“…There are at least two reasons to specify that the national net wealth is positive in the literature. First, based on Mendoza et al (2009), Schubert and Turnovsky (2011), and Bouza and Turnovsky (2012), the restriction of net positive wealth implies that the economy must have the ability to repay its debt, i.e., the economy is solvent. Second, in his early study, Modigliani (1986, p. 307) points out that, "in view of the practical impossibility of having negative net worth, people tend to die with some wealth."…”