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Value of investors’ escalation of commitment in PPP projects using real option thinking

    Ruolan Gao Affiliation
    ; Jicai Liu   Affiliation

Abstract

Escalation of commitment (EOC) is a common behavior among investors who receive negative feedback (NF) in public-private partnership (PPP) projects, and this behavior typically leads to sizable losses. Recognizing this, investors set a mental threshold and track investments for escalation. Once losses reach the threshold, investors will terminate the escalation behavior, namely, they will transfer projects to governments to obtain compensation or residual asset value. This paper analyzes the maximum amount of NF that investors can sustain based on a belief-adjustment model, followed by the analysis of the greatest loss degree. Then, a threshold model for EOC is constructed using real option thinking. Different from the usual judgment criteria of the traditional option method, the threshold is less than zero in the EOC scenario. The results show that the threshold correlates with the initial generative cognition, the sunk cost level, the degree of the government guarantee and investors’ behavioral preferences as well as with total investment and return on investment. These findings serve as a reference for governments to de-escalate investors’ commitment in PPP projects.

Keyword : public-private partnership project, escalation of commitment, real option theory, threshold, abandonment option, early termination pricing

How to Cite
Gao, R., & Liu, J. (2020). Value of investors’ escalation of commitment in PPP projects using real option thinking. International Journal of Strategic Property Management, 24(5), 348–364. https://doi.org/10.3846/ijspm.2020.13120
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References

Almassi, A., McCabe, B., & Thompson, M. (2012). Real optionsbased approach for valuation of government guarantees in public-private partnerships. Journal of Infrastructure Systems, 19(2), 196−204. https://doi.org/10.1061/(ASCE)IS.1943-555X.0000117

Aretz, K., & Pope, P. F. (2018). Real options models of the firm, capacity overhang, and the cross section of stock returns. Journal of Finance, 73(3), 1363−1415.
https://doi.org/10.1111/jofi.12617

Ashuri, B., Kashani, H., Molenaar, K. R., Lee, S., & Lu, J. (2011). Risk-neutral pricing approach for evaluating BOT highway projects with government minimum revenue guarantee options. Journal of Construction Engineering and Management, 138(4), 545−557. https://doi.org/10.1061/(ASCE)CO.1943-7862.0000447

Attarzadeh, M., Chua, D. K., Beer, M., & Abbott, E. L. (2017). Options-based negotiation management of PPP-BOT infrastructure projects. Construction Management and Economics, 35(11−12), 676−692.
https://doi.org/10.1080/01446193.2017.1325962

Berg, J. E., Dickhaut, J. W., & Kanodia, C. (2009). The role of information asymmetry in escalation phenomena: empirical evidence. Journal of Economic Behavior and Organization, 69(2), 135−147. https://doi.org/10.1016/j.jebo.2007.07.007

Biygautane, M., Neesham, C., & Al-Yahya, K. O. (2019). Institutional entrepreneurship and infrastructure public-private partnership (PPP): unpacking the role of social actors in implementing PPP projects. International Journal of Project Management, 37(1), 192−219.
https://doi.org/10.1016/j.ijproman.2018.12.005

Bloom, N. (2009). The impact of uncertainty shocks. Econometrica, 77(3), 623−685. https://doi.org/10.3982/ECTA6248

Bobocel, D. R., & Meyer, J. P. (1994). Escalating commitment to a failing course of action: separating the roles of choice and justification. Journal of Applied Psychology, 79(3), 360−363. https://doi.org/10.1037/0021-9010.79.3.360

Boulding, W., Guha, A., & Staelin, R. (2016). Do we really need to change the decision maker? Counterintuitive escalation of commitment results in real options contexts. Management Science, 63(10), 3459−3472.
https://doi.org/10.1287/mnsc.2016.2475

Brandão, L. E., Bastian-Pinto, C., Gomes, L. L., & Labes, M. (2012). Government supports in public-private partnership contracts: Metro Line 4 of the Sao Paulo Subway System. Journal of Infrastructure Systems, 18(3), 218−225.
https://doi.org/10.1061/(ASCE)IS.1943-555X.0000095

Brockner, J. (1992). The escalation of commitment to a failing course of action: toward theoretical progress. Academy of Management Review, 17(1), 39−61.
https://doi.org/10.5465/amr.1992.4279568

