“…Although our model is more flexible than previously published customer-based corporate valuation models (e.g., in terms of the dynamics that it can accommodate), it has nevertheless remained parametrically parsimonious because the available data are limited and will likely stay that way for the foreseeable future. For example, it is highly unlikely that firms will begin to disclose the kinds of data required to properly account for other sources of customer value, such as the referral value of a customer (Kemper 2010; Kumar et al 2010; Kumar, Petersen, and Leone 2007), the impact of social media (Luo, Zhang, and Duan 2013; Yu, Duan, and Cao 2013), customer satisfaction (Anderson, Fornell, and Mazvancheryl 2004; Homburg, Koschate, and Hoyer 2005; Luo and Bhattacharya 2006), or heterogeneity in the spend per customer (McCarthy, Fader, and Hardie 2016). At the same time, indirect proxies for these factors may be obtainable in some cases through external data sources for a small subset of companies.…”