Abstract
Social benefits in the distant future receive very little importance when a public policy analysis uses a constant-discounting model with its geometric timing weights to compare future benefits with present costs. This paper defines conditions on social preferences that imply a model having arbitrary timing weights. We then introduce a condition on preferences that restricts this general model to one in which the timing weights are linear fractional This model is proposed as an alternative to the constant-discounting model. It accords far more importance to the distant future than does constant discounting, and like constant discounting it depends on the assessment of a single parameter.
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