Brouthers, K. D., & Dikova, D. (2010). Acquisitions and real options: the greenfield alternative. Journal of Management Studies, 47(6), 1048−1071. https://doi.org/10.1111/j.1467-6486.2009.00875.x

Buyukyoran, F., & Gundes, S. (2018). Optimized real optionsbased approach for government guarantees in PPP toll road projects. Construction Management and Economics, 36(4), 203−216. https://doi.org/10.1080/01446193.2017.1347267

Carbonara, N., & Pellegrino, R. (2018). Revenue guarantee in public–private partnerships: a win–win model. Construction Management and Economics, 36(10), 584−598.
https://doi.org/10.1080/01446193.2018.1467028

Carbonara, N., & Pellegrino, R. (2019). The role of public private partnerships in fostering innovation. Construction Management and Economics, 38(2), 140–1561.
https://doi.org/10.1080/01446193.2019.1610184

Chung, S. H., & Cheng, K. C. (2018). How does cognitive dissonance influence the sunk cost effect? Psychology Research and Behavior Management, 11, 37–45.
https://doi.org/10.2147/PRBM.S150494

Collan, M., Haahtela, T., & Kyläheiko, K. (2016). On the usability of real option valuation model types under different types of uncertainty. International Journal of Business Innovation and Research, 11(1), 18–37. https://doi.org/10.1504/IJBIR.2016.077608

Cruz, C. O., & Marques, R. C. (2013). Flexible contracts to cope with uncertainty in public-private partnerships. International Journal of Project Management, 31(3), 473–483.
https://doi.org/10.1016/j.ijproman.2012.09.006

Dahan, E., & Mendelson, H. (2001). An extreme-value model of concept testing. Management Science, 47(1), 102–116. https://doi.org/10.1287/mnsc.47.1.102.10666

Drummond, H. (2014). Escalation of commitment: when to stay the course? Academy of Management Perspectives, 28(4), 430–446. https://doi.org/10.5465/amp.2013.0039

Feldman, G., & Wong, K. F. E. (2018). When action-inaction framing leads to higher escalation of commitment: a new inaction-effect perspective on the sunk-cost fallacy. Psychological Science, 29(4), 537–548.
https://doi.org/10.1177/0956797617739368

Feng, Z., Zhang, S. B., & Gao, Y. (2015). Modeling the impact of government guarantees on toll charge, road quality and capacity for Build-Operate-Transfer (BOT) road projects. Transportation Research Part A: Policy and Practice, 78, 54–67. https://doi.org/10.1016/j.tra.2015.05.006

Festinger, L. (1962). A theory of cognitive dissonance (Vol. 2). Stanford University Press.

Galera, A. L. L., & Soliño, A. S. (2010). A real options approach for the valuation of highway concessions. Transportation Science, 44(3), 416–427. https://doi.org/10.1287/trsc.1090.0299

Garvin, M. J., & Ford, D. N. (2012). Real options in infrastructure projects: theory, practice and prospects. Engineering Project Organization Journal, 2(1–2), 97–108.
https://doi.org/10.1080/21573727.2011.632096

Guo, K., Zhang, L., & Wang, T. (2019). Optimal scheme in energy performance contracting under uncertainty: a real option perspective. Journal of Cleaner Production, 231, 240–253. https://doi.org/10.1016/j.jclepro.2019.05.218

Hafenbrädl, S., & Woike, J. K. (2018). Competitive escalation and interventions. Journal of Behavioral Decision Making, 31(5), 695–714. https://doi.org/10.1002/bdm.2084

Heath, C. (1995). Escalation and de-escalation of commitment in response to sunk costs: the role of budgeting in mental accounting. Organizational Behavior and Human Decision Processes, 62(1), 38–54. https://doi.org/10.1006/obhd.1995.1029

Herder, P. M., de Joode, J., Ligtvoet, A., Schenk, S., & Taneja, P. (2011). Buying real options-valuing uncertainty in infrastructure planning. Futures, 43(9), 961–969.
https://doi.org/10.1016/j.futures.2011.06.005

Hogarth, R. M., & Einhorn, H. J. (1992). Order effects in belief updating: the belief-adjustment model. Cognitive Psychology, 24(1), 1–55. https://doi.org/10.1016/0010-0285(92)90002-J

Hsieh, K. Y., Tsai, W., & Chen, M. J. (2015). If they can do it, why not us? Competitors as reference points for justifying escalation of commitment. Academy of Management Journal, 58(1), 38–58. https://doi.org/10.5465/amj.2011.0869

Iossa, E., Spagnolo, G., & Vellez, M. (2007). Best practices on contract design in public-private partnerships (Working Paper). World Bank.

