Abstract

In many democratic parliamentary systems, election timing is an important decision availed to governments according to sovereign political systems. Prudent governments can take advantage of this constitutional option in order to maximize their expected remaining life in power. The problem of establishing the optimal time to call an election based on observed poll data has been well studied with several solution methods and various degrees of modeling complexity. The derivation of the optimal exercise boundary holds strong similarities with the American option valuation problem from mathematical finance. A seminal technique refined by Longstaff and Schwartz in 2001 provided a method to estimate the exercise boundary of the American options using a Monte Carlo method and a least squares objective. In this paper, we modify the basic technique to establish the optimal exercise boundary for calling a political election. Several innovative adaptations are required to make the method work with the additional complexity in the electoral problem. The transfer of Monte Carlo methods from finance to determine the optimal exercise of real-options appears to be a new approach.

Highlights

  • This paper is concerned with a new approach for establishing the optimal decision criteria for calling an early election within an electoral environment which permits a government such an option

  • Unlike the typical American Option problem in finance, when the option holder the government exercises the option calls an early election, the payoff is not known with certainty

  • In this paper we have developed adaptations of a technique which has proven to be successful in financial engineering and applied it to find the optimal exercise boundary in the early political election problem

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Summary

Introduction

This section develops the algorithm for establishing the value function and the optimal exercise boundary by modifying the Longstaff-Schwartz method. We term it the Modified Longstaff-Schwartz MLS method, as adapted for the optimal election exercise problem. The main stages in the MLS algorithm are described here. The details on each individual component are explained in the subsections. The solution space is discretised {t0, t1, . TM} ⊂ 0, Y in time over with spaced intervals. A number of simulations N is selected for the algorithm

Problem Formulation and Notation
Poll Process
Sampling and Response Error
Calibration of the Poll Process and Winning Probabilities
Summary
Simulations of the Poll Trajectory
Value Function and the Optimality Principle
Simulation of the Exercise Decision
Regression Process
Selection of the Initial Value
Sample Trajectories
Convergence Behaviour
Call Exercise Boundary
Value Function
Conclusions and Future Work

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