Discounting under Disagreement

Geoffrey Heal, Antony Millner

NBER Working Paper No. 18999
Issued in April 2013, Revised in February 2014
NBER Program(s):Environment and Energy Economics, Public Economics

A group of agents disagree about the appropriate inter temporal preferences to use when exploiting a common productive resource. They thus delegate decision making to a social planner who allocates consumption efficiently across heterogeneous individuals and over time. We define `policy equivalent' representative agents as those agents whose optimal consumption plan reproduces the optimal aggregate consumption plan of the group, and find conditions that must be satisfied by all such representative preferences. We then show that any policy equivalent representative agent must have a rate of time preference that approaches the lowest rate in the population asymptotically. We characterize the term-structure of separable policy-equivalent preferences in the the case of common felicity functions, and show that if the felicity function is iso-elastic, and time preferences are gamma distributed, representative agents must have hyperbolic time preferences. This gives a normative significance to such preferences, which have hitherto been seen as an entirely behavioral phenomenon. Finally, we examine the temporal stability of representative preferences if the planner cannot commit to inter temporal allocations. We show that while consumption plans are not time consistent, they are renegotiation proof, and thus stable under proposals for change. We argue that this feature has normative appeal for public decision-making.

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Document Object Identifier (DOI): 10.3386/w18999

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