Banks must find balance between continuing to support activity without sowing seeds of another asset bubble
The decade and a half after the tearing down of the Berlin Wall was a
 golden age for central banks. It was a time of strong growth and low 
inflation presided over by committees of technocrats charged with taking
 the politics out of the messy business of setting interest rates.
The 
European Central Bank (ECB) was created, the Bank of England was granted operational independence and Alan Greenspan ruled the US 
Federal Reserve.
Mervyn
 King, who retired last year after a 10-year stint in charge at 
Threadneedle Street, described the period from the mid-1990s to the 
mid-2000s as the Nice decade. That stood for non-inflationary continual 
expansion and in the west was primarily the result of cheap imports 
flooding in from China, which kept the cost of living low and enabled 
central bankers to hit their inflation targets while keeping borrowing 
costs down.
Times have changed. The six and a half years since the
 financial markets froze in August 2007 have been anything but nice. 
Greenspan is no longer called the Maestro – the title of a hagiography 
by Bob Woodward before the sky fell in – and is instead vilified as a 
serial bubble blower.
Central banks found that their traditional 
policy instruments were ineffective as the banks tottered in the autumn 
of 2008. They resorted to more potent weapons: dramatic cuts in interest
 rates, the creation of money through the process known as quantitative 
easing; inducements to persuade banks to lend; forward guidance on the 
expected path of interest rates to reassure individuals and companies 
that the cost of borrowing would stay low.
There was no 1930s-style slump and the 
global economy
 bottomed out around six months after the collapse of Lehman Brothers in
 September 2008. But recovery was slow by historical standards and the 
global economy has displayed signs of being addicted to the stimulants 
provided by central banks.
All of them will be under scrutiny in 
2014 as the world's central bankers seek a way of getting the balance 
right in continuing to support activity without sowing the seeds of 
another asset bubble.
Get it right and the reputation of the Fed, 
the ECB, the Bank of England, the Bank of Japan (BoJ) and the People's 
Bank of China (PBoC) will be burnished. Get it wrong and the history 
books will look back on the crisis and its aftermath as the years when 
central banks lost the plot and saw their credibility shattered.
The Federal Reserve (US)
The Fed made its intentions clear last month when it announced it was
 scaling back its quantitative easing programme from $85bn a month to 
$75bn, with further tapering due to take place during 2014. At the same 
time, the US central bank softened its stance on interest rates and said
 unemployment will have to fall to 6.5% – and probably lower – before 
the cost of borrowing is raised.
The low level of inflation means that 
policy can remain stimulative under its new chairman, Janet Yellen, but 
with growth strengthening, the Fed has to beware repeating Greenspan's 
mistake in the early 2000s when he left rates too low for too long.
Dhaval
 Joshi of research house BCA said: "From January the Fed is going to 
reduce the pace of its asset purchases and shift the policy onus to its 
forward guidance on interest rates, relying on the credibility of its 
words and promises. As we are in uncharted territory, the eventual 
market reaction is unclear, and there is certainly the possibility of 
disruption."
The European Central Bank (ECB)
After a quiet 2013, the ECB has a number of big calls to make in the 
coming year. Not only is the recovery from a long double-dip recession 
tepid but the euro area as a whole is perilously close to deflation. 
Greece and Cyprus are already seeing the annual cost of living fall. So 
the first question for ECB president Mario Draghi is whether to seek to 
stimulate the euro area economy through quantitative easing – QE – just 
at the moment the Fed is tapering away its programme.
A second, 
linked issue is the strength of the euro, which threatens to choke off 
exports. David Owen of Jefferies says the ECB has two possible policy 
options: QE or co-ordinated intervention to weaken the currency. Markets
 will also pay close attention to the ECB's asset quality review of 
European banks, when it has to decide whether to come clean about the 
capital shortfalls many are believed to face.
If Draghi is too 
opaque he will be accused of a cover-up; equally, he will get the blame 
if a fully transparent approach leads to a run on banks and – because 
they are large holders of euro-area government debt – drives up 
sovereign bond yields.
The People's Bank of China(PBoC)
The challenge for the PBoC is simple: remove the credit excesses of 
the world's second biggest economy without causing a hard landing. 
November's third plenum of the Communist party in Beijing set the 
Chinese economy on a liberalisation course, a move welcomed by most 
analysts in the west as likely to ensure the long-term sustainability of
 growth.
In the short term, though, there is the little matter of 
easing growth back from the 10% per annum of recent years to 6.5% to 7%.
 On the plus side, China still has a battery of credit controls that 
will provide protection against mass capital flight if things start to 
get sticky; on the debit side, the vast quantity of credit pumped into 
the economy in 2008–09 has led to an overheated commercial property 
market, heavily indebted local government and industrial overcapacity.
An
 indication of the challenge facing the PBoC was provided by the spike 
in interbank rates to almost 10% last month – raising fears that a 
tightening of policy is causing a credit crunch for the banks.
The Bank of Japan (BoJ)
Japan is a warning to the ECB of what can happen if deflation is 
allowed to set in. Just over a year ago, Japan's prime minister, Shinzo 
Abe, announced a "three-arrow" strategy that became known as Abenomics: 
radical monetary easing from the BoJ, a Keynesian programme of public 
works, and structural reform.
In the early stages of the programme, the 
BoJ is doing the heavy lifting, using negative interest rates and 
quantitative easing to drive down the value of the yen, raise import 
prices and push inflation up towards its official target of 2%.
Japan
 is especially vulnerable to a slowdown in the global economy which, on 
past form, would attract speculative money into the yen, drive down 
prices and force the BoJ into even more unconventional measures.
The Bank of England (BoE)
Mark Carney's big innovation at Threadneedle Street has been forward 
guidance, which he used when governor of the Bank of Canada. This 
involves a commitment not to consider raising interest rates until 
unemployment falls to 7%, unless there is the risk either of inflation 
getting out of control or of a housing bubble that can't be tackled 
using measures specifically targeted on the property market. But the 
Bank has underestimated both the speed of the fall in the jobless rate 
and the pickup in the mortgage market. Carney's fear is that premature 
tightening of policy will kill off recovery in its early stages, but 
markets are starting to question whether he can hold the line until the 
next general election in May 2015.
Contributed by Larry Elliott The Guardian