How does the GNI of a country affect its life expectancy?

The Gross National Income (GNI) of a country often correlates with life expectancy, as higher GNI typically indicates better access to healthcare, nutrition, and education. Wealthier nations can invest in healthcare infrastructure, disease prevention, and social services, leading to improved overall health outcomes. Conversely, lower GNI may result in inadequate healthcare resources, higher poverty rates, and limited access to essential services, which can negatively impact life expectancy. Thus, while GNI is not the sole determinant, it plays a significant role in shaping the health and longevity of a population.