Lorenzo Bini Smaghi: Financial stability and monetary policy -
challenges in the current turmoil
Speech by Mr Lorenzo Bini Smaghi, Member of the Executive Board of the European Central
Bank, CEPS joint event with Harvard Law School on the EU-US financial system, New York,
4 April 2008.
* * *
1. Introduction1
Ladies and Gentlemen:
It is an honour and a pleasure for me to speak at this event today.
It's now over 7 months since the start of the financial turmoil. People are starting to ask - and
rightly so - how long it will last and what policy-makers are doing about it. While I will not
dare to answer the first question, I will endeavour to address the second one by focusing
primarily on the conduct of monetary policy, which is the main task of central banks.
What I would like to explain first is that central bankers get little help from the economic and
financial literature to guide their actions. Indeed, there is little analytical background that can
give definite guidance for assessing the relationship between price stability and financial
stability, and the impact that monetary policy can have on financial flows and stocks.
On this basis it is not possible for policy-makers to formulate precise policy rules, rather only
general considerations and warnings as guidance for their actions. I will elaborate on some
of these today.
Finally I will draw some general conclusions on how central banks should behave in the
midst of turmoil, such as the episode we are currently experiencing.
2. Models of financial stability
To analyse the relationship between monetary and financial issues we should ideally have at
our disposal a dynamic general equilibrium model containing at least three elements:
•
First, forward-looking economic agents who think in an intertemporal manner;
• Second, a set of non-zero (gross and net) financing positions across the main
sectors of the economy, most of which are based on nominal debt;
• Third, a description of agents' incentives towards, and capability of, respecting, or
defaulting on, their financial obligations in the face of different possible shocks.
Unfortunately, the macro literature typically uses general equilibrium models that feature
highly stylised financial sectors. The reason lies in the steep trade-off faced by modellers
between capturing an environment of sophisticated and constantly evolving financial
products and the complexity of embedding the financial structure in a general equilibrium
framework. Only recently a branch of the literature has started integrating the banking
system in DSGE models.2
One main shortcoming of the macro models currently available for the analysis of financial
stability is that intermediaries are typically assumed not to face risks. Risk arises in firms'
production processes (or in households' ability to earn income) and affects the ability of firms
(or households) to repay their debt. However, it is generally assumed that intermediaries can
"diversify away" the risk by lending to an arbitrarily large number of economic agents. Current
models are thus not able to capture situations in which the financial distress of a subset of
firms (or households) may lead to bank failures as a result of an inability to repay deposits or
other types of bank debt instruments. Paradoxically, this was also the general assumption
that many market participants had before the start of the turmoil, namely that financial risks
were so well spread throughout the economy that financial contagion within the industry
would be minimal.
Another failing of the existing macro models is that financial frictions affect firms (or
households) and limit their ability to raise external finance, but not banks' fund-raising
activity. Banks are generally assumed to be able to collect deposits from households and to
distribute them without delay to firms in the form of loans. Clearly, this assumption is a
simplification of reality. First, it misses out the maturity transformation role of banks. Second,
banks also need to raise long-term finance in the market, where they face similar financial
constraints to the ones faced by firms. In addition, they face regulatory constraints, such as
the Basel requirements, when accessing short-term liquidity on the interbank market.
With these limitations in mind, what does the existing literature tell us about the relationship
between financial stability and price stability?
The conventional view is that there is no conflict between price stability and financial stability.
The achievement of price stability over the medium term is sufficient to prevent financial
crises.3 Historical evidence, however, points to several episodes - in addition to the current
turmoil - where periods of price stability have been accompanied or followed by sharp
financial imbalances. One example is the US Great Depression in the 1930s. Prices were
essentially stable for most of the 1920s in a context of buoyant economic growth, while by
the end of the decade the economy underwent a period of protracted deflation, massive bank
losses as a consequence of accumulated debt, sharp reductions in employment and a
severe recession. Also before the outbreak of the current turmoil the Great Moderation and
the Great Disinflation had been widely applauded. The lesson one can draw is, maybe, that it
is better not to be too complacent in good times.
Some literature has recently been published that considers a potential trade-off between
price stability and financial stability.4 Price stability is deemed to be the optimal target to
reduce the misallocation of resources across various goods-producing sectors. However, this
result holds only in the absence of asset price shocks. If there is a shock to asset prices,
particularly when the shock is unrelated to fundamentals, stabilising asset prices reduces the
distortions that may affect investment decisions.
