Expalin the four stages of Warren Thompson's demographic transition model

Stage 1: both birth and death rates are high. Resulting in constant population size (unless an event takes place like pandemics or wars)

Stage 2: modern medicine lowers death rates while birth rates are the same rapid pace resulting in population growth

Stage 3: birth rates decrease and the population growth continues at a lower rate

Stage 4: birth and death rates are both low. This makes countries have stronger economies, higher levels of education, better healthcare, more working women, and fertility of 2 children per women.