Competition for Retail Deposits Between Commercial Banks and Non-Bank Operators : A Two-Sided Platform Analysis

Commercial banks' mainstream business model, which is reliant on a stable supply of retail deposits, continues to be challenged by new and innovative sources of non-bank competition. This paper examines the implications of one such source: a substitute for commercial banks' personal and saving accounts that provides a safer money storage option thanks to access to a central bank's balance sheet. I model competition for retail deposits between a bank and a non-bank payment service operator by adopting the two-sided platform framework to capture the payment functionality between consumers and merchants under various configurations. I show that banks' mainstream business model is most vulnerable when consumers perceive the two service providers as close substitutes; they have the option to sign up with both service providers; their distribution of deposit is skewed; and they are not allowed to make payments across platforms