Abstract
Policymakers are stuck in time. Political short-termism, policy myopia, policy short-sightedness, and similar words have been coined to emphasize the present-centric policy thinking. Politics tends to produce short time horizons, and as a result, policymakers often fail to use present opportunities to mitigate future harms. Focusing on fiscal and monetary strategic interactions, given different separate decision makers, our paper aims to explore the effects of policymakers’ time horizons on debt stabilization. To formalize our ideas, we use the novel concept of Nonlinear-model-predictive-control Feedback Nash Equilibrium (NFNE) and find that present-centric policy thinking and decision horizons matters under several dimensions.
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Notes
Except in the case in which he agrees with the other members of the group (with a quid pro quo).
The model collapses to Tabellini (1986) for α = 0.
This formalization represents the NFNE. A full discussion on the idea of NFNE and a comparison with other equilibrium concepts can be found in Di Bartolomeo et al. (2017). See also van den Broek (2002), for a similar concept based on repetitions of infinite horizon problems. Under some circumstances (in particular, long horizons), the NFNE may approximate the open-loop Nash equilibrium.
These are obtained implementing Grüne et al. (2015) routines adapted to a differential game context.
Calibration is similar to that proposed by Engwerda et al. (2013). However, our results are qualitatively robust to changes in the calibration. Further numerical simulations are available upon request. It is also worth noting that different calibrations may lead to different equilibrium, which in this game can be not unique (see Engwerda et al. 2013).
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Acknowledgements
The authors acknowledge Francesco Forte for his detailed suggestions. They are also grateful for comments from Bas van Aarle, Jacob Engwerda, Silvia Fedeli, Paul Levine, Behnaz Minooei Fard, Joseph Plasmans, Davide Ticchi, Ronald Wintrobe, and participants from the special session in honour of Francesco Forte at the VII MPT Workshop. The authors also acknowledge financial support by Sapienza University of Rome.
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Di Bartolomeo, G., Di Pietro, M., Saltari, E. et al. Public debt stabilization: the relevance of policymakers’ time horizons. Public Choice 177, 287–299 (2018). https://doi.org/10.1007/s11127-018-0584-7
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DOI: https://doi.org/10.1007/s11127-018-0584-7