Hagen et al. (in press). Do human parents face a quantity-quality tradeoff? Evidence from a Shuar community. American Journal of Physical Anthropology.   More publications... Institute for Theoretical Biology, Humboldt-Universität zu Berlin Invalidenstraße 43, 10115 Berlin, Germany e.hagen@biologie.hu-berlin.de, phone: +49/30 2093-8649