Jani, A. (2008). An experimental investigation of factors influencing perceived control over a failing IT project. International Journal of Project Management, 26(7), 726–732. https://doi.org/10.1016/j.ijproman.2008.06.004

Jani, A. (2011). Escalation of commitment in troubled IT projects: influence of project risk factors and self-efficacy on the perception of risk and the commitment to a failing project. International Journal of Project Management, 29(7), 934–945. https://doi.org/10.1016/j.ijproman.2010.08.004

Jeong, J., Ji, C., Hong, T., & Park, H. S. (2015). Model for evaluating the financial viability of the BOT project for highway service areas in South Korea. Journal of Management in Engineering, 32(2), 04015036.
https://doi.org/10.1061/(ASCE)ME.1943-5479.0000396

Kahneman, D., & Tversky, A. (1979). Prospect theory: an analysis of decision under risk. Econometrica: Journal of the Econometric Society, 263–291.
https://doi.org/10.1142/9789814417358_0006

Karlsson, N., Gärling, T., & Bonini, N. (2005). Escalation of commitment with transparent future outcomes. Experimental Psychology, 52(1), 67–73. https://doi.org/10.1027/1618-3169.52.1.67

Keil, M., Rai, A., Mann, J. C., & Zhang, G. P. (2003). Why software projects escalate: the importance of project management constructs. IEEE Transactions on Engineering Management, 50(3), 251–261. https://doi.org/10.1109/TEM.2003.817312

Keil, M., Tan, B. C., Wei, K. K., Saarinen, T., Tuunainen, V., & Wassenaar, A. (2000). A cross-cultural study on escalation of commitment behavior in software projects. MIS Quarterly, 24(2), 299–325. https://doi.org/10.2307/3250940

Keil, M., Truex, D. P., & Mixon, R. (1995). The effects of sunk cost and project completion on information technology project escalation. IEEE Transactions on Engineering Management, 42(4), 372–381. https://doi.org/10.1109/17.482086

Kiesler, C. A. (1971). The psychology of commitment: experiments linking behavior to belief. Academic Press.
Krüger, N. A. (2012). To kill a real option–incomplete contracts, real options and PPP. Transportation Research Part A: Policy and Practice, 46(8), 1359–1371. https://doi.org/10.1016/j.tra.2012.04.009

Ku, G., Malhotra, D., & Murnighan, J. K. (2005). Towards a competitive arousal model of decision-making: a study of auction fever in live and Internet auctions. Organizational Behavior and Human Decision Processes, 96(2), 89–103.
https://doi.org/10.1016/j.obhdp.2004.10.001

Lee, J. S., Keil, M., & Wong, K. F. E. (2018). Does a tired mind help avoid a decision bias? The effect of ego depletion on escalation of commitment. Applied Psychology, 67(1), 171–185. https://doi.org/10.1111/apps.12109

Li, S., Abraham, D., & Cai, H. (2017). Infrastructure financing with project bond and credit default swap under public-private partnerships. International Journal of Project Management, 35(3), 406–419. https://doi.org/10.1016/j.ijproman.2017.01.005

Liu, J., Gao, R., & Cheah, Y. J. (2017). Pricing mechanism of early termination of PPP projects based on real option theory. Journal of Management in Engineering, 33(6), 04017035.
https://doi.org/10.1061/(ASCE)ME.1943-5479.0000556

Liu, J., Liu, J., Gao, R., Gao, H. O., & Li, Y. (2019a). Identifying project factors that affect an investor’s escalation of commitment in public-private partnership projects. Project Management Journal, 50(6), 686–698.
https://doi.org/10.1177/8756972819847874

Liu, J., Yu, X., & Cheah, C. Y. J. (2014). Evaluation of restrictive competition in PPP projects using real option approach. International Journal of Project Management, 32(3), 473–481. https://doi.org/10.1016/j.ijproman.2013.07.007

