A monthly synthetic indicator compiled by the Bank of Japan that tracks private consumption by combining supply- and demand-side statistics into a single index benchmarked to GDP consumption data. It provides a timely read on Japanese household spending ahead of the lagged quarterly national accounts.
How it works
The CAI aggregates sales and output statistics across goods and services, weights them to match the consumption component of GDP, and is periodically rebased and re-estimated when the national accounts shift base year. A "real" version deflates the nominal series, and a travel-balance-adjusted variant nets out inbound/outbound tourism spending.
Why it matters now
With the BOJ normalising policy out of negative rates and watching for durable demand-pull inflation, the CAI is a key high-frequency gauge of whether Japanese household spending is sustaining the wage-price cycle. The 2020-base GDP revision required re-estimating the index, affecting recent consumption signals feeding rate-path expectations.
Example
In 2024-2025 the Bank of Japan revised the CAI's estimation methods after Japan's national accounts moved to a 2020 base year (from 2015), re-anchoring the index's weights and deflators to the updated GDP consumption series and altering the historical level and momentum of the published consumption track.
Frequently asked
- What is the Consumption Activity Index?
- The Consumption Activity Index (CAI) is a monthly synthetic indicator compiled by the Bank of Japan that tracks private consumption by blending supply- and demand-side statistics into one series benchmarked to GDP consumption data. It gives macro analysts a timely read on Japanese household spending weeks ahead of the lagged quarterly national accounts.
- How does the CAI differ from Japan's GDP consumption figures?
- The CAI is monthly and timely, while GDP consumption is quarterly and lagged. The CAI synthesises sales and output statistics weighted to match GDP's consumption component, acting as a high-frequency proxy. Because it is benchmarked to the national accounts, it gets re-estimated and rebased whenever GDP shifts base year, as it did with Japan's 2020-base revision.
- Why does the Consumption Activity Index matter for BOJ policy now?
- The CAI matters because the Bank of Japan is normalising policy out of negative rates and watching for durable demand-pull inflation. It is a leading gauge of whether household spending is sustaining the wage-price cycle the BOJ needs to confirm before raising rates. Soft CAI readings argue for caution; firm consumption supports continued tightening.
- What is the travel-balance-adjusted CAI?
- The travel-balance-adjusted CAI is a variant that nets out inbound and outbound tourism spending. Standard consumption statistics capture foreign visitors' spending in Japan and exclude Japanese residents' spending abroad inconsistently; the adjusted series isolates domestic resident demand. This distinction matters given Japan's post-2022 inbound tourism boom, which can inflate headline consumption readings.
- How does the CAI compare to US PCE?
- The CAI is the BOJ's high-frequency proxy for Japanese consumption, analogous in spirit to US PCE but constructed differently. PCE is a national-accounts component published monthly by the BEA with its own price index; the CAI is a synthetic index built from disparate sales and output statistics to anticipate Japan's quarterly GDP consumption ahead of release.