This paper reviews what cryptocurrencies are, and it frames them within the context of historical monetary experiences and contemporary monetary economics. The paper argues that, as pure duciary private money, cryptocurrencies are a bubble without a fundamental value and that they will not...

Central Bank Digital Currency (CBDC) has become a major policy interest among global central banks. However, its introduction faces many challenges including those that are legal, technological and political in nature. In this paper, we summarize those challenges and add a few more that have not...

The Board of Governors of the Federal Reserve System has engaged the public in its consideration of a USD Central Bank Digital Currency (USD CBDC). The Board has framed USD CBDC issues principally around payment market access and efficiency, tending to overlook questions CBDC raises about the...

We study how the introduction of a central bank-issued digital currency affects interest rates, the level of economic activity, and welfare in an environment where both central bank money and private bank deposits are used in exchange. Banks in our model are financially constrained, and the...

We develop a new framework to examine the effects of retail central bank digital currencies (CBDCs) on financial inclusion and stability, particularly how the results depend on an economy's existing degree of financial development. We demonstrate that when offering CBDCs in underdeveloped...

The cryptocurrency Bitcoin has been marketed as revolutionary new money and an attractive investment. But closer examination suggests that Bitcoin works poorly as money and does not qualify as an asset based on user value. Instead, almost all Bitcoin trading has purely speculative purposes

We analyze retail central bank digital currency (CBDC) in a two-tier monetary system with bank deposit market power and externalities from liquidity transformation. Resource costs of liquidity provision determine the optimal monetary architecture and modified Friedman (1969) rules the optimal...

The ongoing initiatives to offer central bank money to consumers in the form of retail central bank digital currency (CBDC) have triggered discussions on its optimal design. So far, the perspective of potential users has not been considered widely. To strengthen this perspective, we survey 2006...

Central Bank Digital Currency (CBDC) has attracted considerable interest and its deployment on a global scale is imminent. However, digital currencies face several challenges. They include: legal, technological, and political considerations. We summarize those challenges and add a few more that...

I discuss private and central-bank-issued digital currencies, summarizing my prior research. I argue that prices of private digital currencies such as bitcoin follow random walks or, more generally, risk-adjusted martingales. For central bank digital currencies, I argue that they enhance the...