Akerlof and Shiller succeed, too, in demonstrating that conventional macroeconomic analyses often fail because they omit not just readily observable facts like unemployment and institutions such as credit markets but also harder-to-document behavioral patterns that fall within the authors' notion of 'animal spirits.' Confidence plainly matters, and so does the absence of it. When the public mood swings from exuberance to anxiety, or even fear, the effect on asset prices as well as on economic activity outside the financial sector can be large.