Liu, S., Jin, H., Liu, C., Xie, B., & Mills, A. (2019b). Government compensation and costs of non-competition guarantee for PPP rental retirement villages. Engineering, Construction and Architectural Management, 27(1), 128–149. https://doi.org/10.1108/ECAM-01-2019-0063

Martins, J., Marques, R. C., & Cruz, C. O. (2013). Real options in infrastructure: revisiting the literature. Journal of Infrastructure Systems, 21(1), 04014026. https://doi.org/10.1061/(ASCE)IS.1943-555X.0000188

Marzouk, M., & Ali, M. (2018). Mitigating risks in wastewater treatment plant PPPs using minimum revenue guarantee and real options. Utilities Policy, 53, 121–133. https://doi.org/10.1016/j.jup.2018.06.012

McCain, B. E. (1986). Continuing investment under conditions of failure: a laboratory study of the limits to escalation. Journal of Applied Psychology, 71(2), 280–284. http://doi.org/10.1037/0021-9010.71.2.280

Montealegre, R., & Keil, M. (2000). De-escalating information technology projects: lessons from the Denver International Airport. MIS Quarterly, 24(3), 417–447. http://doi.org/10.2307/3250968

Moon, H. (2001). Looking forward and looking back: integrating completion and sunk-cost effects within an escalation-ofcommitment progress decision. Journal of Applied Psychology, 86(1), 104–113. https://doi.org/10.1037//0021-9010.86.1.104

Moon, H., Conlon, D. E., Humphrey, S. E., Quigley, N., Devers, C. E., & Nowakowski, J. M. (2003a). Group decision process and incrementalism in organizational decision making. Organizational Behavior and Human Decision Processes, 92(1–2), 67–79. https://doi.org/10.1016/S0749-5978(03)00079-7

Moon, H., Hollenbeck, J. R., Humphrey, S. E., & Maue, B. (2003b). The tripartite model of neuroticism and the suppression of depression and anxiety within an escalation of commitment dilemma. Journal of Personality, 71(3), 347–368. https://doi.org/10.1111/1467-6494.7103004

Morreale, A., Robba, S., Nigro, G. L., & Roma, P. (2017). A real options game of alliance timing decisions in biopharmaceutical research and development. European Journal of Operational Research, 261(3), 1189–1202.
https://doi.org/10.1016/j.ejor.2017.03.025

Nunes, C., & Pimentel, R. (2017). Analytical solution for an investment problem under uncertainties with shocks. European Journal of Operational Research, 259(3), 1054–1063.
https://doi.org/10.1016/j.ejor.2017.01.008

Oh, H., & Yoon, C. (2020). Time to build and the real-options channel of residential investment. Journal of Financial Economics, 135(1), 255–269. https://doi.org/10.1016/j.jfineco.2018.10.019

Osei-Kyei, R., & Chan, A. P. (2018). Stakeholders’ perspectives on the success criteria for public-private partnership projects. International Journal of Strategic Property Management, 22(2), 131–142. ttps://doi.org/10.3846/ijspm.2018.444

Pan, G., & Pan, S. L. (2011). Transition to IS project de-escalation: an exploration into management executives’ influence behaviors. IEEE Transactions on Engineering Management, 58(1), 109–123. https://doi.org/10.1109/TEM.2010.2048908

Pan, G., Pan, S. L., & Newman, M. (2009). Managing information technology project escalation and de-escalation: an approach-avoidance perspective. IEEE Transactions on Engineering Management, 56(1), 76–94.
https://doi.org/10.1109/TEM.2008.922638

Pan, S. L., Pan, G. S., Newman, M., & Flynn, D. (2006). Escalation and de-escalation of commitment to information systems projects: insights from a project evaluation model. European Journal of Operational Research, 173(3), 1139–1160. https://doi.org/10.1016/j.ejor.2005.07.009

Pellegrino, R., Carbonara, N., & Costantino, N. (2019). Public guarantees for mitigating interest rate risk in PPP projects. Built Environment Project and Asset Management, 9(2), 248–261. https://doi.org/10.1108/BEPAM-01-2018-0012

Ross, J., & Staw, B. M. (1993). Organizational escalation and exit: lessons from the Shoreham nuclear power plant. Academy of Management Journal, 36(4), 701–732.
https://doi.org/10.5465/256756

