广发宏观：11月美国通胀降温：可能存在停摆扰动下的失真

Group 1: Inflation Data Impact - The release of the November CPI report in the U.S. has been delayed from December 10 to December 18 due to the government shutdown, affecting data collection from October 1 to November 12[3] - The absence of October data complicates trend analysis, as the BLS confirmed that key CPI components relying on manual collection were not gathered during the shutdown[4] - The report's quality is questioned due to a reduced sample size, with data collection expected to be around 75% of normal levels, leading to increased volatility and statistical errors[4] Group 2: Methodological Concerns - The CPI calculation will use a carry-forward methodology, assuming zero price changes for items not sampled in October, which may lead to a technical downward bias in the data[5] - The rental data, which has the largest weight in CPI, may only reflect half of the normal increase due to the lack of October data, potentially causing a rebound in April when the data is resampled[8] - The sampling period coincided with holiday promotions, likely leading to an underestimation of prices, particularly for goods[11] Group 3: CPI Results - The CPI year-over-year increased by 2.7% in November, lower than the previous 3.0% and below the expected 3.1%[8] - Core CPI year-over-year rose by 2.6%, also below expectations and the previous value of 3.0%[8] - Core goods inflation showed a significant slowdown, with an average month-over-month increase of only 0.03%, far below the market expectation of 0.3%[9]