This post comes to us from Yeon-Koo Che of Columbia University and Yonsei University and Navin Kartik of Columbia University.
Difference of opinion would be obviously valuable if it inherently entails a productive advantage in the sense of bringing new ideas or insights that would otherwise be unavailable. But could it be valuable even when it brings no direct productive advantage? Moreover, are there any costs of people having differing opinions? In our forthcoming Journal of Political Economy paper entitled Opinions as Incentives, we explore these questions by examining the incentive implications of difference of opinion.
We employ a framework that captures common themes encountered by many organizations. More specifically, we study a setting in which a decision maker, or DM for short, consults an adviser before making a decision. Both individuals’ payoff from the decision depends on some exogenous state of the world. We model the decision and the state as real numbers, where the DM’s payoff-maximizing decision is equal to the state. At the outset, however, neither the DM nor the adviser knows the state; they only hold some prior views about it. The adviser can exert costly effort to try and discover an informative signal about the state; the probability of observing such a signal is increasing in his effort. Effort is unverifiable, however, and higher effort imposes a greater cost on the adviser. After the adviser privately observes the information, he strategically communicates with the DM. Communication takes the form of verifiable disclosure: sending a message is costless, but the adviser cannot falsify information, or equivalently, the DM can judge objectively what a signal means. The adviser’s strategic choice therefore is whether or not to reveal any information he has acquired. Finally, the DM makes her decision given her updated beliefs after communication with the adviser.
