The purchasers of promises will know that the sellers normally know much more than they do about their prospects. The name for this is “asymmetric information.” They will also know that those who have no intention of keeping their word will always make more attractive promises than those who do. This is “adverse selection.” They will know that even those who are inclined to be honest may be tempted… not to keep their promises. The source of this is “moral hazard.” The answer to adverse selection and moral hazard… is to collect more information. But this too has a drawback: “free-riding”… [T]hose who have made no investment in collecting [information] can benefit from the costly efforts of those who have… That will, in turn, reduce the incentive to invest in such information, thereby making markets subject to the vagaries of “rational ignorance.” If the ignorant follow those they deem to be better informed, there will be “herding.” Finally, where uncertainty is pervasive and inescapable — who, for example, knows the chances of nuclear terrorism or the economic impact of the internet? — the herds are likely both to blow and ultimately to burst “bubbles.”
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