“…The evidence that portability increases the mobility of customers and reduces the switching costs can also be found in other markets, for example, local number portability in the local telephone market (Reinke, 1998;Gans et al, 2001;Haucap, 2003), pension portability (Andrietti and Hildebrand, 2001;Gustman and Steinmeier, 1993) and health insurance portability (Stroupe et al, 2001;Miller, 2002) in the job market, and voucher portability in the housing market (Basolo, 2003).…”