“Zero-price markets,” wherein firms set the price of their goods or services at $0, have exploded in quantity and variety. Creative content, software, search functions, social media platforms, mobile applications, travel booking, navigation and mapping systems, and myriad other products are...

We use consumer panel data to calculate the damage suffered by German consumers due to a detergent cartel that was active between 2002 and 2005 in eight European countries. Applying before-and-after and difference-in-differences estimations we find average overcharges between 6.7 and 6.9 percent...