Making Sense of Inflation Measures: Comprehensive Economies Study Notes
Overview and Definition of Inflation
General Definition: Inflation is defined as the percentage change in the overall prices within an economy over a specific duration, which is typically measured a year-over-year basis.
Conceptual Distinction: Inflation represents a broad rise in the aggregate price level across the economy; it is not merely an increase in the prices of a few isolated products.
Economic Significance: In 2022, inflation in the United States reached its highest level in 40 years, marking the first encounter with significant high inflation for the majority of the American population.
Methodological Difficulty: Measuring inflation is cited as one of the most complex and difficult issues researched by economists because it is impossible to track every single price in the country simultaneously.
Price Indices: To address the difficulty of tracking all prices, economists utilize a price index to approximate the general price level of the economy.
The Consumer Price Index (CPI): The Traditional Measure
Calculation and Authority: The Headline Consumer Price Index (CPI) is calculated and maintained by the Bureau of Labor Statistics (BLS).
Historical Context: The original version of the CPI was established in 1919. It was created by policymakers seeking a more accurate method to measure the rising cost of consumer prices following World War I.
Scope and Target Population: The index measures price fluctuations for a specific "basket" of goods and services that are purchased by a typical urban consumer.
July 2022 Data: In July 2022, the CPI rose by from the previous year.
Weighting System: Items within the CPI basket are weighted according to their relative importance in overall consumer expenditures.
Housing: This category, which includes rent and other spending related to shelter, accounts for approximately of the CPI index.
Medical Care: This category accounts for nearly of the index.
Dynamic Adjustments: The CPI must account for changing consumption patterns, meaning new products are added to the basket while obsolete ones are removed.
Current Update Frequency: As of 2022, CPI weights are adjusted every two years (biennially) using two prior years of consumer spending data.
Future Update Frequency: Beginning in 2023, the BLS will move to an annual update frequency, utilizing one year of spending data.
The Personal Consumption Expenditures (PCE) Price Index: The FOMC Choice
Policy Shift: Prior to the year 2000, the Federal Open Market Committee (FOMC) primarily monitored the CPI. However, during the 1990s, the Federal Reserve evaluated alternative measures and switched its preference to the Headline Personal Consumption Expenditures (PCE) price index.
July 2022 Data: In July 2022, the PCE price index rose by from the previous year.
Advantages and Scope: The PCE is derived from a significantly broader index of prices compared to the narrower set used in the CPI.
Comprehensive Nature: A primary argument for the PCE is that a more comprehensive index provides a superior gauge for underlying inflationary pressures.
Structural Comparisons with CPI:
Weighting Differences: Because the PCE includes more categories, the weights for specific items differ from the CPI. For example, housing carries a weight of only about in the PCE, compared to in the CPI.
Reporting Frequency: PCE weights are updated on a monthly basis, whereas the current CPI is updated biennially.
Responsiveness to Change: The monthly updates of the PCE allow it to quickly capture the impacts of new technology or sudden shifts in consumer behavior.
Pandemic Example: At the start of the COVID-19 pandemic, consumption patterns shifted abruptly from services (such as restaurants) to goods (such as electronics). The PCE is designed to reflect these shifts faster than the CPI.
FOMC Inflation Targets and Policy Framework
The 2% Target: The FOMC specifically targets the headline PCE inflation rate at a level of .
Policy Rationale: Federal Reserve policymakers judge that a inflation rate is consistent with attaining long-term price stability and maximum employment.
Historical Trends: From 1995 through 2019, the average headline PCE inflation rate was approximately , slightly below the official target.
2020 Policy Framework: In 2020, the FOMC adopted a new strategy designed to ensure that inflation averages over time, rather than treating it as a rigid ceiling.
Current Priority: Bringing the 2022 inflation rate back down to the target is explicitly stated as the top priority for the FOMC.
Alternative and Statistical Inflation Measures
Volatility Issues: "Headline" measures can be highly volatile because they are influenced by extreme price fluctuations in certain specific products.
Core Inflation Measures: The "core" indices (Core PCE or Core CPI) exclude the food and energy components of the price basket.
Critique of Core Indices: Some economists, including the author of the text (reference to "The Core Is Rotten," 2011), argue that core measures are unsatisfactory. Identifying underlying inflation by throwing out items that hit low-to-moderate-income consumers the hardest is problematic.
Spillover Effects: Even if food and energy are excluded, their volatility often affects the remaining index. For instance, restaurant prices (a core item) are directly influenced by the cost of food/energy.
Dallas Fed Trimmed-Mean PCE: This statistical measure examines the price change distribution for the entire range of goods and services.
Methodology: It removes the "upper tail" (the largest price increases) and the "lower tail" (the smallest price changes/decreases) and calculates the weighted average of the remaining middle components.
Utility: It is used to identify long-term trends and overall inflation by filtering out special factors or outliers.
Persistence: Statistical measures like the trimmed-mean tend to move more slowly and be more persistent than headline inflation measures.
Additional Specific Measures:
Cleveland Fed: Produces the Median CPI and the Trimmed-mean CPI.
Atlanta Fed: Produces the "Sticky-Price CPI."
Questions & Discussion
Question regarding COVID-19 impact: How did the pandemic affect inflation measurement?
Response: Research by Assistant Vice President Michael McCracken and Aaron Amburgey (February 2021) highlighted that COVID-19 caused a sudden shift in consumer habits from services to goods, making fixed-basket measures like the CPI potentially less accurate during the shift compared to the monthly-adjusting PCE.
Question regarding the pervasiveness of price increases: How widespread have these increases been?
Response: Fernando Martin (October 2021) explored the distribution of price changes to determine if inflation was driven by a few sectors or was a broad-based phenomenon.
Question regarding the reliability of "Core" inflation: Is focusing on core inflation effective?
Response: The text notes that while common, excluding food and energy can be misleading as these costs are essential to many consumers and eventually bleed into other sectors, such as transportation or restaurant operations.