<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Relevant discussion may be found on the talk page . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (November 2016) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Relevant discussion may be found on the talk page . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (November 2016) (Learn how and when to remove this template message) </Td> </Tr> <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> The demographic transition model, in isolation, can be taken to predict that birth rates will continue to go down as societies grow increasingly wealthy; however, recent data contradicts this, suggesting that beyond a certain level of development birth rates increase again . In addition, in the very long term, the demographic transition should be reversed via evolutionary pressure for higher fertility and higher mortality . </P>

Who created the demographic transition model (dtm)