please help on these question

It has been said that "underdevelopment is a state of mind." Comment. How is happiness related to development? Development A) Why utility or income each by themselves can't explain the state of development? give some examples to support your explanation. B) Briefly explain based on Sen's approach how development is defined? Explain how low levels of living can turn into a vicious cycle in developing countries. Explain why purchasing power parity measures of income levels tend to show a smaller difference between poor and rich countries