This paper develops a dynamic model of technology adoption featuring strategic complementarities: the benefits of usage increase with the number of adopters. We study the diffusion of new means of payments, where such complementarities are pervasive. We show that complementarities give rise to...

In October 2014, all 4,494 undergraduates at the Massachusetts Institute of Technology were given access to Bitcoin, a decentralized digital currency. As a unique feature of the experiment, students who would generally adopt first were placed in a situation where many of their peers received...

Despite advances in transactions technologies, paper currency still constitutes a notable percentage of the money supply in most countries. For example, it constitutes roughly 10% of the US Federal Reserve's main monetary aggregate, M2. Yet, it has important drawbacks. First, it can help...

We consider how a central bank digital currency (CBDC) could transform all aspects of the monetary system and facilitate the systematic and transparent conduct of monetary policy. In particular, we find that CBDC can serve as a practically costless medium of exchange, secure store of value, and...

We model the competition between digital forms of fiat money and private digital money (PDM). Countries strategically digitize their fiat money -- upgrading existing or launching new payment systems (including CBDCs) -- to enhance adoption and counter PDM competition. A pecking order emerges:...

We study the impact of mobile money transfers to a representative sample of low-income Ghanaians during the COVID-19 pandemic. The announcement of the upcoming transfers affects neither consumption, well-being, nor social distancing. Once disbursed, transfers increase food expenditure by 8%,...

Variation in technology adoption is a key driver of differences in productivity. Previous studies sought to explain variations in technology adoption by heterogeneity in profitability, costs of adoption, or other factors. Less is known about how adoption is affected by bias in the perceived...

Local opinion leaders may play a key role in easing information frictions associated with technology adoption. This paper analyzes the influence of physician investigators who lead clinical trials for new cancer drugs. By comparing diffusion patterns across 21 new cancer drugs, we separate...

Performance-raising practices tend to diffuse slowly in the health care sector. To understand how incentives drive adoption, I study a practice that generates revenue for hospitals: submitting detailed documentation about patients. After a 2008 reform, hospitals could raise their Medicare...

We ask whether epidemic exposure leads to a shift in financial technology usage within and across countries and if so who participates in this shift. We exploit a dataset combining Gallup World Polls and Global Findex surveys for some 250,000 individuals in 140 countries, merging them with...