Regional economic disparities in India are caused by a combination of factors, including unequal distribution of natural resources, lack of infrastructure development, and inefficient government policies.

The National Capital Region (NCR) has the highest per capita income in India, followed by Maharashtra, Gujarat, and Karnataka.

Bihar has the lowest per capita income in India, followed by Jharkhand, Chhattisgarh, and Odisha.

India's Human Development Index (HDI) is 0.645, which is considered to be medium.

Kerala has the highest HDI in India, followed by Himachal Pradesh, Goa, and Punjab.

Bihar has the lowest HDI in India, followed by Jharkhand, Chhattisgarh, and Madhya Pradesh.

India's Gini coefficient is 0.35, which indicates a moderate level of income inequality.

Bihar has the highest Gini coefficient in India, followed by Jharkhand, Chhattisgarh, and Odisha.

Kerala has the lowest Gini coefficient in India, followed by Himachal Pradesh, Goa, and Punjab.

The main challenges in reducing regional economic disparities in India include lack of political will, inadequate financial resources, and weak implementation of policies.

The key policy measures that can be taken to reduce regional economic disparities in India include investing in infrastructure development, promoting industrialization in backward regions, and providing skill development training to the workforce.

The central government plays a crucial role in reducing regional economic disparities in India by formulating and implementing policies, providing financial assistance to states, and monitoring and evaluating the progress of development programs.

State governments play a significant role in reducing regional economic disparities in India by implementing central government policies, formulating and implementing state-specific policies, and mobilizing resources for development programs.

The private sector can contribute to reducing regional economic disparities in India by investing in infrastructure development, setting up industries in backward regions, and providing employment opportunities.

Civil society organizations play an important role in reducing regional economic disparities in India by advocating for policy changes, implementing development programs, and mobilizing public support for development initiatives.