Private household spending accounts for about half of Japan’s gross domestic product, making it one of the most influential components of overall economic growth. Because consumer behavior tends to shift quickly as conditions change, economists and policymakers place a premium on indicators that can track private consumption accurately and with minimal delay. To support business-cycle analysis and broader macroeconomic assessment, the Bank of Japan’s Research and Statistics Department regularly publishes a set of research statistics known as the Consumption Activity Index (CAI).
The CAI is designed to capture short-term movements in consumption activity and is published in both monthly and quarterly frequency. Rather than relying on a single survey or dataset, the Bank compiles the index from a range of underlying statistics that reflect sales and supply conditions across goods and services. This approach aims to provide a timely read on how much households are spending and how that spending pattern is evolving.
To accommodate different analytical purposes, the Bank offers several versions of the CAI. Users can access nominal and real series, allowing comparisons either in current prices or after adjusting for price changes. The dataset also includes indexes that either incorporate or exclude adjustments related to the travel balance, supporting analysis that may want to isolate domestic consumption trends from fluctuations associated with travel-related spending. In addition, the CAI is available with a breakdown by type of goods and services, enabling more granular study of which categories are driving changes in overall consumption.
Release timing is also structured to support near-term monitoring. As a general rule, the Bank publishes the data at 2:00 p.m. on the fifth business day of each month, although it notes that this schedule can change. For users who need to understand how the CAI is built—such as researchers conducting replication or deeper methodological review—the Bank points to detailed explanations in associated research papers describing the compilation methods.
The Bank positions the charts and datasets as part of its broader research and analytical toolkit, intended for use by a wide community of stakeholders interested in economic and financial developments. At the same time, it emphasizes that the published materials may be subject to revisions, unscheduled modifications, or discontinuation, reflecting the realities of statistical updates and evolving data inputs.
For those seeking to reproduce or copy the charts and data for commercial purposes, the Bank requests that users contact the Research and Statistics Department to obtain permission. When quoting or reusing the material, the Bank also asks that users clearly cite the Bank of Japan as the source. The work is provided by the Economic Assessment and Projection Group within the Economic Research Division of the Research and Statistics Department.
Why it matters
With private consumption representing roughly half of GDP, small shifts in household spending can meaningfully alter Japan’s growth outlook. A frequent, methodologically documented indicator like the CAI gives businesses, investors, and policymakers a faster signal on demand conditions than many traditional measures. Watch for revisions and schedule changes, and for how category-level breakdowns and travel-balance adjustments may influence interpretations of the underlying trend.