Small-scale human societies range from foraging bands with a strong egalitarian ethos to more economically stratified agrarian and pastoral societies. We explain this variation in inequality using a dynamic model in which a population's long-run steady-state level of inequality depends on the...

Using trust games, we study how promises and messages are used to build new trust where it did not previously exist and to rebuild damaged trust. In these games, trustees made non-binding promises of investment-contingent returns, then investors decided whether to invest, and finally trustees...

Agent-centered models usually consider only individual-level variables in calculations of economic costs and benefits. There has been little consideration of social or cultural history on shaping payoffs in ways that impact decisions. To examine the role of local expectations on economic...

Many economic interactions are characterized by “all or nothing” action spaces that may limit a demonstrable index of trust and, therefore, the propensity to reciprocate. In two experimental trust games, the action space governing investments was manipulated to examine the effects on...

Human-robot interactions requiring trust are increasingly common in the marketplace, workplace, on the road, and in the home, yet little is known about human willingness to make trust-based investments with non-human agents (i.e., “robots”) and the emotional reactions these interactions...

Many economic interactions rely on trust, which is sometimes violated. The fallout from business fraud and other malfeasance shows serious economic consequences of trust violations. Simple rules mandating minimum standards are attractive because they prevent the most egregious trust violations....

Many economic interactions are characterized by “all-or-nothing” action spaces that may limit the demonstrability of intended trust. We investigate whether restricting investment opportunities to all-or-nothing options affects the investment rate and propensity to reciprocate. We do this by...