The concept of “core” inflation, that is, a measure of inflation excluding food and energy prices, came into fashion in 1973. In 1972, there was an El Nino weather phenomenon, which decimated the sardine school off the coast of Peru. Sardines were ground into fishmeal, which, in turn, was used as animal feed. The dearth of sardines resulted in an increase in the price of land-animal protein in 1973. Energy prices soared in late 1973 as a result of the OPEC oil embargo in the aftermath of the Yom Kippur War between Israel and its neighbors. (It has been argued that the catalyst for the OPEC oil embargo was the decline in the foreign-exchange value of the US dollar. OPEC nations were being paid in US dollars, which reduced their purchasing power for goods and services sold in other currencies). The chairman of the Federal Reserve at that time was the venerable Arthur Burns – he who must be obeyed. Burns argued that the increases in food and energy prices being experienced in 1973 were not the result of the current stance of monetary policy, but were caused by exogenous factors. Therefore, according to Burns, monetary policy decisions should be based on some concept of the underlying rate of inflation, not price increases resulting from exogenous factors.
Let’s fast forward to today. Energy prices have shot up in the past week or so coinciding with the US and Israel shooting up Iran. Less reported, El Nino is once again plaguing Peru. I have not read that El Nino has adversely affected the sardines, but it is producing severe flooding in Peru, which is playing havoc with Peruvian agriculture. I bet you didn’t know that Peru is a major world exporter of blueberries, grapes, avocados, coffee and asparagus. Neither did I until I started writing this commentary. We do not know how long this military “excursion” into Iran will last and, therefore, how long the resulting increase in energy prices will last and/or how high they will go. But I suspect that we will hear Fed policymakers and financial media talking heads say that Fed policy should be guided by the current and expected behavior of core inflation. That is, the inflation rate excluding the prices of food and energy items because the current increases in food and energy items have not been caused by monetary policy and might be transitory. I’ll bet that at least one Fed policymaker whose term has been extended (and whose initials are SM) will argue that monetary policy should be eased because of the negative effects these food and energy price increases will have on real economic growth.
Let’s look at what happened to core inflation in the early 1970s when food and energy prices flared higher (see Chart 1). In 1972:Q4, year-over-year core Personal Consumption Expenditures (PCE) inflation was 3.05%, food inflation 5.14% and energy inflation was 3.10%. By 1974:Q4, year-over-year core PCE inflation was 9.84%, food inflation was 14.10% and energy inflation was 25.80%. So, during this period, not only did food and energy price inflation soar, so, too, did core inflation.