16% higher modeled six-year value for referred customers in a German bank study.
Track referred enquiries and their outcomes as a distinct acquisition path.
Schmitt and colleagues compared 5,181 referred with 4,633 non-referred German bank customers acquired in 2006, observing behavior for about 33 months and modeling six-year value. The 16% difference is an association after controls, not proof that asking for referrals increases introductions or value.
Source: Schmitt, Skiera & Van den Bulte, Journal of Marketing, 2011 · Study context and citation →