US wholesale inventories rose 0.5% in August, missing 0.7% forecast

• The previous month's increase was 1.3%
• Wholesale sales climbed 1.8%, compared with a prior 0.8% rise

Data on US wholesale inventories tracks the dollar value of goods merchant wholesalers hold for resale, offering a view of stockpiling activity between producers and retailers or other business clients. Released each month by the Census Bureau, the wholesale trade report also covers sales and the ratio of inventories to sales. A preliminary estimate of inventories is published earlier, giving economists an early figure for use in GDP projections.

The main number is the month-over-month percentage change in seasonally adjusted inventories. An increase does not necessarily signal a positive development: firms might be building stock in anticipation of stronger demand, or they may be stuck with unwanted goods because sales fell short. Declining inventories could reflect robust demand that outstrips supply, or intentional reductions as companies turn cautious.

That is why wholesale sales and the inventories-to-sales ratio provide necessary context. The ratio indicates how many months of sales the current inventory level can support. When the ratio rises, it may suggest goods are moving more slowly, which could lead to discounts and smaller orders. A falling ratio may point to leaner inventories and a need to restock.

Inventories also play a role in GDP, though the calculation is often misunderstood. The contribution to economic growth hinges on whether inflation-adjusted inventory accumulation sped up or slowed down. Consequently, stocks can go up even while inventories subtract from GDP growth if the buildup is less than it was in the prior quarter.

Another point to note is that the headline Census figures are reported in dollar terms and are not adjusted for price changes. Higher commodity prices can push up reported inventories without a comparable rise in physical stock.

For market participants, the release tends to matter most when revisions alter GDP forecasts or the sales data reveal an unexpected shift in underlying demand.