“…Evidence from the business, economics and sociology literatures is inconclusive regarding the behavioural relationship between file-sharing and physical or online acquisition of non-infringing content (Bhattacharjee et al, 2006; Harris and Dumas, 2009; Hietanen et al, 2008; Holsapple et al, 2008; Ingram and Hinduja, 2008; Li and Nergadze, 2009; Oberholzer-Gee and Strumpf, 2007; Plowman and Goode, 2009). The substitution approach to estimating the reduction of revenues resulting from file-sharing or their restoration as a result of efforts to foreclose file-sharing employs standard economic theory of demand substitution – when two similar goods are available in the market, a decline in the price of one will lead to an increase in the quantity demanded of the less expensive good and a ‘substitution’, that is, a reduction in the quantity demanded of the other.…”