August 2012 POPULATION THEORIES DEMOGRAPHY THEORIES; MALTHUSIAN, The Reverend  Thomas Robert Malthus   FRS  (13 or 14 February 1766 – 23 or 29 December 1834) was an  English   scholar , influential in  political economy  and  demography . Malthus popularized the economic theory of  rent . Malthus has become widely known for his theories