Hunger: A Complex Issue of Production, Distribution, and Affordability

There are people in every country who suffer from hunger. Discuss Hunger and try to explain by doing some research why there is hunger in the world?
Is it a food production problem or a distribution problem?
Are prices of food too high that some people cannot afford to eat?
What other factors may contribute to hunger ?
Limit to answer to at least 300 (NO more than 350 words). I need at least 2 cited sources of research. NO Plagiarism (use your own words).