Bridging Human Expertise and AI
Evaluating the Role of Large Language Models in Retail Investors' Decision-Making
DOI:
https://doi.org/10.20525/ijfbs.v14i1.3910Keywords:
LLM, Large Lannguage Models, Retail Investors, InvestmentsAbstract
This study investigates the role of large language models (LLMs) in retail investors (RIs) decision-making processes from the perspective of the Theory of Planned Behaviour (TPB). It explores whether LLMs can replace or change the role of financial experts and whether introducing LLMs may lead to more infromed RIs’ decisions. Qualitative interviews were conducted with experienced RIs (n = 8). Secondary data were gathered from YouTube recordings (n = 44). Thematic analysis and Retrieval-Augmented Generation (RAG) methodology was used for data extraction and analysis of the scripts. The findings indicate that while LLMs have the potential to enhance accessibility to expert opinions and provide more informed investment decisions, they are unlikely to replace human experts. RIs show a preference for combining LLM insights with human expertise, recognising the limitations of LLMs in managing complex and nuanced investment information. The study highlights the usefulness of the TPB as a framework for the exploration of the topic. It also introduces a novel research method - advanced data extraction techniques on a vast unstructured dataset.?Results contribute to the understanding of LLMs potential in supporting RIs and confirms the usefulness on the AESTIMA tool for data extraction and analysis.
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References
Adam, A. A., & Shauki, E. R. (2014). Socially responsible investment in Malaysia: Behavioral framework in evaluating investors’ decision making process. Journal of Cleaner Production, 80, 224–240. https://doi.org/10.1016/j.jclepro.2014.05.075
Ajzen, I. (2011). The theory of planned behaviour: Reactions and reflections. Psychology & Health, 26, 1113–1127. https://doi.org/10.1080/08870446.2011.613995
Bikhchandani, S., & Sharma, S. (2000). Herd behavior in financial markets. IMF Staff Papers, 47(3), 279–310. https://doi.org/https;//doi.org/10.2307/3867650
Braun, V., & Clarke, V. (2022). Conceptual and design thinking for thematic analysis. Qualitative Psychology, 9(1), 3.
Campbell, S. D., & Sharpe, S. A. (2009). Anchoring bias in consensus forecasts and its effect on market prices. Journal of Financial and Quantitative Analysis, 44(2), 369–390. https://doi.org/10.1017/S0022109009090127
Cao, H. (2024). Recent advances in text embedding: A Comprehensive Review of Top-Performing Methods on the MTEB Benchmark. arXiv Preprint arXiv:2406.01607.
Cao, Z., & Feinstein, Z. (2024). Large Language Model in Financial Regulatory Interpretation. arXiv Preprint arXiv:2405.06808.
Chen, Z. Z., Ma, J., Zhang, X., Hao, N., Yan, A., Nourbakhsh, A., Yang, X., McAuley, J., Petzold, L., & Wang, W. Y. (2024). A Survey on Large Language Models for Critical Societal Domains: Finance, Healthcare, and Law. arXiv Preprint arXiv:2405.01769.
Clarke, V., & Braun, V. (2013). Successful qualitative research: A practical guide for beginners. Sage publications ltd.
Daudert, T. (2021). Exploiting textual and relationship information for fine-grained financial sentiment analysis. Knowledge-Based Systems, 230, 107389. https://doi.org/10.1016/j.knosys.2021.107389
Dewi, M. L., & Ronny, R. (2023). The Effect of Theory of Planned Behavior and Customer Relationship Marketing on Mutual Fund Investment Intentions. Jemasi: Jurnal Ekonomi Manajemen Dan Akuntansi, 19(1), 87–102. https://doi.org/10.35449/jemasi.v19i1.653
Dierkes, M., Klos, A., & Langer, T. (2009). Do my friends influence my investment behavior? Evidence from a representative sample of the German population. European Financial Management Association 2010 Annual Meetings, Aarhus, Denmark. https://www.efmaefm.org/0efmameetings/efma%20annual%20meetings/2010-Aarhus%20old/EFMA2010_0335_fullpaper.pdf
EU Artificial Intelligence Act. (2024). https://artificialintelligenceact.eu/
Gamel, J., Bauer, A., Decker, T., & Menrad, K. (2022). Financing wind energy projects: An extended theory of planned behavior approach to explain private households’ wind energy investment intentions in Germany. Renewable Energy, 182, 592–601. https://doi.org/10.1016/j.renene.2021.09.108
Gao, Y., Xiong, Y., Gao, X., Jia, K., Pan, J., Bi, Y., Dai, Y., Sun, J., Guo, Q., Wang, M., & Wang, H. (2024). Retrieval-Augmented Generation for Large Language Models: A Survey (No. arXiv:2312.10997). arXiv. http://arxiv.org/abs/2312.10997
General Data Protection Regulation (GDPR) – Legal Text. (2018). https://gdpr-info.eu/
Gimmelberg, D., Glowacka, M., Belinskiy, A., Korotkii, S., Artamov, V., & Ludviga, I. (n.d.). Use of Large Language Models in the asset management industry – evidence review. Forthcoming.
