. The bio-economic model allows the existence of jointness in sites to be tested, i.e. to ascertain if the sequential …

. A sufficient condition for jointness in sites is that the revenue or the variable cost of a site change with the regime …. Jointness in sites may arise from the revenues side or from the costs side or from both sides simultaneously. The revenue is a … bio-economic source of jointness in sites because it derives from the different dynamics of the population of foraging …