The demographic transition theory is a sociological and demographic model that explains the historical shift of populations from high birth and death rates to low birth and death rates as societies undergo economic and social development. This transition typically occurs in four stages, each characterized by distinct demographic patterns. The theory helps in understanding the relationship between population dynamics and the process of economic development. The four stages of the demographic transition theory are as follows: Stage 1: Pre-Transition (High Birth and High Death Rates) In the pre-transition stage, both birth and death rates are high, resulting in slow population growth. Factors such as high infant mortality, lack of access to healthcare, and a predominantly agrarian economy contribute to high death rates. Birth rates are also high due to cultural and societal factors, as well as the need for a large workforce in agriculture. Stage 2: Early Transition (High Birth Rates, Falling Death Rates) The early transition stage is marked by a significant decline in death rates, primarily due to improvements in healthcare, sanitation, and nutrition. While death rates decline, birth rates remain high, resulting in a rapid population growth phase. Industrialization and economic development begin, leading to urbanization and changes in societal structures. Stage 3: Late Transition (Falling Birth Rates, Low Death Rates) In the late transition stage, birth rates start to decline, usually as a result of changing societal norms, increased access to education, and urbanization. Death rates remain low, contributing to a sustained population growth but at a slower pace than in the early transition stage. Economic development, improved healthcare, and increased opportunities for women contribute to lower birth rates. Stage 4: Post-Transition (Low Birth and Low Death Rates) In the post-transition stage, both birth and death rates are low, resulting in a stabilized or even declining population. Societies in this stage typically have advanced economies, high levels of education, and widespread access to healthcare. Family planning, greater gender equality, and a focus on quality of life contribute to lower birth rates. Critiques and Extensions of the Theory: