“…Studies by Gil-Alana et al (2004), Gil-Alana (2005, 2010, 2011, Cunado et al (2004Cunado et al ( , 2005Cunado et al ( , 2008aCunado et al ( , 2008b, Gil-Alana et al (2008), Chu (2008Chu ( , 2009, Gil-Alana and Fischer (2010), Assaf et al (2011Assaf et al ( , 2012, Nowman and Van Dellen (2012), Chen andMalinda (2014), Gil-Alana et al (2014), Gil-Alana et al (2015, Al-Shboul and Anwar (2017), Apergis et al (2017), Andraz et al (2018), Huijbens (2018), Caporale and Gil-Alana (2019), Gil-Alana et al (2019), Gil-Alana et al (2020, and Perez-Rodriguez and Santana-Gallego (2020) have applied fractional integration techniques with respect to various tourism indicators across a range of countries. In the vast majority of these studies, the differencing parameter is more often than not less than one, with the respective time series generally displaying mean reversion.…”