“…In general, researchers have focused on finding a suitable set of design parameters that could lead to a fair valuation of such contracts. Many studies have also investigated the interactions between the contract parameters that define the insurer's and customers' risk situations (e.g., Gatzert and Kling, 2007;Kling, Richter, and Ruß, 2007b;Le Courtois and Quittard-Pinon, 2008;Schmeiser and Wagner, 2015). Other authors, such as Ruß (2007a,2007b), Graf, Richter, and Ruß (2011), Zemp (2011), and Bohnert and Gatzert (2012), have investigated different schemes for distributing surplus and the effects of such schemes on both the fair valuation of contracts and the insurer's risk exposure.…”