The present article presents a brief theoretical overview about the role of
trust in promoting cooperation in public goods dilemmas. Until now, no res
earch has been conducted to explore the different psychological variables w
hich are related to trust and which may help clarify the role of trust in p
ublic goods dilemmas. This article proposes some theoretical assumptions wh
ich explain that trust reduces people's experiences of fear of exploitation
. This article also relates the concept of trust to perceptions of fairness
and collective efficacy. Finally, some empirical evidence is presented to
test these assumptions. Results show that trust seems, indeed, to have an e
ffect on people's experiences of fear and, even more importantly, the power
of trust to reduce fear seems to be strongly related to perceptions of fai
rness and collective efficacy.