In a laboratory experiment we study how costly punishment behavior of second and third parties in a social dilemma situation is affected by monitoring costs. Subjects have to pay a fee over and above punishment costs if they wish to condition punishments on previous play, which is equivalent to...

Enforcement agencies issuing warnings are an empirical regularity in the enforcement of laws and regulations, but a challenge to the standard economic theory of public enforcement. A number of recent contributions explain the popularity of warnings as a response to information asymmetries...

Is feedback on trustworthiness necessary for the functioning of economic relationships? In many real-world economic environments, such feedback can at best be acquired through costly monitoring, raising questions of how trust and efficiency can be maintained. In the lab, we conduct a modified...

Are prices or quantities the best regulatory instrument to align private actions with public interests in the presence of externalities? We add another dimension to this ongoing debate by experimentally analyzing the interaction between instrument choice and intrinsic motivation of regulated...

The literature on environmental R&D frequently studies innovation as a two-stage process, with a single R&D event leading from a conventional polluting technology to a perfectly clean backstop. We allow for uncertainty in innovation in that the new technology may turn out to generate a new...

We study the optimal R&D trajectory in a setting where new technologies are never perfect backstops in the sense that there is no perfectly clean technology that eventually solves the pollution problem once and for all. New technologies have stings attached, i.e. each emits a specific stock...

The success of global climate policies over the coming decades depends on the diffusion of 'green' technologies. This requires that international environmental agreements (IEAs) and trade-related intellectual property rights (TRIPs) interact productively.Using a simple and tractable model, we...

The success of global climate policies over the coming decades depends on the diffusion of 'green' technologies. This requires that international environmental agreements (IEAs) and trade-related intellectual property rights (TRIPs) interact productively.Using a simple and tractable model, we...