Add to ORKGHuman attention, valuable and limited in supply, is a resource. It has become commonplace, especially in the media and technology industries, to speak of an attention economy and of competition in attention markets.” There is even an attentional currency, the basic attention token, which purports to serve as a medium of exchange for user attention. Firms like Facebook and Google, which have emerged as two of the most important firms in the global economy, depend nearly exclusively on attention markets as a business model. Yet despite the well-recognized commercial importance of attention markets, antitrust and consumer protection authorities have struggled when they encounter the attention economy. Antitrust agencies, tasked with asses...