READ MOREThe benefits are calculated based on the Monthly Labor Survey, carried out by the Ministry of Health, Labor and Welfare. The survey looks at wage levels, working hours and other elements that make up the current jobs picture.
But the survey was recently found to have skipped over a swath of big companies in Tokyo.
A ministry investigation has found that the wage levels these monthly surveys have shown were lower than what they would have been if they had included figures at large businesses, where wages are relatively high.
The ministry has failed to correct the situation for about 14 years, the ministry's own investigation shows. ■