Kansas City Fed Manufacturing Survey: Inventories of raw materials: Current (increase vs decrease; diffusion index; percentage points; seasonally adjusted) - United States - Kansas City Fed - Monthly
This series is part of the dataset: Kansas City Fed Manufacturing Survey
Download Full Dataset (.xlsx)Latest updates. According to recent survey data about manufacturing firms in the Tenth Federal Reserve District, the seasonally adjusted diffusion index for inventories of raw materials was 3.0 (share of CEOs seeing a recent increase minus share reporting a decrease) in March 2026, versus 6.0 in February 2026.
Sample. There are 297 data points in the monthly time series shown in the chart above. The series covers the period stretching from July 2001 to March 2026.
History. Check out a few statistics we calculated on the entire sample: the diffusion index recorded a maximum of 31.0 in October 2017; it recorded a minimum of -30.0 in May 2003; it had a mean value of 1.5.
Latest values
| Date | Value - Percentage points |
|---|---|
| 2026-01-31 | -4.0 |
| 2026-02-28 | 6.0 |
| 2026-03-31 | 3.0 |
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Series Metadata
| Field | Value |
|---|---|
| Description | Diffusion index for the question: Did inventories or raw materials increase or decrease in the past month? |
| Country | United States |
| Economic concept | Business survey response |
| Data type | Coincident indicator of the business cycle |
| Seasonally adjusted | Yes |
| Deflation method | Not applicable |
| Rescaling | None |
| Measure type | Diffusion index (share of respondents reporting an increase minus share reporting a decrease) |
| Frequency | Monthly |
| Unit | Percentage points |
| Source | Federal Reserve Bank of Kansas City |
| Source type | Central bank |
| Data licence | Reproduction allowed subject to conditions |
| Other information | FS correspondence: Inventories of raw materials |
| FSR temporal aggregation code | LM01 |
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