Regulation has been and still is often discussed in economic theory and politics. Despite this, papers analyzing regulatory measures lack a definition of the term or employ widely differing concepts. In order to remedy this neglect, we give a short survey of various definitions of regulation....

The decision to contact a physician and the decision, how often to contact a physician, are based on different decision makers. We introduce a negative binominal distributed hurdle model that specifies the two stages of the decision process as different stochastic processes, and takes also care...