“…For example, Leones et al (1992), Lee (2001), Zheng and Zhang (2013), Barquet et al (2011) and Kim et al (2011), among others, estimated tourism expenditure by means of the Tobit model. More recent applications include the Heckman model, by Alegre et al (2013), the double-hurdle model, by Brida et al (2013), and a subordinated process for the aggregate expenditure (continuous variable) conditional on the length of stay (discrete variable) of tourists at a given location, in the spirit of statistical mixtures (Gómez-Déniz and Pérez-Rodríguez, 2019). According to these studies, the main factors underlying expenditure are socio-economic status, nationality, age, occupation, income, length of stay, type of holiday accommodation, travel companion, destination loyalty and package type.…”