<P> Demographic transition ( DT ) is the transition from high birth and death rates to lower birth and death rates as a country or region develops from a pre-industrial to an industrialized economic system . The theory was proposed in 1929 by the American demographer Warren Thompson , who observed changes , or transitions , in birth and death rates in industrialized societies over the previous 200 years . Most developed countries have completed the demographic transition and have low birth rates ; most developing countries are in the process of this transition . The major ( relative ) exceptions are some poor countries , mainly in sub-Saharan Africa and some Middle Eastern countries , which are poor or affected by government policy or civil strife , notably , Pakistan , Palestinian territories , Yemen , and Afghanistan . </P>
<P> Demographic transition ( DT ) is the transition from high birth and death rates to lower birth and death rates as a country or region develops from a pre-industrial to an industrialized economic system . The theory was proposed in 1929 by the American demographer Warren Thompson , who observed changes , or transitions , in birth and death rates in industrialized societies over the previous 200 years . Most developed countries have completed the demographic transition and have low birth rates ; most developing countries are in the process of this transition . The major ( relative ) exceptions are some poor countries , mainly in sub-Saharan Africa and some Middle Eastern countries , which are poor or affected by government policy or civil strife , notably , Pakistan , Palestinian territories , Yemen , and Afghanistan . </P>
who created the demographic transition model ( dtm )
who created the demographic transition model ( dtm )
American demographer Warren Thompson
American demographer Warren Thompson