A recent study of 15 diverse populations, reported in the journal Science, found that the societies that treat anonymous strangers most fairly are those with market economies. As Robert Wright has emphasized, as people become increasingly inter-dependent, the scope of moral concern expands accordingly.
即便是资本这种被认为最邪恶的力量也令我们变得更加友善。据《科学》期刊登载的一篇针对15个不同人群的研究报告指出，那些实行市场经济的社会对待陌生人更为公平。正如罗伯特·怀特强调的那样，随着人们变得更加互相依赖，道德关注的范围也随之延伸。