Why is an understanding of what development means crucial to policy formulation in developing nations? Why do you think a country may have difficulties in agreeing on a rough definition of development? Why do we use purchasing power parity measures when comparing incomes across countries? Suppose that you had to explain this graph to someone who is not a visual learner He just doesnt get pictures. You have to explain every feature of the graph using words. What are the components of the Human Development Index? What are some strengths and weaknesses of the HDI as a comparative measure of human welfare?