Final answer:
Income differences have been associated with improved health and life expectancy, although the exact percentage may vary. Other factors such as education and access to healthcare also play crucial roles.
Step-by-step explanation:
Improving health and life expectancy is influenced by various factors, including income differences. Income is often associated with access to better healthcare, nutrition, and living conditions, which can positively impact health outcomes and life expectancy. However, the specific income difference required to observe these improvements may vary depending on various societal and contextual factors.
For instance, a study conducted by the World Health Organization found that higher income levels are generally associated with better health outcomes and longer life expectancy. However, it is important to note that income inequality alone does not guarantee improvements in health and life expectancy.
Other factors such as education, lifestyle choices, genetic predispositions, and access to healthcare services also play significant roles in determining health outcomes and life expectancy.