Group 1: CPI and PPI Analysis - In January 2026, the CPI increased by 0.2% year-on-year, a decrease of 0.6 percentage points from the previous month, primarily due to the timing of the Spring Festival[14] - The January PPI was -1.4%, showing a month-on-month increase of 0.5 percentage points, driven by rising international prices of non-ferrous metals[14] - Food prices in January fell by 0.7%, contributing approximately 0.11 percentage points to the CPI decline, with pork and egg prices dropping by 13.7% and 10.6% respectively[14] Group 2: CPI Weight Adjustments - The CPI underwent a five-year base period rotation starting January 2026, reflecting changes in consumer spending patterns[9] - The weight of "Food, Tobacco, and Alcohol" was adjusted to 29.5%, while "Clothing" was set at 5.4% and "Housing" at 22.1%[10] - The average impact of the base period rotation on the CPI year-on-year index is estimated to be around 0.06 percentage points[10] Group 3: Economic Implications - The GDP deflator has shown negative year-on-year growth for 11 consecutive quarters, indicating persistent deflationary pressures[21] - The central economic work conference emphasized the need to promote stable economic growth and reasonable price recovery as key monetary policy considerations[21] - Current macroeconomic policies are aimed at boosting domestic demand and facilitating price recovery through fiscal and monetary measures[23]

答： 基期轮换是价格指数编制的重要基础性工作，也是国际惯例和通行做法，旨在适应生产、流通、 消费领域商品和服务交易结构的新变化。基期是指价格指数对比基准时期，这一时期的指数为 100 。 按照统计制度安排，目前我国 CPI 和 PPI 每五年进行一次基期轮换， 2026 年开始编制和发布以 2025 年为基期的价格指数。下面以 CPI 基期轮换为例详细说明。 CPI 是综合反映一定时期内居民消费的商品和服务价格水平变动情况的相对数。由于居民消费的类别 和品种成千上万，为观察其总体价格变动情况，通常选取一定时期内居民经常消费、对居民生活影响较 大、有代表性的一组商品和服务作为"固定篮子"，用它们的价格变化来代表全社会所有商品和服务的 价格变化。随着经济社会发展，居民消费结构也在发生变化，需要及时调整 CPI 调查的"固定篮子"。 例如，随着我国居民越来越多地购买新能源小汽车，车用电力作为交通工具用能源需及时纳入 CPI 调 查范围。 CPI 基期轮换就是对"固定篮子"和价格对比基期进行调整，以适应居民消费结构的最新变 化，进一步提高价格指数的代表性，更加真实准确反映消费市场价格变动。 问：基期轮换对CPI和PP ...

Group 1 - The National Bureau of Statistics released the first data on the Consumer Price Index (CPI) and Producer Price Index (PPI) based on the 2025 benchmark, marking the first data release after the benchmark rotation [1] - The benchmark rotation involves adjustments to the survey classification directory, survey points (enterprises), representative specifications, classification weights, and price comparison benchmarks [1] Group 2 - The CPI benchmark rotation includes revisions to the survey classification directory, which now reflects new consumer trends by adding categories such as housing security equipment, elderly products, dishwashers, automotive electricity, photography services, internet medical services, and medical beauty services [2] - The category "Food, Tobacco, and Alcohol" has been renamed to "Food, Tobacco, Alcohol, and Dining Out," and "Tourism" has been renamed to "Travel Agency and Other Tourism Services" to better reflect changes in consumer spending [2] - A new travel service price index has been introduced, covering categories like airplane tickets, train tickets, accommodation, vehicle rentals, and travel agency services [2] Group 3 - Approximately 120,000 survey points and about 620,000 representative specifications were selected for the CPI survey, expanding the coverage compared to the previous benchmark [3] - New retail formats such as membership-based supermarkets and instant retail platforms have been included as survey points, along with representative specifications like smart drones [3] - The data collection methods for CPI have been optimized, with increased use of big data applications such as online transaction prices, enterprise electronic data, and administrative records [3] Group 4 - The CPI weight calculation follows principles of objectivity, authenticity, and scientific unity, using internationally comparable methods [3] - After the weight calculation, the new benchmark specifications' prices will be used to recalculate the index for 2025, serving as the new comparison benchmark [3]