The Effect of Heuristics (Anchoring Availability) and Risk Tolerance on Portopolio Diversifacation with Finansial Planning as a Mediator Gen Z in Surabaya City

Nurul Iman; Elly Yuniar Nitawati

Authors

Nurul Iman Universitas Bhayangkara Surabaya
Elly Yuniar Nitawati Universitas Bhayangkara Surabaya

Keywords:

Behavioral finance, Heuristics, Risk tolerance, Financial planning, Portfolio diversification

Abstract

This study examines the behavioral determinants of portfolio diversification among Generation Z investors in Surabaya City, focusing on the role of cognitive biases and financial behavior in shaping investment decisions. In the context of increasing participation of young investors in financial markets, understanding how heuristics and risk preferences influence diversification has become increasingly important. The objective of this research is to analyze the effects of anchoring heuristic, availability heuristic, and risk tolerance on portfolio diversification, with financial planning as a mediating variable. This study employs a quantitative explanatory approach using a cross-sectional survey design. Data were collected through structured questionnaires and analyzed using Partial Least Squares Structural Equation Modeling (PLS-SEM) to examine both direct and indirect relationships among variables. The results indicate that all variables have a significant effect on portfolio diversification, with risk tolerance emerging as the strongest predictor. Financial planning is also found to play a significant mediating role, strengthening the influence of cognitive and behavioral factors on diversification decisions. These findings confirm that investment behavior among Generation Z is influenced not only by rational considerations but also by cognitive biases and structured financial management practices. This study contributes to behavioral finance literature by integrating psychological and behavioral factors into a unified model and provides practical implications for improving financial decision-making through enhanced financial planning and risk awareness.

References

P. Yanida, O. H. Padmanegara, and T. I. Muklis, “The Intention to use Digital Investment Management Platforms Among Gen Z in Indonesia: Perspective from Individual and Technological Motives,” J. Econ. Financ. Manag. Stud., vol. 08, no. 01, pp. 17–30, 2025, doi: 10.47191/jefms/v8-i1-02.

M. M. Desda, M. Yuliza, S. Satriadi, R. Desiyanti, V. Febianni, and D. Dini, “Investment Decisions of Generations Y and Z With Financial Literacy as a Moderation Variable in the Era of Digitalization,” Marg. J. Manag. Account. Gen. Financ. Int. Econ. Issues, vol. 4, no. 2, pp. 243–251, 2025, doi: 10.55047/marginal.v4i2.1595.

N. K. T. S and S. Mayya, “The Impact of Social Media on Investors’ Decision-Making in the Stock Market: A Case Study of Angel Broking Users in Tumkur,” Int. J. Multidiscip. Res., vol. 6, no. 3, pp. 1–11, 2024, doi: 10.36948/ijfmr.2024.v06i03.23550.

Nurul Aisyah, Isroni Isroni, and Rani Suryani, “Behavioral Finance in the Digital Age: How Social Media Influences Investment Decisions,” J. Akuntansi, Ekon. dan Manaj. Bisnis, vol. 5, no. 1, pp. 347–354, 2025, doi: 10.55606/jaemb.v5i1.6519.

P. S. Kasoga, “Heuristic biases and investment decisions: multiple mediation mechanisms of risk tolerance and financial literacy—a survey at the Tanzania stock market,” J. Money Bus., vol. 1, no. 2, pp. 102–116, 2021, doi: 10.1108/jmb-10-2021-0037.

J. Jain, N. Walia, H. Singla, S. Singh, K. Sood, and S. Grima, “Heuristic Biases as Mental Shortcuts to Investment Decision-Making: A Mediation Analysis of Risk Perception,” Risks, vol. 11, no. 4, pp. 1–22, 2023, doi: 10.3390/risks11040072.

H. H. Khan, I. Naz, F. Qureshi, and A. Ghafoor, “Heuristics and stock buying decision: Evidence from Malaysian and Pakistani stock markets,” Borsa Istanbul Rev., vol. 17, no. 2, pp. 97–110, 2017, doi: 10.1016/j.bir.2016.12.002.

R. Bondia, P. C. Biswal, and A. Panda, “The unspoken facets of buying by individual investors in Indian stock market,” Rev. Behav. Financ., vol. 11, no. 3, pp. 324–351., 2019, doi: 10.1108/RBF-12-2017-0121.

Y. Bayar, H. F. Sezgin, Ö. F. Öztürk, and M. Ü. Şaşmaz, “Financial Literacy and Financial Risk Tolerance of Individual Investors: Multinomial Logistic Regression Approach,” SAGE Open, vol. 10, no. 3, 2020, doi: 10.1177/2158244020945717.

A. Omanovic and A. Zaimovic, “The determinants of financial risk tolerance and portfolio allocation: Have the Covid-19 pandemic and the Ukraine war affected our risk tolerance?,” Borsa Istanbul Rev., vol. 24, no. 6, pp. 1381–1392, 2024, doi: 10.1016/j.bir.2024.11.001.

O. Onishchenko, J. Zhao, S. Kongahawatte, and D. Kuruppuarachchi, “Investor heterogeneity and anchoring-induced momentum,” J. Behav. Exp. Financ., vol. 42, p. 100926, 2024, doi: 10.1016/j.jbef.2024.100926.

Ç. Hamurcu, A. Hazar, and Ş. Babuşcu, “A portfolio-focused behavioral model linking financial literacy and risk tolerance: Evidence from mutual fund investors in Türkiye,” Borsa Istanbul Rev., vol. 25, no. September, pp. 119–127, 2025, doi: 10.1016/j.bir.2025.09.001.

R. Godase, J. P, and M. L. Supriya, “Financial planning propensity in working adults: exploring the role of media,” Manag. Financ., vol. 50, no. 2, pp. 313–328, 2024, doi: 10.1108/MF-04-2023-0253.

H.-M. Von Gaudecker, “How Does Household Portfolio Diversification Vary with Financial Literacy and Financial Advice?,” J. Finance, vol. 70, pp. 489–507, 2015, doi: 10.1111/jofi.12231.

S. Barone, N. Oggero, and M. Damilano, “Financial literacy and international portfolio diversification,” Int. Rev. Econ. Financ., vol. 105, no. December 2025, p. 104876, 2026, doi: 10.1016/j.iref.2025.104876.

J. E. Grable and A. Rabbani, “The Moderating Effect of Financial Knowledge on Financial Risk Tolerance,” J. Risk Financ. Manag., vol. 16, no. 2, p. 137, 2023, doi: 10.3390/jrfm16020137.

T. B. Fateye, R. B. Peiser, and C. A. Ajayi, “Behavioral factors influencing investment decision-making in the Nigerian real estate stock market,” Sci. African, vol. 24, no. January, p. e02238, 2024, doi: 10.1016/j.sciaf.2024.e02238.

A. Rabbani, J. E. Grable, A. Woodyard, and Z. Yao, “Describing investor profiles: A test of the associations among financial knowledge, confidence, and help and information source.,” Financ. Serv. Rev., vol. 27, no. 3, pp. 209–230, 2018, doi: 10.61190/fsr.v27i3.3395.