I think get married at young age doesn't influence and affect much to the economical problems or poverty. The most influential thing and strongly affects to the states poverty is education. The awareness of reading and studying are low, this is become major problem in many countries.
Relates to married at young age, it can be decrease and solve by education. It should be a main focus by the government to do and government should engage their awareness of learning to have better quality of their life, and they can get married when they are ready and good financially.
Education is a very important factor when it comes to try to tell if a person is going to have a good economic future, but marring early most of the time leads to people to have less education because they simply do not have the time to invest in education because they are worried about other things that they have to do now that they are married.