Efficient Risk Sharing with Limited Commitment and Hidden Saving
In the typical model of risk sharing with limited commitment (e.g. Kocherlakota, 1996) agents do not have access to any technology transferring resources intertemporally. In our model, agents have a private (non-contractible and/or non-observable) saving technology. We first show that, under general conditions, agents would like to use their private saving technology, i.e. their Euler constraints are violated at the constrained-optimal allocation of the basic model. We then study a problem where both the default and saving incentives of the agents are taken into account. We show that when the planner and the agents have access to the same intertemporal technology, agents no longer want to save at the constrained-optimal allocation. The reason is that endogenously incomplete markets provide at least as much incentive for the planner to save, because she internalizes the effect of aggregate assets on future risk sharing. This implies that aggregate savings are positive in equilibrium even when there is no aggregate uncertainty and the return to saving is below the discount rate. Further, we show that assets remain stochastic whenever only moderate risk sharing is implementable in the long run, but become constant if high but still imperfect risk sharing is the long-run outcome. In contrast, if the return on saving is as high as the discount rate, perfect risk sharing is always self-enforcing in the long run. We also show that higher consumption inequality implies higher public asset accumulation. In terms of consumption dynamics, two counterfactual properties of limited commitment models, amnesia and persistence, do not hold in our model when assets are stochastic in the long run. We also provide an algorithm to solve the model, and illustrate the effects of changing the discount factor and the return to saving by computed examples.
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