Similar to Fischbacher and Gächter (2010) we try to understand and explain the motivation of participants when contributing to a public good. In the Hybrid Public Good experiment each of two interacting contributors chooses an independent contribution level and three adjusted contribution...

Ad-hoc contracting allows to quickly react to changes which could be neglected or noticed too late in case of constant contracting. But always deciding anew, e.g., how much and what to order in commercial and what to buy in private life, is too cumbersome. To capture the cognitive burden of...