The rebasing of the consumer price index (CPI), which is conducted every five years, took place last month, and the year-on-year rates of change since this spring were revised downward by about 0.7 percentage points. This is mainly because a reduction in mobile phone charges made a further negative contribution with the rebasing.
7 Temporary factors such as a change in price plans for mobile phone charges and large fluctuations in energy prices should be excluded to capture actual developments in prices. When excluding these factors, the rebased CPI has been marginally positive.