“…The success of this model largely depends on consumer willingness to pay for freemium services (Li and Cheng, 2014;Wagner et al, 2014;Hamari et al, 2017a). Yet, persuading users to spend money on these services represents a major business challenge (Dinsmore et al, 2017), especially when consumers have plenty of free alternatives, a deeply entrenched 'free-lunch' mentality (Dou, 2004;Lin et al, 2013;Ye et al, 2004) and reference prices close to zero (Papies et al, 2011), which leads to a general belief that 'content is free' (Li and Cheng, 2014;Pauwels and Weiss, 2008;Yang et al, 2015). Furthermore, users may perceive a certain degree of unfairness associated with paying for online content, given that MSS advertising revenues are considered enough to support their financial viability (Lin et al, 2013;Ye et al, 2004;Wang et al, 2005).…”