A study highlighted that the wage gap between regions in Japan has exceeded ¥150,000 in the past 25 years. The findings raise concerns about disparities in economic opportunities across the nation. The study further explores the causes, impacts, and potential solutions to this widening income inequality. This issue is attracting national attention as it adversely affects the financial stability of households and regional economies.

In Japan, income disparity is a significant issue that is linked to many social problems, such as poverty and social exclusion. Society values fairness and economic equality, and people are concerned about the influence of this wage gap on social stability and regional economic vitality. It's also a matter of national significance since it marks an imbalance in the Japanese economy.

In contrast, the US and EU have higher levels of regional wage disparity. Although this issue also exists in these areas, the approach to the problem might be different due to their different market structures and labor regulations. The US and parts of the EU tend to have more negotiation power for wages in major cities, contributing to an even larger gap.