“…Several laboratory studies have examined the holdout problem. The most relevant for our research are those by Cadigan, et al (2009Cadigan, et al ( , 2011, Swope, et al (2011), Collins and Isaac (2012), Parente and Winn (2012), Shupp, et al (2013), Cadigan, Schmitt and Swope (2014), Zillante, Read and Schwarz (2014), Kitchens and Roomets (2015) and Isaac, Kitchens and Portillo (2016). We summarize these studies in Table 1, listing the treatment variables the authors studied and the primary results.…”