Rutten, M. E., Dorée, A. G., & Halman, J. I. (2014). Together on the path to construction innovation: yet another example of escalation of commitment? Construction Management and Economics, 32(7–8), 695–704.
https://doi.org/10.1080/01446193.2014.933855

Sarangee, K. R., Schmidt, J. B., & Calantone, R. J. (2019). Anticipated regret and escalation of commitment to failing, new product development projects in business markets. Industrial Marketing Management, 76, 157–168.
https://doi.org/10.1016/j.indmarman.2018.08.008

Schaumberg, R. L., & Wiltermuth, S. S. (2014). Desire for a positive moral self-regard exacerbates escalation of commitment to initiatives with prosocial aims. Organizational Behavior and Human Decision Processes, 123(2), 110–123. https://doi.org/10.1016/j.obhdp.2013.10.012

Sleesman, D. J., Conlon, D. E., McNamara, G., & Miles, J. E. (2012). Cleaning up the big muddy: a meta-analytic review of the determinants of escalation of commitment. Academy of Management Journal, 55(3), 541–562.
https://doi.org/10.5465/amj

Sleesman, D. J., Lennard, A. C., McNamara, G., & Conlon, D. E. (2018). Putting escalation of commitment in context: a multilevel review and analysis. Academy of Management Annals, 12(1), 178–207. https://doi.org/10.5465/annals.2016.0046

Song, J., Song, D., & Zhang, D. (2015). Modeling the concession period and subsidy for B waste-to-energy incineration projects. Journal of Construction Engineering and Management, 141(10), 04015033. https://doi.org/10.1061/(ASCE)CO.1943-7862.0001005

Song, J., Hu, Y., & Feng, Z. (2018). Factors influencing early termination of PPP projects in China. Journal of Management in Engineering, 34(1), 05017008.
https://doi.org/10.1061/(ASCE)ME.1943-5479.0000572

Staats, B. R., Kc, D. S., & Gino, F. (2018). Maintaining beliefs in the face of negative news: the moderating role of experience. Management Science, 64(2), 804–824.
https://doi.org/10.1287/mnsc.2016.2640

Staw, B. M. (1976). Knee-deep in the big muddy: a study of escalating commitment to a chosen course of action. Organizational Behavior and Human Performance, 16(1), 27–44. https://doi.org/10.1016/0030-5073(76)90005-2

Staw, B. M. (1981). The escalation of commitment to a course of action. Academy of Management Review, 6(4), 577–587. https://doi.org/10.5465/amr.1981.4285694

Staw, B. M., & Ross, J. (1987). Behavior in escalation situations: antecedents, prototypes and solutions. Research in Organizational Behavior, 9(4), 39–78. https://doi.org/10.1108/eb055578

Staw, B. M., & Ross, J. (1989). Understanding behavior in escalation situations. Science, 246(4927), 216–220.
https://doi.org/10.1126/science.246.4927.216

Tan, B. C., Smith, H. J., Keil, M., & Montealegre, R. (2003). Reporting bad news about software projects: impact of organizational climate and information asymmetry in an individualistic and a collectivistic culture. IEEE Transactions on Engineering Management, 50(1), 64–77.
https://doi.org/10.1109/TEM.2002.808292

Tang, Y., & Liu, Z. (2008). Decision responsibility, generative cognition, escalation of commitment in capital budgeting decision: an experimental research based on role-playing experiments. Nankai Business Review, (1), 45–48.

Triantis, A. (2005). Realizing the potential of real options: does theory meet practice? Journal of Applied Corporate Finance, 17(2), 8–16. https://doi.org/10.1111/j.1745-6622.2005.00028.x

Trigeorgis, L., & Tsekrekos, A. E. (2018). Real options in operations research: a review. European Journal of Operational Research, 270(1), 1–24.
https://doi.org/10.1016/j.ejor.2017.11.055

Tversky, A., & Kahneman, D. (1992). Advances in prospect theory: cumulative representation of uncertainty. Journal of Risk and Uncertainty, 5(4), 297–323.
https://doi.org/10.1007/BF00122574

Valipour, A., Yahaya, N., Noor, N. M., Valipour, I., & Tamošaitienė, J. (2019). A SWARA-COPRAS approach to the allocation of risk in water and sewerage public-private partnership projects in Malaysia. International Journal of Strategic Property Management, 23(4), 269–283.
https://doi.org/10.3846/ijspm.2019.8066

Villani, E., Greco, L., & Phillips, N. (2017). Understanding value creation in public-private partnerships: a comparative case study. Journal of Management Studies, 54(6), 876–905.
https://doi.org/10.1111/joms.12270

Vroom, V. (1964). Expectancy theory. Work and motivation. Wiley.

