The Evolution of Human Life Expectancy and Intelligence in Hunter-Gatherer Economies
从经济学角度分析狩猎采集社会中的代际资源流动，认为这种流动替代生育成为关键人口因素，从而理论上解释了为何人类预期寿命和脑容量会同步增长。
The economics of hunting and gathering must have driven the biological evolution of human characteristics, since hunter-gatherer societies prevailed for the two million years of human history. These societies feature huge intergenerational resource flows, suggesting that these resource flows should replace fertility as the key demographic consideration. It is then theoretically expected that life expectancy and brain size would increase simultaneously, as apparently occurred during our evolutionary history. The brain here is considered as a direct form of bodily investment, but also crucially as facilitating further indirect investment by means of learning-by-doing.