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Introduction and overview
Since its original formulation in the 1940s (Davis 1945; Notestein 1945), the phenomenon known as 'the global demographic transition' has been used to understand the trend of structural population ageing, and with it, the slowing and ultimately the ending of population growth – now anticipated globally around the end of the present century (Lutz, Sanderson & Sherbov 2004). However as originally conceptualised, the theory pertained to 'closed' populations, in which the only dynamics were birthsdoi:10.26686/pq.v13i0.4554 fatcat:xtfmrrfetjf47buigoqg6k5ely