What is demographic dividend? What are the different mechan

What is demographic dividend? What are the different mechanisms through which demographic dividend contribute to economic growth? Why , despite favorable age structure , demography can be a burden for a country like India or Bangladesh? ( 400 words)What is micro credit? In what ways can micro credit benefit the poor? In what ways can micro credit hurt the poor? (Feel free to give examples and cite data) ( 400 words)