“…This separates the spending decision into the stages of 'whether' and 'how much' to spend. This model has been used widely in different fields, such as the evaluation of public goods (Saz-Salazar and Rausell-Köster, 2008;López-Mosquera and Sánchez, 2011;Marzetti et al, 2011;Marzetti and Disegna, 2012), food expenditure (Newman and Matthews, 2001;Bai et al, 2010), analysis of consumption (Jones and Yen, 2000;Aristei and Pierani, 2008), and visitors' expenditure (Hong et al 1999;Weagley and Huh, 2004;Hong et al, 2005;Nicolau and Màs, 2005;Jang et al, 2007;Jang and Ham, 2009;Kim et al, 2010;Brida et al, 2012b). Cragg's (1971) approach estimates a probit model for the first stage, whereas a log-normal or truncated normal model is used for the amount of spending.…”