T T Mboweni: Monetary policy and the markets - a two-way street
Address by Mr T T Mboweni, Governor of the South African Reserve Bank, at the Star/Safmarine
Breakfast, Johannesburg Country Club, Johannesburg, 7 September 2006.
* * *
Honoured guests
Ladies and gentlemen
1. Introduction
Central banking has come a long way since the days, not too many years ago, when monetary policy
was shrouded in secrecy. Central bank communication was akin to deciphering an obscure biblical
tract, and monetary policy very often surprised the markets. It is almost unbelievable that as recently
as 1994 the US Federal Open Market Committee (FOMC) did not even announce the monetary policy
decision, let alone the justification thereof, and it was left to the market to infer from the Fed's actions
in the market whether or not there had been a change in the monetary policy stance. The monetary
economist, Karl Brunner, was most scathing in his criticism and in 1981 argued that the peculiar
mystique surrounding central banking thrived on the pervasive impression that central banking was an
esoteric art confined to the initiated elite. He further added that "the esoteric nature of the art is
moreover revealed by an inherent impossibility to articulate its insights in explicit and intelligible words
and sentences".
As we know, things are very different today. The pendulum has swung in the opposite direction,
prompting Alan Blinder, a former Vice-Chairman of the US Federal Reserve System, to refer to it as
the 'quiet revolution'. Much of the debate about communication now focuses on the issue of whether
central banks can be too transparent. Notable economists in the field such as Blinder and Lars
Svensson argue for maximum transparency, while others, for example Frederic Mishkin, argue that
there are limits to transparency. I will argue today that transparency and communication are a function
of the decision-making process and particular institutional features, which in effect means that no
single approach can be regarded as 'best practice'.
In looking at issues such as transparency and communication, the point must also be made that
communication is a two-way street. Making monetary policy also involves giving attention to signals
coming from the market. Indeed, the argument is sometimes made that the central bank should simply
follow the market, raising the question of who takes the lead.
2. Communication from the market to the Bank
It is generally agreed that there is much market information of a forward-looking nature that is
extremely useful for monetary policy. Sometimes central banks will follow market movements which
can provide information about the outlook that is independent of policy and that is crucial to monetary
policy decisions. Prices and interest rates incorporate all information available to the market, and
therefore provide important signals about the future. True, there are times when the central bank may
have information that is not in the public domain, but equally, many private sector institutions are privy
to certain information, or may have superior information because of specialised research in a particular
area. Hence a two-way flow of information does exist in practice.
The Bank therefore takes market information very seriously and we look at a number of
forwardlooking indicators. These include the forward rate agreements (FRAs), the yield curves and yield
spreads, break-even inflation rates, the Reuters consensus forecasts and the implied forward
exchange rate curves, to name a few. We are also in the privileged position to receive a wide range of
detailed in-house research from domestic and international financial institutions. These give us some
indication of market expectations concerning various variables.
There is a rich literature on the information content of yield curves. The generally accepted wisdom is
that monetary policy determines the very short end of the curve to a significant degree. However
monetary policy does not determine the long-term rates. These are determined by a number of
variables, including real output growth and the market's expectation of long-term inflation and
expectations of the future monetary policy stance. For this reason there is not usually a close
relationship between long-term bond rates and the repo rate, although the yield curve may contain
useful information about the stance of monetary policy, and the market's expectations of future
inflation and real activity.
Interpreting the information contained in the yield curve or the yield spread is not always
straightforward. Standard theory tells us that the long-term nominal rate reflects the real rate and
inflation expectations. But neither of these components is observable, and there may be other
components as well such as liquidity premia which complicate the story. Also, the extent to which the
long-term rates react to central bank actions depend on the credibility of monetary policy. The
information content of the yield curve or yield spread is therefore not always clear-cut. I am sure you
all remember not too long ago Chairman Greenspan's long-term interest rate 'conundrum' in the
United States. Similarly, in South Africa, we were recently told that long-term interest rates were being
affected by liquidity considerations, as government's fiscal prudence had resulted in a shortage of
scrip in the market.
We would therefore not want to set policy on the basis of a single indicator, and we would look to other
indicators as well for corroboration. Inflation expectations are critical to monetary policy decisions.
Here we would rely on a number of indicators, including the long-term bond yields, the yield differential
between conventional and inflation-linked bonds, the Reuters consensus forecasts, and the inflation
expectations survey that we have commissioned the Bureau for Economic Research to conduct on our
behalf. All of these measures are imperfect, but they are indicative and, unless they contradict each
other, they could contain valuable information for policy purposes.
