Group 1 - The consumer price index (CPI) increased by 0.1% month-on-month in September, while year-on-year it decreased by 0.3%, with the core CPI (excluding food and energy) rising by 1.0%, marking the fifth consecutive month of growth [1][2] - Food prices rose by 0.7% month-on-month, contributing approximately 0.13 percentage points to the CPI increase, while clothing prices increased by 0.8% due to seasonal changes [1] - The producer price index (PPI) remained flat month-on-month and decreased by 2.3% year-on-year, with the decline narrowing by 0.6 percentage points compared to the previous month [2][3] Group 2 - The year-on-year decline in CPI of 0.3% was primarily influenced by a negative carryover effect of approximately 0.8 percentage points, while new price changes contributed about 0.5 percentage points [2] - The PPI's month-on-month stability is attributed to improved supply-demand dynamics in certain industries, with coal processing prices rising by 3.8% and coal mining prices increasing by 2.5% [2][3] - The narrowing year-on-year decline in PPI is a result of ongoing macroeconomic policy effects, with some industries experiencing positive price changes due to market competition and structural upgrades [3]