We study the effects of online content moderation on user behavior in the context of a prominent case study: the deletion of President Donald Trump's Twitter account on January 8th, 2021. We provide four key findings. First, the toxicity of tweets sent by Trump followers relative to a...

We study whether social media can contribute to hatred against minorities with a focus on Donald Trump's political rise. To establish causality, we construct an instrument for Twitter usage based on the platform's early adopters at the South by Southwest (SXSW) festival in 2007, who were crucial...

The County Business Pattern ("CBP") files contain employment and establishment counts for detailed industry codes covering all counties in the United States. The contribution of this project is to digitize, clean, and prepare the CBP files from 1946-1974. We also apply the methods developed in...

Enrico Bombieri proved that the ABC Conjecture implies Roth's theorem in 1994. This paper concerns the other direction. In making use of Bombieri's and Van der Poorten's explicit formula for the coefficients of the regular continued fractions of algebraic numbers, we prove that Roth's theorem...

The paper describes the "Halle Institute for Economic Research (IWH) Forecasting Dashboard (ForDas)". This tool aims at providing, on a non-commercial basis, historical and actual macroeconomic forecast data for the Germany economy to researchers and interested audiences. The database renders it...

We study the relationship between credit expansions, macroeconomic fluctuations, and financial crises using a novel database on the sectoral distribution of private credit for 117 countries since 1940. We document that, during credit booms, credit flows disproportionately to the non-tradable...

We study the role of export credit agencies--the predominant tool of industrial policy--on firm behavior by using the effective shutdown of the Export-Import Bank of the United States (EXIM) from 2015-2019 as a natural experiment. We show that firms that previously relied on EXIM support saw a...