Although there are strong arguments for taking note of market signals, this does not solve all our
problems. No matter how well-informed markets are, or central bankers for that matter, they do not
have perfect foresight. As we know, the future is inherently unpredictable. Even if we make policy
optimally on the basis of all available information, new information becomes available all the time.
Behavioural relationships by their very nature are very difficult to predict. For example, we may expect
on the basis of our models that if real incomes rise, consumer expenditure will increase in proportion
to the estimated parameters. However, certain other unpredictable factors such as natural disasters,
or geopolitical influences to name a few, are not easily forecastable. As these events unfold and are
absorbed by the markets, current prices adjust, making previous forecasts redundant. This is the
nature of asset markets.
For this reason forward prices are changing all the time, which makes it difficult to easily use all the
market information with total confidence. It also explains why forecasts, including our own, are
periodically revised. Take the example of oil prices. As you know, oil prices are an important factor of
our inflation rate. The international oil price is an exogenous variable in our inflation forecasting model,
but the inflation forecast is critically dependent on our assumptions about the future path of oil prices.
We are not oil market experts, but we try to understand the supply and demand factors that impact on
the market.
We also look at the forecasts of a number of institutions, many of which would have specialised oil
price models and therefore presumably have a superior view of the oil price outlook. However, these
forecasts can vary significantly. According to the Reuters consensus survey, at the June meeting of
the MPC, the forecasts for Brent crude for 2006 ranged from US$56 to US$67 per barrel, and the
range for 2007 was US$46 to US$64. According to the latest Reuters consensus survey, the range for
2006 is now between US$63 and US$72 per barrel, and for 2007 the range is between US$53 and
US$75 per barrel. This indicates the enormous degree of uncertainty even among institutions that put
a lot of effort into forecasting the oil price. We can take advice from the market, but whose advice do
we take in this instance? The average or 'consensus' is not necessarily superior to any of these
individual forecasts.
Some central banks simply look at the oil futures prices, rather than trying to predict the impossible.
But as we all know, the futures curve shifts continuously as current prices change. All it tells us is what
today's price is, and what the implied price is over the next few months on the basis of a risk-free
interest rate and, storage costs. A sudden incident in Nigeria, Iraq or Iran, or a new tropical storm
system, for example, will suddenly change both the spot and futures prices.
Similar reasoning can be applied to forward rates in the currency and interest rate markets. These
change almost continuously as new information is absorbed by the market. The FRAs for example
change every time there is a change in the exchange rate, because of the expectation that this could
lead to a change in interest rates. As most studies show, even though forward rates, whether
currency, commodity or interest rates, are supposed to be unbiased predictors of future spot rates,
they are nevertheless not very good predictors.
This is the uncertain environment in which we as the central bank have to conduct monetary policy.
Clearly, we cannot change monetary policy on a daily basis. We have to take a forward-looking,
longer-term perspective on the basis of ever-changing data and events, news and surprises. While we
can rely on the market for some information, in the end we have to make the decisions on the basis of
our judgement. The collective view of the market helps us to make as informed a judgement as
possible.
3. Should the Bank follow the market in setting interest rates?
So far I have considered the issue of the flow of forward-looking data from the market to the Bank. As I
noted earlier, there is a strong case for the Bank to use such information as part of its data for policy
decisions. I do not think that this is particularly controversial. A related, but more complicated issue, is
the question of whether the Bank should follow the market when it comes to setting interest rates. In
other words, should monetary policy simply set interest rates on the basis of market expectations?
Today it is generally accepted that monetary policy should be sufficiently transparent so that the
market can discount changes in monetary policy in advance. If the market correctly anticipates
monetary policy actions, there will be little reaction to monetary policy announcements. One way of
achieving this favourable outcome is to simply follow market expectations.
However, if there is effective communication, market expectations of central bank actions will not be
independent of Bank actions and signals. Indeed, an important dimension of monetary policy is to
influence market expectations. Under such circumstances, interest rate expectations are not formed
independently of the view that the market has of central bank actions. In other words, if we signal a
change in the monetary policy stance, this will be reflected in current market rates ahead of the actual
change in the policy stance. Under such conditions, although it could appear that we are following the
market, we are in fact leading it.
