An important aspect of managing social platforms, online games and virtual worlds is the analysis of user characteristics related to subscriptions and virtual goods purchases. The results of such a process could be adopted in decision support applications that build on top of users’ behavior provide efficient strategies for the virtual world’s management. One of the research questions in this a...

A constraint satisfaction problem (CSP) model can be preprocessed to ensure that any choices made will lead to solutions, without the need to backtrack. This can be especially useful in an interactive context in which different users access the model to make choices on-line, e.g. in e-commerce configuration. The conventional machinery for ensuring backtrack-free search, however, adds additional...

This paper seeks to explain why annuity purchases are postponed a later age. We consider an overlapping generations model with uncertain lifetime and two types of annuities. It is shown that, if the economy dynamically inefficient, individuals demand annuities without delay. However, it efficient, postponed. also show that these results robust several extensions.