Friday's CPI Report May Spark Interest Rate Hike and Market Volatility

The upcoming release of August's Consumer Price Index (CPI) data on Friday could have significant implications for interest rates and the stock market. According to Fed Governor Christopher Waller, the next interest rate decision may hinge on this report.

The CPI measures U.S. inflation by tracking changes in the aggregate price of a basket of goods and services over time. In July, the CPI increased by 3.4% year over year, significantly above the Federal Reserve's target rate of 2%. If the August numbers are higher than expected, it could lead to an interest rate hike.

Rising oil prices have been a major contributor to inflation, with energy costs surging by 14.7% year over year in July. The Producer Price Index (PPI), which tracks input costs for businesses, also jumped by 4.7% in July. Given the recent increase in oil prices since the PPI report was released, it's likely that energy placed even more upward pressure on inflation in August.

The FedWatch tool from the CME Group suggests a 50% chance of an interest rate hike at the September meeting. A rate hike would typically be bad news for stocks, as higher borrowing costs reduce consumer spending and business investment.