Blinder, in his book "The Quiet Revolution', also warns against central banks becoming too respectful
of markets. He argues that slavishly following the market could lead to poor policy for a number of
reasons. Firstly, there is the problem of herd behaviour, which may or may not be rational, in
speculative financial markets. This results in overreactions to stimuli whereas monetary policy makers
need to proceed with caution and prudence. Secondly, speculative bubbles are a fact of life. As
Blinder graphically puts it, 'central bankers must steadfastly resist such whimsy and inoculate
themselves against the faddish behaviour that so often dominates markets. That may be why central
bankers are not much fun at parties'. Finally, he argues that market traders tend to have much shorter
time horizons than central bankers. This is even the case where long-term bonds are traded, but are in
fact treated as shorter-term instruments. The result is that by following the market, monetary policy
could land up having a short time horizon and be prone to overreaction. It is important for monetary
policy to maintain a focus on the medium term. We have to see through the short term noise and not
be blinded by it.
4. Communication from the Bank to the market
As I mentioned at the outset, increased transparency is a feature of modern central banking. Although
transparency is an essential part of the inflation targeting framework, it is not unique to this framework.
It is also the case that communication strategies of central banks differ widely, implying that there is no
single blueprint for central bank communication. In many cases, the nature of the communication is
determined by the institutional environment.
I think it is safe to say that the record of transparency at the South African Reserve Bank has improved
significantly with the introduction of inflation targeting. The adoption of inflation targeting in itself was
an important step towards increased transparency as it includes the announcement of a clearly
defined overriding monetary policy objective - that is, to maintain CPIX inflation within the target range
of 6 to 3 per cent. Other elements of improved transparency include the detailed monetary policy
statement released after each MPC meeting, the publication of the Monetary Policy Review, the
Monetary Policy Forums as well as the numerous speaking engagements undertaken by myself and
my colleagues. Of course transparency is a matter of degree, and there are some areas in which you
may feel we fall short, but this is an evolving process.
Transparency can also be taken too far and there are also some areas of what I would regard as
spurious transparency. Take for example our inflation forecast. In the Monetary Policy Review, we
publish the graph of our most recent inflation forecast with the assistance of the fan chart tool. In our
monetary policy statements we have taken to giving some idea of our inflation forecast at each
meeting. We do not however publish the exact numbers pertaining to each point, although we
generally indicate the peak and the end point. Some analysts have criticised the Bank for not
publishing every point along the trajectory. I would argue that this is a case of spurious transparency. It
will not make any difference to the policy decision if the outcome in three years time is 4,8 or 4,9 per
cent. What we focus on is the overall general trajectory and its relationship to the target range. In any
event, because of the inherently uncertain nature of the forecast, it is depicted in the form a fan chart
which illustrates the uncertainties.
There is a more substantive and difficult issue related to transparency. In publishing inflation forecasts,
the question arises as to how to communicate the path of interest rates on which the forecasts are
conditioned. Three different methods are used in practice, each with its own problems. We have
adopted an approach common to a number of central banks, of assuming an unchanged monetary
policy stance over the forecast period. In doing so, we are not committing ourselves in advance to a
particular interest rate path. At a simplistic level, this approach could tell us that if the forecast is above
the target, then the stance should be tightened and vice versa. It does not tell us how the forecast will
change if interest rates are changed, although different scenarios on different interest rate
assumptions can be run. It also does not tell us what the optimal interest rate path would be to keep
inflation within the target range over the forecast period. Thus, interest rates may not remain
unchanged over the forecast period if inflation is to be kept within the target range. Nevertheless this
approach does illustrate clearly the rationale for changing interest rates or leaving them unchanged.
An alternative approach, which has been adopted by a number of central banks, is to look at the
market forecasts of future interest rates. It has been pointed out by various analysts that this approach
contains a problem of circularity. As noted earlier, market rates are set to some extent on the basis of
what the central bank is expected to do, so there is nothing to pin down the system, leading to
indeterminacy of inflation.
The third option, favoured by a number of academics, is for the Bank to give its forecast of the future
path of interest rates. The central banks of New Zealand and Norway follow this route. The difficulty
here is that the public has to understand that these paths are not unconditional commitments, but that
they can change if the facts change. Unless this is fully understood, it can have an adverse impact on
monetary policy credibility. There are other practical problems with this approach. In particular, how do
you get a committee of eight people to agree on a path of interest rates over the next three years,
when it is sometimes exceedingly difficult enough reaching agreement on the current move! It should
be borne in mind that monetary policy in New Zealand is made by the Governor alone and not by
committee, which reduces some of the practical difficulties associated with this approach.
