“…This potential causal relationship has been explored by both ecological and economic theory (Baker, 2003;Ember and Ember, 1992), and many anthropological cases have been documented in detail (Carneiro, 1990;Dean, 1996;Haas, 1990;Haas and Creamer, 1993;Jones et al, 1999;Kuhlken, 1999;Lambert, 1994;Lekson, 2002;Otterbein, 1985Otterbein, , 1997Otterbein, , 1999Tainter and Tainter, 1996).…”