Invasive species are one of the main reasons for the loss of biodiversity. Therefore, national strategies are developed to deal with biological invasions. Economic evaluation as a tool of policy advice has to take into account three challenges: (1) reflecting ecological knowledge, which is...

Decision makers lacking crucial specialist know-how often consult with better informed but biased experts. In our model the decision maker's choice problem is binary and her preferred option depends on the state of the world unknown to her. The expert observes the state and sends a report to the...