Japan is experiencing a significant slowdown in the rate at which it's narrowing the gender wage gap, according to a joint analysis. Despite measures taken to foster a more gender-balanced workforce, Japanese women continue to earn less than their male counterparts. The reasons behind this sluggish progress remain complex and multi-faceted, involving both cultural and institutional barriers.

Japanese society traditionally places emphasis on long working hours, seniority-based pay, and lifetime employment - traits often disadvantageous for women. Despite progress on paper in recent years, real-world results have been disheartening. Public opinion in Japan is increasingly focused on the issue, but this has yet to translate into actionable policy changes at a fast enough pace.

In contrast, the US and EU have been adopting more aggressive policies towards reducing the gender wage gap, including laws requiring equal pay for equal work. However, they too face similar complexities and challenges. It's a global issue that requires radical changes in workplace culture and societal norms, alongside legislative action.