The August consumer price index report, due Friday at 8:30 a.m., will be the final inflation data the Federal Reserve receives before deciding on interest rates at next Wednesday's meeting. Economists expect the report to show overall inflation at 3.4% annually and core inflation at 2.4%, with the data potentially determining whether the Fed holds rates or implements a rate hike. The stakes are exceptionally high as market expectations have grown volatile and depend heavily on incoming economic data and energy prices.