Financial services built on blockchains are often called decentralized finance (DeFi) protocols. Blockchain banks are important players in the DeFi ecosystem and can pose systemic risks just like their traditional counterparts. In this paper, we develop a systemic risk measure based on the...

Digitalization and Blockchain have fundamentally transformed the structure of the monetary system. The first wave of cryptocurrencies such as Bitcoin, Ethereum or Ripple have failed to gain relevance in terms of their share in monetary transactions. This was due to systemic deficiencies leading...

Constructing a novel micro-geographic individual-level data set, we study the relevance of shoe-leather costs on cash withdrawals. An unexplored issue in the literature is the consistent estimation of the marginal effect of travel distance on withdrawals when a fraction of unobserved withdrawals...

The market for payment cards is inherently two sided. Consumers benefit from increased merchant acceptance of payment cards and vice versa. To quantify the interdependence of consumer and merchants or network externalities, we construct and estimate a structural two-sided model of a payment...

This paper presents an analytical framework that describes the business model of banks. It draws on the classical theory of banking and the literature on digital transformation. It provides an explanation for existing trends and, by extending the theory of the banking firm, it illustrates how...