. That said, and whatever
its own merits, a currency is not an end in itself, even though the new EU members are keen on
adopting it as soon as possible. Entry into Monetary Union must be founded on a sustainable
convergence process. Enlargement of the euro area also gives renewed impetus to addressing the
challenges ahead as it makes it more pressing for policy-makers to tackle long-ignored weaknesses.
This is a crucial contribution to building a stronger EU, in which I strongly believe.
All in all, let me express my confidence in the future of the euro and of the single monetary policy of a
large Eurozone.
Figure 1: HICP inflation in the euro area
16
14
12
10
8
6
4
2
0
-2
1971 1973 1975 1977 1979 1981 1983 1985 1987 1989 1991 1993 1995 1997 1999 2001 2003 2005
Source: ECB - M. Ehrmann and F. Smets (2005).
Note: The chart shows quarter-on-quarter (red) and year-on-year (blue) inflation, and its average value
over three sub-periods that have been identified by breakpoint tests.
Figure 2
ECB Survey of Professional Forecasters: Expected inflation at various horizons (average)
%
2,8
2,6
2,4
2,2
2,0
1,8
1,6
1,4
1,2
1,0
1999q1 1999q3 2000q1 2000q3 2001q1 2001q3 2002q1 2002q3 2003q1 2003q3 2004q1 2004q3 2005q1 2005q3
n n+4 Q+4 Q+8
Source: ECB - Production: Banque de France - update October 2005.
Figure 3:
ECB minimum bid rate and the Forward looking Taylor rate
6
5
4
3
2
1
0
15/03/2001 15/09/2001 15/03/2002 15/09/2002 15/03/2003 15/09/2003 15/03/2004 15/09/2004 15/03/2005 15/09/2005
ECB repo rate Forw ard-looking taylor rate (neutral rate : TV natural rate MM3)
Source: ECB - Production: Banque de France
Note: The forward-looking Taylor rule is computed using the standard 0.5 weights for both the inflation
and output stabilisation objectives. The inflation objective is set according to the ECB's definition of
price stability, that is to say a rate of inflation close to, but below, 2% over the medium term (1.8% in
this application); The output gap and the neutral rate, which is a time-varying short- term natural rate,
are both derived from Mesonnier and Renne (2004). Inflation expectations are updated according to
t