A good reading of what the questions ask for and solid responses that account for everything the questions deal with.
Never quantify lengths of responses, answer in at least 400-500 words.
1. What are the most significant risk factors for anyone living on less than $2 a day? Bear in mind that children are more vulnerable than anyone else.
2. How did the global financial meltdown of 2008 occur and what were its effects on developing countries?
3. What are the effects of war on a country's development? This may seem obvious, but it's more complicated than a mere disruption of the normal business cycle, so look at the long-term consequences.
4. What exactly is an institution and why, according to Daron Acemoglu and James A. Robinson, do weak institutions cause some nations to fail?