“…However, considering only the participation or the consumption decision does not reflect the real tourists' decision-making process; the two decisions are not independent and influenced by different sets of variables. A stream of research has recognised this issue and contained the investigation of both decisions simultaneously (Bernini & Cracolici, 2015, 2016Bernini, Cracolici, & Nijkamp, 2017;Jang & Ham, 2009;Jang, Ham, & Hong, 2007;Nicolau & Más, 2005a;Yang, Wu, & Lu, 2019), by means of double-huddle models, as the Heckman (Heckman, 1979) or Cragg model (Cragg, 1971). Double hurdle models consist of a Probit model for the first decision of participating in tourism or not, and a model for the second decision on how much to spend on tourism.…”