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This paper examines why economies endow agents with a degree of personal privacy, even when (a) "no privacy" is ex-post (Pareto) efficient, and (b) a costless monitoring technology exists. A government can provide more of a public good only by identifying "valuable" agents from a population of n. All agents report their type to the government --- truthfully or not --- unsure if they, or others, are being observed. When n is small, it is shown that increasing monitoring effectiveness can actually lead to ex-post inefficiency. Political equilibria are also characterized, where agents vote to constrain the government's monitoring effectivenes but not its ability to levy penalties or rewards. When n is large, all such equilibria are efficient; however, a utilitarian government may not implement taxes to reward honest reporting, nor impose penalties to punish it, even when these options ensure full revelation. Legislating a "right to privacy", by contrast, is always inefficient. |
