What people believe about the economy—and why it matters How do expectations about the future influence economic behavior? For decades, economists have known that beliefs play a central role—from how much households spend, to how firms set prices, to how central banks design policy. But figuring out exactly how expectations affect decisions has been one of the field’s most persistent empirical challenges. In this book, Olivier Coibion and Yuriy Gorodnichenko present a fresh empirical approach: using randomized controlled trials (RCTs) to study the causal impact of expectations. Drawing on more than a decade of their research, they show how targeted information treatments can generate experimental variation in beliefs—making it possible to measure how those beliefs influence real-world decisions. Along the way, they reassess the limits of the traditional rational expectations framework and offer a richer, evidence-based picture of how people form and act on their views about the