Recent literature has considered the form of loan contract between two or more risk neutral parties where the revelation principle is inappropriate due to the lack of commitment to an auditing policy by the lender. The privately informed debtor has a stochastic return; once he knows the state...

We use a simple Lotka-Volterra model of the disease transmission process to analyse the dynamic population structure in two scenarios. Firstly a vaccine is available\ on the market at a constant price through time. Secondly, the vaccine is publicly provided. The vaccine works either by giving...