Most major central banks have a clearly defined inflation target around 2% per year over the medium term. But why they don’t aim for 0%, so that prices remain unchanged over time? The answer lies in how inflation expectations influence economic decisions, the risks associated with deflation and the limitations of monetary policy.
An inflation target provides a clear reference point for households, businesses and financial markets. This matters because expectations influence behaviour. Businesses consider expected inflation when setting prices and negotiating wages. Workers take expected changes in the cost of living into account when negotiating salaries. Households factor expected inflation into decisions about consumption, saving and borrowing, while investors incorporate it into bond yields and other asset prices.
When the public trusts that a central bank will keep inflation close to its target, expectations are more likely to remain anchored around that level. This helps prevent temporary price shocks from turning into persistent inflation.
Take the increase in oil prices as an example. Higher energy costs can push headline inflation up temporarily. If households and businesses believe the central bank will bring inflation back towards 2%, they may be less inclined to demand permanently higher wages or raise prices aggressively in anticipation of further inflation. This makes the initial shock less likely to spread throughout the economy.
The opposite can happen when confidence in the inflation target deteriorates. If workers expect prices to keep rising, they may demand larger wage increases. Businesses facing higher labour costs may then raise their prices, reinforcing inflationary pressures. Central banks may have to raise interest rates more aggressively to break this cycle.
An inflation target acts as an anchor for expectations. It does not eliminate economic shocks, but it can help prevent those shocks from becoming self-reinforcing.
Why target 2% instead of 0%?
There are several reasons why a modestly positive inflation rate is preferable. The first is to create a buffer against deflation. Deflation occurs when the general price level falls persistently. Although falling prices might initially seem beneficial to consumers, widespread and sustained deflation can create serious economic problems.
When people expect prices to fall further, they may postpone purchases. Businesses can respond to weaker demand by reducing investment, cutting production and laying off workers. Lower incomes can then weaken demand further, putting additional downward pressure on prices and the economy.
Deflation also increases the real burden of debt. A household or business that borrowed money must still repay the same nominal amount, even if the prices of the goods and services it sells are falling. Revenues and wages may decline while debt repayments remain unchanged, making existing loans more difficult to service.
This can create a damaging feedback loop between falling prices, weaker demand, declining incomes and financial stress. A 2% inflation target provides a margin of safety. Inflation fluctuates around its target as the economy experiences changes in demand, supply disruptions and other shocks. If the target were 0%, a relatively small negative shock could push the economy into deflation immediately. With a positive target, central banks have more room to absorb these fluctuations without falling into deflation.
Inflation and real interest rates
Another reason central banks target positive inflation is that it helps preserve room to stimulate the economy by lowering real interest rates. What matters for economic activity is not just the nominal interest rate set by a central bank, but also how that rate compares with inflation. Real interest rates measure the cost of borrowing after accounting for the erosion of purchasing power caused by inflation. The real interest rate is approximately the nominal interest rate minus expected inflation.
When inflation exceeds the nominal interest rate, real interest rates are negative. This makes borrowing relatively cheap in real terms and reduces the real burden of existing nominal debt, supporting consumption, investment and credit growth. Conversely, when nominal interest rates exceed inflation, real rates are positive, making borrowing more expensive in real terms and encouraging saving over spending. This tends to restrain demand and slow economic activity.
Central banks therefore influence the economy partly by adjusting nominal rates relative to inflation expectations. When growth weakens, they can cut nominal rates to reduce real borrowing costs and provide stimulus. However, their ability to do so becomes more constrained when nominal rates are already close to zero.
This is where a positive inflation target becomes important. If inflation expectations are anchored around 2%, nominal interest rates can generally settle at a higher level over time than they would in an economy with a 0% inflation target, all else being equal. This gives central banks more room to cut nominal rates during a downturn, lowering real rates and making monetary conditions more accommodative.
A zero inflation target would leave less of a buffer against deflation. If inflation expectations fell below zero while nominal rates were already near zero, real interest rates could rise even without any increase in nominal rates. Monetary conditions would become more restrictive precisely when the economy might need additional support. This is what happened during the Great Depression as deflation drove real interest rates higher and made the economic downturn much worse.
A positive inflation target helps reduce this risk. It does not guarantee that real rates will always be low enough to stimulate growth, but it provides a buffer against deflation and gives central banks more flexibility to lower real borrowing costs when economic conditions deteriorate.
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This article was written by Giuseppe Dellamotta at investinglive.com.