The US consumer price index increased by 0.4% in September, mainly due to a surge in rental costs. However, underlying inflation pressures remained moderate, leading to expectations that the Federal Reserve would not raise interest rates next month. The CPI has advanced 3.7% in the past year, down from a peak of 9.1% in June 2022. The core CPI, excluding food and energy, rose 0.3% and 4.1% year-on-year. Economists are waiting for more data to determine if the increase in rental costs is temporary or a significant market shift.