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Should legal rules be designed exclusively based on efficiency considerations, or should they also attempt to promote an equitable distribution of social resources? The answer traditionally associated with scholarship in law and economics is that they should focus only on efficiency. Even for a society that cares about achieving an equitable distribution of resources by income, the argument goes, it is generally better to adopt legal rules based exclusively on efficiency considerations while relying on the income tax and transfer system to promote distributional goals. However, even proponents of the claim that social welfare is best promoted through the adoption of efficient legal rules agree that there are certain conditions under which it does not apply. This Essay considers when legal rules should be efficient and when they should not. It focuses on conditions that can cause the socially optimal legal rule to diverge from the efficient legal rule—i.e., the legal rule that would be optimal absent distributional considerations. Its goal is to translate these arguments to settings where the question of interest relates to the design of a legal rule rather than, say, the design of a commodity tax. In particular, it seeks to clarify the types of arguments that can support the adoption of inefficient legal rules when income taxation is available as a policy tool.

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