As the release of the U.S. Consumer Price Index for August approaches, markets are closely monitoring the latest inflation dynamics. Economists expect overall prices to be significantly driven up by energy and food costs, with headline CPI potentially rising 0.4% month-on-month. However, core inflation, which strips out volatile components, is expected to remain relatively subdued, with a month-on-month increase of around 0.2%, with more precise estimates placing it slightly below this mark at approximately 0.19%. This divergence between headline and core inflation is primarily due to gasoline prices shifting from a drag of nearly 12 basis points last month to a boost of about 2.5 basis points this month, coupled with stabilizing and recovering food-at-home prices and resilient dining-out costs.

Despite the long-term slowdown in price growth, the Federal Reserve is not entirely satisfied with the current pace of inflation moderation. Senior Fed officials recently noted that while summer inflation data has improved, the underlying inflation trend has not shown substantial progress. Research also indicates that current price pressures are largely driven by non-cyclical exogenous factors, such as the lagged effects of tariffs and energy costs. Against this backdrop, market expectations regarding the Fed's policy reaction function are undergoing subtle shifts. Policymakers are increasingly of the view that the phase of attributing excess inflation solely to external factors is over, and the trajectory of monetary policy will be more closely anchored to actual data improvements.

This shift in policy thinking has directly influenced market positioning ahead of the September FOMC meeting. Key figures within the Fed have clearly signaled a willingness to allow a window of time for inflation to moderate, provided subsequent data is sufficiently favorable. For the upcoming August core CPI, whether the month-on-month reading can be effectively kept below the critical threshold of 0.2% will be the key determinant of the Fed's next move. If core inflation fails to meet this stringent condition, policymakers' patience for holding rates steady will wear thin, and the probability of resuming rate hikes next week will surge. In the eyes of policymakers, even just one or two modest rate increases would be enough to substantively curb further upward price pressures.