Wang, Y., Cui, P., & Liu, J. (2018). Analysis of the risk-sharing ratio in PPP projects based on government minimum revenue guarantees. International Journal of Project Management, 36(6), 899–909. https://doi.org/10.1016/j.ijproman.2018.01.007

Wang, Y., Gao, H. O., & Liu, J. (2019). Incentive game of investor speculation in PPP highway projects based on the government minimum revenue guarantee. Transportation Research Part A: Policy and Practice, 125, 20–34.
https://doi.org/10.1016/j.tra.2019.05.006

Wang, Y., & Liu, J. (2015). Evaluation of the excess revenue sharing ratio in PPP projects using principal-agent models. International Journal of Project Management, 33(6), 1317–1324. https://doi.org/10.1016/j.ijproman.2015.03.002

Westfall, J. E., Jasper, J. D., & Christman, S. (2012). Inaction inertia, the sunk cost effect, and handedness: avoiding the losses of past decisions. Brain and Cognition, 80(2), 192–200. https://doi.org/10.1016/j.bandc.2012.06.003

Whyte, G. (1986). Escalating commitment to a course of action: a reinterpretation. Academy of Management Review, 11(2), 311–321. https://doi.org/10.5465/amr.1986.4283111

Winch, G. M. (2013). Escalation in major projects: lessons from the Channel Fixed Link. International Journal of Project Management, 31(5), 724–734. https://doi.org/10.1016/j.ijproman.2013.01.012

Wong, K. F. E. (2005). The role of risk in making decisions under escalation situations. Applied Psychology, 54(4), 584–607. https://doi.org/10.1111/j.1464-0597.2005.00236.x

Wong, K. F. E., & Kwong, J. Y. (2007). The role of anticipated regret in escalation of commitment. Journal of Applied Psychology, 92(2), 545–554. https://doi.org/10.1037/0021-9010.92.2.545

Wong, K. F. E., & Kwong, J. Y. (2018). Resolving the judgment and decision-making paradox between adaptive learning and escalation of commitment. Management Science, 64(4), 1911– 1925. https://doi.org/10.1287/mnsc.2016.2686

Wong, K. F. E., Kwong, J. Y. Y., & Ng, C. K. (2008). When thinking rationally increases biases: the role of rational thinking style in escalation of commitment. Applied Psychology, 57(2), 246–271. https://doi.org/10.1111/j.1464-0597.2007.00309.x

Xiong, W., Zhang, X., & Chen, H. (2015). Early-termination compensation in public-private partnership projects. Journal of Construction Engineering and Management, 142(4), 04015098. https://doi.org/10.1061/(ASCE)CO.1943-7862.0001084

Yao, X., Fan, Y., Xu, Y., Zhang, X., Zhu, L., & Feng, L. (2019). Is it worth to invest? - An evaluation of CTL-CCS project in China based on real options. Energy, 182(1), 920–931. https://doi.org/10.1016/j.energy.2019.06.100

Yu, S., Li, Z., Wei, Y. M., & Liu, L. (2019). A real option model for geothermal heating investment decision making: considering carbon trading and resource taxes. Energy, 189, 116252. https://doi.org/10.1016/j.energy.2019.116252

Zapata Quimbayo, C. A., Mejía Vega, C. A., & Marques, N. L. (2019). Minimum revenue guarantees valuation in PPP projects under a mean reverting process. Construction Management and Economics, 37(3), 121–138.
https://doi.org/10.1080/01446193.2018.1500024

Zardkoohi, A. (2004). Do real options lead to escalation of commitment? Academy of Management Review, 29(1), 111–119. https://doi.org/10.5465/amr.2004.11851733

Zhang, G. P., Keil, M., Rai, A., & Mann, J. (2003). Predicting information technology project escalation: a neural network approach. European Journal of Operational Research, 146(1), 115–129.
https://doi.org/10.1016/S0377-2217(02)00294-1