At the beginning of the year, a change was made to allow the Producer Price Index (PPI) to capture a wider range of items. PPI now focuses on the increase in prices of intermediate goods AND services used by companies to produce finished products. Services were not included before this year. One result of the change was to make the data more volatile month to month. Investors likely will look at longer-term trends in PPI, but they may not react much to monthly changes, as was seen today. To determine trends in inflation, investors rely more heavily on the Consumer Price Index (CPI), which measures price changes for finished goods, and the Core PCE price index, which is favored by the Fed.