Globalization is changing population dynamics around the world. It accelerates demographic transition as countries develop economically and socially. There are five stages of demographic transition: early on, birth and death rates are both high; eventually, death rates fall due to improved health conditions while birth rates remain high, causing population growth. Later, as countries develop further, birth rates also fall as women's roles change and family planning increases. Some countries now have low or even negative population growth as birth rates drop below death rates. Globalization also influences migration patterns, concentrating new industries in some areas and reducing jobs in others, pushing and pulling people between places. Factors like cost, policy, and information availability can intervene to obstruct migration.