WASHINGTON, D.C. — The Ludwig Institute for Shared Economic Prosperity (LISEP) today announced refinements to the methodology of its True Living Cost Index (TLC), a metric designed to better assess the impact of inflation on low- and middle-income (LMI) families, and a correction to the 2022 data.
The TLC tracks price changes for essential goods and services LMI families need to maintain a basic standard of living. Unlike the Consumer Price Index (CPI), which tracks price changes on a diverse basket of more than 80,000 items, the TLC focuses on eight core categories that make up a majority of most LMI household budgets: housing, food, healthcare, childcare, transportation, basic technology, and miscellaneous personal care and household items.
From 2001 to 2022, LISEP found that the cost of these essentials rose nearly 1.3 times faster than the CPI — 83.8%, compared to the CPI’s 65.3%. This update to the TLC methodology ensures it continues to accurately reflect the changing financial realities faced by LMI families.
Through collaboration with experts in the field, LISEP refined the TLC methodology in several key areas:
More Precise Rent Data: The TLC now incorporates the effective date window (applicable starting in October of the previous year) for Fair Market Rents (FMRs), providing a more precise picture of LMI rental costs.
Improved Housing Cost Representation: The process for aggregating housing costs has been improved to better represent the housing needs of LMI households.
Consistent Aggregation: The aggregation of cost-of-living changes from local to national levels is now more consistent across different geographic areas and household types.
In addition, LISEP addressed a technical error in the 2022 TLC calculation. Originally reported as a 7.8% year-over-year increase, the revised change in the TLC from 2021 to 2022 is 6.3%. This was a one-year anomaly that had no impact on data reported for previous years.
“LISEP is committed to providing the most accurate and reliable data possible,” said LISEP
Chairman Gene Ludwig. “We view this update as an ongoing process of improvement and are confident that the refined methodology strengthens the TLC as a valuable tool for understanding the economic realities of LMI families.”
The updated TLC white paper, reflecting the revised methodology and corrected data, and full TLC report are available on the LISEP website at www.lisep.org/tlc.