Recent quantitative studies have shown that price distortions are more damaging than asset
price distortions; under plausible calibrations of the model, maintaining price stability in the
goods sector (as opposed to stability in asset prices) is found to be preferable.5
There is no doubt that some of the factors I have just described have played a role in
determining portfolio allocation and investment trends in advanced economies. In past years
- and right up to the outbreak of the turmoil - the ECB and other central banks had
repeatedly warned of the excessively low pricing of risk.6
On the empirical side, recent ECB research7 has analysed the role of various indicators
(such as consumer price indices, residential property prices, asset prices, broad and narrow
money and credit) in predicting the occurrence of episodes of financial turbulence and their
output costs. Using quarterly data for 18 OECD countries since the 1970s, the study provides
evidence of a robust positive correlation between money and those aggregate asset price
booms that lead to more costly recessions in the bust phase. It is found that liquidity shocks,
if defined with respect to broad money, contribute to explain the size of the post-boom
recession. Moreover, liquidity shocks are the most robust explanatory factor of residential
property price developments during boom episodes. Interestingly, the information value in
broad money is particularly high in episodes of asset price booms, whereas over the entire
sample liquidity shocks turn out to be significantly less important.
3. Monetary policy and financial stability
Given the imperfect status of the economic literature, despite notable recent advances, what
should monetary policy do with respect to financial stability? Experience suggests a few
general considerations that central bankers should take into account in the conduct of
monetary policy. I will mention four.
The first consideration is that monetary policy can itself produce negative effects on financial
stability. As doctors are used to say, first try to do no harm.
To understand this concept, we need to recognise that monetary policy can, via the interest
rate, affect the intertemporal allocation of resources by influencing agents' incentives to
borrow. However, there is a limit to this because economic agents cannot go on borrowing
unlimited amounts from the future indefinitely. Therefore, it is important to realise that the
capacity of monetary policy to influence the intertemporal allocation of resources is
constrained, particularly by the situation of agents' balance sheets. An agent - or a sector of
the economy - that contracts a net debt has implicitly chosen to bring forward resources to
the present, thus reducing them in the future, in order to pay off that debt (provided, of
course, that it does not intend to renege on its debt obligations!). Financial stability can be
defined as a situation in which the intertemporal allocation of resources is felt to be "in
equilibrium" or "sustainable", which means that it is at the same time in line with the desires
of individual agents and with the need to keep up with the debt obligations that have been
subscribed.
The central bank should not create the incentives for private agents to accumulate debt
continuously over time. Such an over-accumulation, especially in good times, may jeopardise
its sustainability. Private agents - no differently from the public sector - may experience
solvency problems. We know that low lending rates tend to encourage banks to increase
risk-taking,8 especially when low rates are coupled with strong financial innovation.9 For
instance, when a financial institution has promised its creditors high rates of return but then
faces a period of low interest rates that is expected to last for a long time, the only option
open is to take on additional risk. Another example relates to the typical compensation
contract for investment managers, which depends particularly on the annual return achieved
(in excess of an agreed minimum). When risk-free returns are high, compensation is also
adequate when managers take on little risk. However, when these returns are low, managers
need to take on higher levels of risk to achieve sufficient compensation. Moreover, in times of
low interest rates, the low cost of funds encourages managers to increase leverage, further
increasing their exposure to risk.
In short, what we have learned in the past few years is that by promoting interest rates that
are too low, monetary policy may create incentives that put at risk financial stability.
The second consideration is that it is very difficult for central banks to take financial stability
issues into consideration in the conduct of their monetary policy. A fundamental problem is
that the economics profession is still far from having a good understanding of asset price
bubbles. Indeed, we still do not know whether they exist at all!10 One can certainly argue that
they are likely to occur in market economies. It takes, at most, a couple of small, realistic
modifications to the standard models of intertemporal optimisation, such as the introduction
of a subset of agents with a finite horizon, for bubbles to be generated.11 However, there is a
great difference between suspecting that bubbles exist and identifying them in real time.
Running policy on something that is essentially unobservable is, for sure, not a recipe for
success.
Neither do we have a good grasp of the sustainability of the balance sheets of households,
firms and financial institutions in the same way as we have for the sustainability of public
finances. This is probably a relict of a time in which financial markets were severely
repressed and only the government was "free" to borrow without limits and, by so doing, to
push its intertemporal budget constraint to the limits of sustainability. But now we live in a
completely different financial order, one in which borrowing is open practically to anybody -
at least in developed countries - with assets being created with a rating similar to that of the
best public borrower. This could also push private agents' intertemporal budget constraints to
the limits of sustainability and, in a sense, put financial stability (as defined a little earlier)
constantly at risk. If we knew, for example, that net household debt above, say, 100% of
household income was not sustainable, then we would have a clear idea of its future
consequences and the optimal policy response would flow naturally from this recognition.
However, we are certainly not there yet.
