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As oil prices have climbed over the last several years, the memory of the 1970s and early 1980s has not been far from the minds of the public or of monetary policymakers. In those earlier episodes, rising oil prices were accompanied by double-digit overall inflation in the U.S. and in several other developed economies. Indeed, central bankers say they are determined not to let this experience recur, emphasizing that they intend to maintain their credibility with the public in securing low inflation and achieving stable and well-anchored inflation expectations. In pursuing these goals, a key measure policymakers often focus on is core inflation; this may seem surprising, since core inflation excludes energy prices, among other things. However, one justification for looking at a measure that excludes energy prices is that they are typically quite volatile; for example, after rising steadily and hitting a record of about $145 per barrel in July, oil prices then fell to under $100 per barrel in September. Temporary oil price increases do not tend to pass through to the prices of non-energy goods and services when the central bank is crediblethat is, when inflation expectations are well-anchoredand, therefore, will not result in persistently higher overall inflation.
This Economic Letter examines the impact of rising oil prices on core inflation over the last decade for four economies: the U.S., the euro area, Canada, and the U.K. I find some evidence that rising oil prices have had a positive and significant effect on core inflation in the euro area, but I find no systematic evidence that rising oil prices have had a significant impact on core inflation in the U.S., Canada, or in the U.K.
How do rising oil prices affect the inflation rate?
Rising oil prices tend to affect the overall consumer price index (CPI) directly by raising its energy cost component, which includes the prices of energy-related items, such as household fuels, motor fuels, gas, and electricity. Among these, gasoline and fuel oil are directly derived from crude oil, so their prices follow oil prices very closely. An increase in the price of oil may also affect energy costs through the prices of other items that are close substitutes; for example, households and businesses may switch from oil-related energy items to natural gas, thus leading to an increase in its price. The extent to which rising oil prices translate into higher overall inflation through higher energy costs depends on their persistence. If they continue to rise, they may lead to sustained increases in the overall price level, that is, to an increase in the overall inflation rate.
Rising oil prices tend also to affect the core portion of the CPI indirectly, because energy prices represent a considerable portion of the production cost for many of the items in it, such as transportation services. In addition, if workers have to pay higher energy prices themselves, they may bargain for compensating wage increases, which also increases the production costs of items in the core CPI. The extent to which rising oil prices translate into higher core inflation through higher production costs depends, among other things, on how much they break into the overall inflation expectations of those who set prices and wages. In fact, if rising oil prices lead to higher inflation expectations over the longer term, rising energy and wage costs are more likely to be passed through in terms of rising consumer prices. In this case, rising oil prices may lead to sustained increases in the core portion of the CPI, that is, to an increase in core inflation.
However, once oil prices stabilize, as they have in recent months, the corresponding inflationary pressures will dissipate. As a result, both overall and core measures of inflation may decline, with the overall inflation rate likely to fall towards the lower rate of core inflation.
In their efforts to secure a low and stable inflation environment, and therefore limit the impact of inflationary pressures emanating from rising oil prices, monetary policymakers pay close attention to core inflation for several reasons. One is that the exclusion of the volatile food and energy components makes it a more reliable indicator of the underlying trend in inflation. Fluctuations in the prices of food and energy may reflect exogenous shocks, that is, developments that are not inherent to the dynamics of the economyfor example, a drought may