We assess in the laboratory the impact of promises on group decision-making. The gift-exchange game provides the testing ground for our experiment. When played between groups, inter-group cooperation and reciprocity represent a condition for efficiency in overall decision making. We find that...

pt. 1. Evidence on the neuroscientific foundations of decision-making -- pt. 2. Emotions and morality in decision-making -- pt. 3. Learning and risk attitude in decision-making -- pt. 4. Probability and judgment in decision-making -- pt. 5. Decision-making in social interaction.