The third general consideration, which is partly contradictory to the previous one, is that a
monetary policy that neglects potential financial stability problems is likely to be time
inconsistent. Indeed, asset bubbles are generally easier to identify when they burst than
when they are forming. Unusual rises in asset prices may often be associated with changes
in fundamentals (much in the same way as the "new economy" type of stories), while
collapses are typically seen as something pathological. This tendency partly reflects human
psychology, which leads people to believe more in good events than in bad ones - a
phenomenon known as "cognitive dissonance".12 Therefore, a tale of fundamental and
lasting positive changes in the economy that underpin high asset valuations may be given
greater credence than a sobering, temporary tale explaining a downturn. For instance,
positive productivity shocks in the upturn tend to be considered permanent, whereas
negative shocks linked to a slowdown are considered temporary. To the extent that the
monetary authority shares the current preferences of the private or the government sector, it
may hesitate to react to the asset price bubble in the expansionary phase but will react
strongly in the bust phase. Such asymmetric behaviour can be seen as reflecting a higher
weight in the central bank's loss function to negative deviations of (asset price) inflation from
target than to positive ones. Over time, an asymmetric loss function would lead the central
bank to target asset valuations that are above their potential levels, in the same way as
having an asymmetric loss function on output leads the central bank to target a level of
output that is above potential.13 As is well known in the literature since the seminal work of
Barro and Gordon in the eighties, if the private sector rationally anticipates this behaviour by
the central bank, the end result is only a higher rate of inflation.
The fourth and final consideration is that when financial stability is at risk and markets are in
turmoil, the behaviour of economic and financial variables may experience a series of
nonlinearities that may impair the effectiveness of monetary policy. This means not only that
monetary policy might become less effective in achieving price stability, but also that it could
have perverse effects on financial stability itself.
I will consider two cases.
The first case occurs when the market turmoil has been caused by excess debt accumulation
by households and firms, as a result of very low interest rates over a long period. When the
bubble bursts, and agents are overburdened with a high level of debt, the interest rate tends
to loose its effectiveness as an instrument to smoothen consumption and income. This is
particularly the case when the assets that agents hold against their debts are not very liquid.
A lowering of interest rates is unlikely to be effective in raising the value of the assets or in
inducing agents to increase their borrowing and thus consume more. The anticyclical
effectiveness of monetary policy tends to be impaired. This issue tends to be underestimated
in the literature, although it is widely recognised in the case of fiscal policy. Indeed, it can be
easily shown that, in a public debt crisis, there is little or no margin for manoeuvre for
budgetary policy to stimulate the economy. Given that economic agents and financial
markets have accumulated an excessive amount of public debt, they are no longer willing to
absorb more. When the crisis is one of private debt, monetary policy can hardly induce
agents to borrow more. This may be the reason why financing costs have recently increased,
especially at long maturities, in spite of the fall in short-term interest rates.
The second case of policy ineffectiveness is one where there is an alternative risk-free asset
in which agents can invest in the midst of a period of turmoil. In a closed economy, cash is
considered the only risk-free asset. By reducing the rate of return on cash, the incentive to
hold riskier assets increases. This should contribute towards stabilising money and financial
markets and asset prices. In an open economy, however, an excessive reduction in interest
rates can induce agents to shift to foreign currency investments, which reduces the relative
price of domestic assets compared with foreign asset prices. If confidence in the domestic
currency is impaired, a policy of reducing interest rates might have perverse effects on the
stability of the domestic money markets since it leads to an outflow of funds and a sharply
weaker exchange rate. Ronald McKinnon has recently explained that the closed economy
model traditionally used to analyse the US economy may no longer be entirely valid.
To sum up, excessively pro-active monetary and fiscal policies may induce the public and
private sectors to accumulate excessive amounts of debt. When debt becomes
unsustainable, and agents have to curtail their consumption to repay it no matter what,
monetary and fiscal policies tend to lose their effectiveness in smoothening consumption and
income growth. When a debt crisis occurs, the only role that monetary and fiscal policy can
fulfil is one of redistribution - rather than stabilisation - by "socialising" the debt burden. The
way in which monetary policy can redistribute the effects of the financial crisis is through an
inflation tax which reduces the burden of net debtors and the wealth of net creditors. In sum,
an expansionary monetary policy is successful in reducing the burden of the debt only to the
extent that it generates unexpected inflation. This is evidently not in line with central banks'
primary responsibility.
4. Policy implications
Given these considerations, how can central bankers best conduct monetary policy in a
period of financial turmoil? I believe that the available literature and recent experience
suggest three main principles and seven recommendations, which I would like to leave with
you as food for further thought.
The three principles are as follows:
First: effectiveness. Monetary policy should aim to achieve what it can do most effectively
with its main tool, the interest rate, and avoid taking on tasks that can be better performed by
others.
Second: consistency. In addressing any problem, monetary policy should avoid sowing the
seeds of the next crisis. In other words, the central bank has to take into account the future
consequences of its actions, particularly with regard to agents' incentives.
