Kansas City Fed Manufacturing Survey: Inventories of raw materials: Current (increase vs decrease; diffusion index; percentage points; seasonally unadjusted) - 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 unadjusted diffusion index for inventories of raw materials was 8.0 (share of CEOs seeing a recent increase minus share reporting a decrease) in September 2026, compared to 9.0 in August.
Sample. There are 303 records in the monthly time series presented in the chart above. The series covers the span of time stretching from July 2001 to September 2026.
History. Check out a few summary statistics we computed on the full sample: the diffusion index had an average value of 1.6; it recorded its highest level of 34.0 in March 2022; it hit a trough of -30.0 in December 2001.
Latest values
| Date | Value - Percentage points |
|---|---|
| 2026-07-31 | 4.00000 |
| 2026-08-31 | 9.00000 |
| 2026-09-30 | 8.00000 |
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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 | No |
| 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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