Even if a full path is not specified, there is also the question of whether or not the monetary policy
committee should signal future moves or policy bias. Here again practice varies from country to
country, as the ability to signal effectively between meetings is often determined by the nature of the
decision-making process in a country. Where the responsibility rests with a committee and
decisionmaking is by consensus, as is the case in South Africa, clear signals or commitments between
meetings becomes more of a communication challenge.
There have been times when we have been criticised for "surprising" the markets. It may well be that
in some instances the communication could have been clearer, but it is also the case that the market
does not always fully appreciate the conditionality of the signals. Let me give two examples.
At the June 2004 MPC meeting, interest rates were left unchanged, but we were concerned about the
risks to the inflation outlook. At the press conference following the meeting I warned that the 'party is
over'. This was widely quoted in the press and taken as a signal that we had reached the trough of the
interest rate cycle. At the next meeting, we lowered interest rates by 50 basis points, which led to
accusations that we had misled the markets.
There were a number of significant changes between the two meetings. These included the
improvement in inflation expectations and the appreciation of the rand which contributed to a lower
inflation forecast. Two lessons come out of this. Firstly, any signal that is given is not an unconditional
commitment. These commitments are conditional upon things remaining the same or changing in a
particular anticipated direction. Quite clearly, the conditions did not remain the same in this instance.
The second related lesson is that markets should not lose sight of the fundamentals. Instead of
focusing only on what the Bank says at a particular point in time, we should all keep track of how the
fundamentals are evolving. Policy should then be assessed on whether the move was justified on the
basis of the new information.
A more recent illustration was provided in April this year when we raised the repo rate by 50 basis
points, again taking some in the market by surprise. However, the tone of the statement issued at the
end of the previous meeting was intentionally 'hawkish', in order to signal a possible rate hike at the
next meeting. The markets recognised the hawkish nature of the statement and most of the analysts
picked up on this. Yet when the increase came at the following meeting, it took some in the market by
surprise. Perhaps we did not communicate clearly enough, but perhaps the market was also not
listening intently enough.
5. Recent economic developments
Before ending, I would like to highlight some recent economic developments. In the past few weeks
there have been a number of data releases which are of relevance to the Bank. Unfortunately most of
these releases have not contained much news, and these developments underline the risks to the
inflation outlook that we have been highlighting in the past few MPC meetings.
CPIX inflation for July was 4,9 per cent, slightly up from 4,8 per cent the previous month. The main
drivers were food and petrol prices. At these levels, we are still well within the inflation target range of
6 to 3 per cent. Of concern however is the broad-based rise in producer price inflation which measured
8,1 per cent in July, the highest year-on-year rate of increase since January 2003. Of particular
concern as well is the 18,3 per cent year-on-year increase in prices of agricultural goods.
Credit extension numbers show that consumers are still borrowing at a strong pace and there are no
clear indications that demand for credit are being affected by the recent changes to interest rates. We
are aware however that there is likely to be a lag before these effects are seen. Twelve-month growth
in bank loans and advances to the private sector accelerated from 23,3 per cent in June 2006 to 24,6
per cent in July. Mortgage advances were a major contributor to this.
Trade account data also indicate the continued underlying strength of domestic demand. South
Africa's trade deficit which had narrowed in June widened to R53,2 billion in July. In July, exports
increased month-on-month by 3,3 per cent while imports increased by 6,6 per cent.
It is not all bad news however. Growth in real gross domestic product increased at an annualised rate
of 4,9 per cent in the second quarter of this year, compared to a revised rate of 4,0 per cent in the first
quarter. Although real value added by the agricultural sector declined significantly, real value added by
the mining sector grew by 3 per cent, This followed three successive quarters of negative growth in
this sector. The manufacturing sector, which experienced annualised growth of 6,1 per cent show
signs of sustained resilience. The construction sector remains the strongest growing sector in the
economy.
6. Conclusion
Let me conclude by saying that communication between the Bank and the market goes both ways.
However, communication can only be effective if we listen to each other. The Bank recognises the
importance of effective communication and we will continue to try and improve on this. We should also
guard against excessive communication, however, as too much information could also result in
excessive noise or confusion. Transparency does not however mean that we will always be telling the
markets what our monetary policy decisions will be in advance of our meetings. The essence of
transparency is for us to react in a consistent manner in response to changes in the economy which
impact on our stated objective.
Thank you very much.