Third: predictability. In a period of high uncertainty, monetary policy should avoid creating
additional uncertainty and contribute to restoring confidence.
The implementation of these three principles affects not only the way the central bank should
act but also how it communicates with financial markets and the public at large. In this
respect the following recommendations can be made.
First, since the central bank has only one instrument through which to implement its
monetary policy, it should have one priority, which is price stability. Having one objective
avoids confusion about multiple - shifting - targets, helps anchor expectations and makes
accountability easier. This is now a broadly established practice, and in nearly all advanced
economies the central bank has price stability as its primary objective. It is certainly the case
of the ECB.
Second, the central bank should not target asset prices but should take asset prices into
account in forecasting inflation and in assessing whether the economy is embarking on
unsustainable debt accumulation. This requires central banks to pay particular attention to
developments in the financial and credit markets and to look closely at firms' and
households' balance sheets. In the ECB's strategy, these indicators are an integral part of
the monetary pillar, which complements the economic pillar used to forecast inflation. Recent
events have shown the importance of looking at monetary and financial indicators with a view
to identifying risks to price stability over the medium term. This has long been
underestimated, particularly in the academic world, where monetary analysis is no longer in
fashion.
Third, the central bank should conduct its monetary policy with a medium-term horizon.
There is now ample research showing that, when monetary policy is used to fine-tune the
economy, there is a high risk of increasing - rather than decreasing - income and inflation
volatility. There is also a risk of adding to financial instability. A key element in determining
interest rate policy should be the anchoring of inflation expectations. The ECB has
repeatedly stated that its policy aims to prevent relative price increases, such as those
produced by energy and food price rises, from giving rise to a permanent inflationary trend.
The credibility of the ECB's anti-inflation commitment is the best guarantee for keeping
interest rates low over the medium term, which in turn contributes to growth and
employment.
Fourth, the central bank should have a high degree of independence to achieve its primary
objective. This is the only way to protect the central bank from the phenomenon of "cognitive
dissonance", which I mentioned previously. In particular, central bankers should have
adequate security of tenure, so that the horizon for setting their policies is sufficiently long as
not to be influenced by short-term opportunistic behaviour by the private and public sector
alike. For example, the mandate of the ECB's President and Executive Board is for 8 years,
non renewable.
Fifth, whenever problems concerning financial stability emerge, the central bank should
explicitly identify the limits and confines of its responsibilities. The biggest risk for a central
bank in case of turmoil is that it is pressed to take over responsibilities that are typically not
its own, particularly to address solvency problems. The central bank should instead be
responsible for ensuring an adequate functioning of the money market and for stabilising its
key operational target. This is what the ECB has done, by intervening with its main
refinancing operations with a view to stabilising the overnight rate around the reference
policy rate. The ECB will continue this policy, which implies that market participants with
adequate collateral will be able to finance themselves overnight, either with their
counterparties or directly with the ECB at rates close to the reference rate. Banks do not
seem to having fully understood this policy as they continue to bid for liquidity in the weekly,
three month and six month ECB tenders at much higher interest rates, apparently pricing in a
risk that does not exist at all.
Sixth, the central bank should, within the limits of its competencies, be put in the best
conditions in order to conduct effectively operations that aim to foster liquidity in the money
market. This requires, in particular, the central bank to have access to any necessary
information concerning the liquidity and solvency problems of the markets and individual
institutions. This infers that, when the central bank does not have direct supervisory
responsibilities, it should receive such information in a timely fashion from the competent
supervisory authority. Furthermore, banking supervisors should exert strong pressure on
financial institutions to disclose in a prompt and coherent fashion their balance sheet
situations. This is key to restoring the confidence of market participants both in themselves
and in the market. In the European context, cooperation among supervisors should be
strengthened. More important, those euro area countries where there are still legislative
obstacles for the supervisors to provide information to the ECB on specific banking and
financial institutions should act promptly to remove them as soon as possible. These
obstacles stand in the way of an optimal provision of liquidity to the markets.
Seventh, in addressing problems of financial stability, the central bank should use
instruments that are clearly distinguished from the instrument used for monetary policy. The
level of the interest rate is the main instrument for achieving the primary objective of price
stability and should thus not be used for other purposes. The appropriate functioning of the
money markets can be achieved through different means, such as the provision of liquidity to
institutions and markets, against adequate collateral. The exchange against sound collateral
ensures that the central bank is not directly involved in bailing out banks. This avoids moral
hazard and prevents the central bank from distorting the process of price determination,
including loss discoveries. This is a well known principle established by Bagehot in 1872. Let
me close here with this reference to Bagehot, which suggests that after more than 130 years
and despite several financial crises the basic principles of central banking have not, and
should not be, fundamentally changed.
Thank you for your attention.
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