1. How could the experimental results be considered as supporting the IA model?

2. The IA model predicts that fair-minded agents will choose a lower level of effort with respect to purely selfish agents. Why could this happen?

3. Think about other possible forms of contract (excluding those presented in FKS (2004)) that might be used to motivate agents, given the existence of inequality aversion and reciprocity.

4. What do you think about the use of payment structures based on trust in laboratory experiments?

Consider, for instance, the case in which subjects are paid with different methods: a unique final payment depending on the performance of a subject in a certain (computational) task or an initial flat payment that does not (obviously) depend on the performance. How could subjects' performance be affected? Is this related to reciprocity or inequality aversion?