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1 results

  • SOCIAL CHOICE AND TIME CONSISTENCY WITH LOW-PROBABILITY EVENTS

  • Claudio A. Bonilla
  • Journal:
    Macroeconomic Dynamics / Volume 21 / Issue 7 / October 2017
    Published online by Cambridge University Press:
    06 June 2016, pp. 1706-1711

  • A key result in macroeconomics is the “time inconsistency of short-run optimal plans.” It is argued that inflationary bias results if central bankers do not precommit to a monetary policy rule. The macro literature, however, does not address the way in which board members arrive at the “optimal choice of inflation rate.” That is a matter of a micro subfield called social choice. If we consider that on any board, members have different priors about the states of nature for the economy, but they all receive the same signal before deciding, then they will have different posterior probabilities for the states, even if they have many data, if one state has a low probability of occurring, such as an unlikely catastrophic-risk event. Thus, it is not clear what the optimal plan is. Therefore, discretion rather than rules may be the optimal plan in social choice settings.