Most of the time it is, unfortunately, low education. Rapid population increase isn't too far behind, but if a population lacks education there would be little room for the economy to increase and a rapid population increase would effect problems more associated with resources and living space, depending on the country/area.
i think this one ill just say im glad to be here and yonr thank you so much shoutout to him he da man! anyways i love you brosyie and ill see you in a while..... oh and my answer? Poop