As of August 2025, the diffusion index (DI) of the Consumer Price Index (CPI) of all items in Japan stood at **** percentage points, indicating that the share of items with price increases was higher than the share of items with price reductions. The highest index percentage point since January 2021 was recorded in September 2023 at ****.
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Bank of Japan. (September 24, 2025). Monthly diffusion index (DI) of increasing and decreasing items in price based on Consumer Price Index (CPI) in Japan from January 2021 to August 2025 [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 25, 2026, from /statistics/1414634/japan-monthly-diffusion-index-consumer-price-index/
Bank of Japan. "Monthly diffusion index (DI) of increasing and decreasing items in price based on Consumer Price Index (CPI) in Japan from January 2021 to August 2025." Chart. September 24, 2025. ÌÇÐÄÆƽâ°æ. Accessed July 25, 2026. /statistics/1414634/japan-monthly-diffusion-index-consumer-price-index/
Bank of Japan. (2025). Monthly diffusion index (DI) of increasing and decreasing items in price based on Consumer Price Index (CPI) in Japan from January 2021 to August 2025. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 25, 2026. /statistics/1414634/japan-monthly-diffusion-index-consumer-price-index/
Bank of Japan. "Monthly Diffusion Index (Di) of Increasing and Decreasing Items in Price Based on Consumer Price Index (Cpi) in Japan from January 2021 to August 2025." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 24 Sep 2025, /statistics/1414634/japan-monthly-diffusion-index-consumer-price-index/
Bank of Japan, Monthly diffusion index (DI) of increasing and decreasing items in price based on Consumer Price Index (CPI) in Japan from January 2021 to August 2025 ÌÇÐÄÆƽâ°æ, /statistics/1414634/japan-monthly-diffusion-index-consumer-price-index/ (last visited July 25, 2026)
Monthly diffusion index (DI) of increasing and decreasing items in price based on Consumer Price Index (CPI) in Japan from January 2021 to August 2025 [Graph], Bank of Japan, September 24, 2025. [Online]. Available: /statistics/1414634/japan-monthly-diffusion-index-consumer-price-index/
