Dynamics Simulation Approach in Analyzing Pension Expenditure

Authors: Hasimah Sapiri, Anton Abdulbasah Kamil, Razman Mat Tahar, Hanafi Tumin

Abstract:

Salary risk and demographic risk have been identified as main risks in analyzing pension expenditure particularly in Defined Benefit pension plan. Therefore, public pension plan in Malaysia is studied to analyze pension expenditure due to salary and demographic risk. Through the literature review and interview session with several officers in public sector, factors affecting pension expenditure are determined. Then, the inter-relationships between these factors are analyzed through causal loop diagram. The System Dynamics model is later developed using iThink software to show how demographic and salary changes affect the pension expenditure. Then, by using actual data, the impact of different policy scenarios on pension expenditure is analyzed. It is shown that dynamics simulation model of pension expenditure is useful to evaluate the impact of changes and policy decisions on risk particularly involving demographic and salary risk.

Keywords: Demographic and Salary risk, Pension Expenditure, Public Policy, System Dynamics.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1061016

References:

[1] Disney, R. and Johnson, P., Pension systems & retirement incomes across OECD countries, Edward Elgar, 2001, pp. 1-3.
[2] Chang, K.W., "A risk management perspective on public pension reform," PhD diss., Boston University, 2000.
[3] Maani, K.E & Cavana, R.Y. Systems Thinking and Modeling, Understanding Change and Complexity, Pearson Education N.Z press, 2000, pp. 16-70.
[4] Chang, S.C., "Optimal pension funding through dynamic simulation: the case of Taiwan public employees retirement system," Insurance, Mathematics & Economics, vol. 24, pp. 187-199,1999.
[5] Chang, S.C and Cheng, Y.H., "Pension valuation under uncertainties: implementation of a stochastic & dynamic monitoring system," The Journal of Risk & Insurance,vol. 69, pp. 171- 192, 2002.
[6] Chaim, R. M., "Combining ALM and System Dynamics in Pension Funds," in online Proc. of the 24th International Refereed Conference of System Dynamics Society, Netherlands, 2006.
[7] Chaim, R. M., "Dynamic stochasticity in the control of liquidity in asset and liability management (ALM) for pension funds," in online Proc. of the 25th International Refereed Conference of System Dynamics Society, Boston,2007.
[8] Jimeno, J.F., Rojas, J.A. and Puente, S., "Modelling the impact of aging on social security expenditures," Economic Modelling, vol. 25, 2008, pp. 201-224.
[9] Shimada, T, Kameyama, S, Uchino, A, Machida, K and Watanabe, M, "Simulation model of Japanese welfare annuity system," in online Proc. of the 8th International Refereed Conference of System Dynamics Society, Chestnut Hill, USA, 1990.
[10] Chaim, R. and Streit, R.E. "Pension funds governance: combining SD, Agent based modeling and fuzzy logic to address Dynamic Asset and Liability Management (ALM) problem," in online Proc. of the 26th International Refereed Conference of System Dynamics, Society, Athens, 2008.