Human altruistic tendencies vary with both the costliness of selfless acts and socioeconomic status
Open Access
- 27 October 2016
- Vol. 4, e2610
- https://doi.org/10.7717/peerj.2610
Abstract
Altruism toward strangers is considered a defining feature of humans. However, manifestation of this behaviour is contingent on the costliness of the selfless act. The extent of altruistic tendencies also varies cross-culturally, being more common in societies with higher levels of market integration. However, the existence of local variation in selfless behaviour within populations has received relatively little empirical attention. Using a ‘lost letter’ design, we dropped 300 letters (half of them stamped, half of them unstamped) in 15 residential suburbs of the greater Perth area that differ markedly in socioeconomic status. The number of returned letters was used as evidence of altruistic behaviour. Costliness was assessed by comparing return rates for stamped vs. unstamped letters. We predicted that there is a positive association between suburb socioeconomic status and number of letters returned and that altruistic acts decrease in frequency when costs increase, even minimally. Both predictions were solidly supported and demonstrate that socioeconomic deprivation and elevated performance costs independently impinge on the universality of altruistic behaviour in humans.This publication has 33 references indexed in Scilit:
- Prosocial preferences do not explain human cooperation in public-goods gamesProceedings of the National Academy of Sciences of the United States of America, 2012
- Lost Letter Measure of Variation in Altruistic Behaviour in 20 NeighbourhoodsPLOS ONE, 2012
- Variation in Cooperative Behaviour within a Single CityPLOS ONE, 2011
- Demography and ecology drive variation in cooperation across human populationsProceedings of the National Academy of Sciences of the United States of America, 2011
- Cryptic multiple hypotheses testing in linear models: overestimated effect sizes and the winner's curseBehavioral Ecology and Sociobiology, 2010
- Muslim Discrimination: Evidence From Two Lost‐Letter ExperimentsJournal of Applied Social Psychology, 2010
- Markets, Religion, Community Size, and the Evolution of Fairness and PunishmentScience, 2010
- Human prosociality from an evolutionary perspective: variation and correlations at a city-wide scaleEvolution and Human Behavior, 2009
- The Lost-Letter Technique: A Tool of Social ResearchPublic Opinion Quarterly, 1965
- The genetical evolution of social behaviour. IJournal of Theoretical Biology, 1964