Gopi, M., & Ramayah, T. (2007). Applicability of theory of planned behavior in predicting intention to trade online: Some evidence from a developing country. International Journal of Emerging Markets, 2(4), 348–360. https://doi.org/10.1108/17468800710824509
Gumasing, M. J. J., & Niro, R. H. A. (2023). Antecedents of Real Estate Investment Intention among Filipino Millennials and Gen Z: An Extended Theory of Planned Behavior. Sustainability, 15(18), 13714. https://doi.org/10.3390/su151813714
Guo, Z., Jiang, G., Zhang, Z., Li, P., Wang, Z., & Wang, Y. (2023). Shai: A large language model for asset management. arXiv Preprint arXiv:2312.14203.
Hadi, M. U., Al-Tashi, Q., Qureshi, R., Shah, A., Muneer, A., Irfan, M., Zafar, A., Shaikh, M., Akhtar, N., Wu, J., & Mirjalili, S. (2023). Large Language Models: A Comprehensive Survey of its Applications, Challenges, Limitations, and Future Prospects. https://doi.org/10.36227/techrxiv.23589741.v1
Huang, L., Yu, W., Ma, W., Zhong, W., Feng, Z., Wang, H., Chen, Q., Peng, W., Feng, X., & Qin, B. (2023). A survey on hallucination in large language models: Principles, taxonomy, challenges, and open questions. arXiv Preprint arXiv:2311.05232.
Islamo?lu, M., Apan, M., & Ayval?, A. (2015). Determination of factors affecting individual investor behaviours: A study on bankers. International Journal of Economics and Financial Issues, 5(2), 531–543.
Keraghel, I., Morbieu, S., & Nadif, M. (2024). Beyond words: A comparative analysis of LLM embeddings for effective clustering. Miliou, I., Piatkowski, N., Papapetrou, P. (Eds) Advances in Intelligent Data Analysis XXII. IDA 2024. Lecture Notes in Computer Science, 14641, 205–216. https://doi.org/10.1007/978-3-031-58547-0_17
Kisaka, S. E. (2014). The Impact of Attitudes towards Saving, Borrowing and Investment on the Capital Accumulation Process in Kenya: An Application of the Theory of Planned Behavior. Research Journal of Finance and Accounting, 5(9), 140–151.
Leslie, D., & Perini, A. M. (2024). Future Shock: Generative AI and the international AI policy and governance crisis. Harvard Data Scence Review, Special Issue 5. https://doi.org/10.1162/99608f92.88b4cc98
Li, Y., Wang, S., Ding, H., & Chen, H. (2023). Large language models in finance: A survey. 374–382. https://doi.org/10.1145/3604237.3626869
Lo, A. W., & Ross, J. (2024). Can ChatGPT plan your retirement?: Generative AI and financial advice. Generative AI and Financial Advice (February 11, 2024).
Ma, F., Lyu, Z., & Li, H. (2024). Can ChatGPT predict Chinese equity premiums? Finance Research Letters, 105631.
Mahalakshmi, T., & Anuradha, N. (2018). Factors affecting Investment decision making & investment performance among individual investors in India. International Journal of Pure and Applied Mathematics, 118(18), 1667–1675.
Malzara, V. R. B., Widyastuti, U., & Buchdadi, A. D. (2023). Analysis of Gen Z’s Green Investment Intention: The Application of Theory of Planned Behavior. Jurnal Dinamika Manajemen Dan Bisnis, 6(2), 63–84. https://doi.org/10.21009/JDMB.06.2.5
Neuendorf, K. A. (2018). Content analysis and thematic analysis. In Advanced research methods for applied psychology (pp. 211–223). Routledge. https://www.taylorfrancis.com/chapters/edit/10.4324/9781315517971-21/content-analysis-thematic-analysis-kimberly-neuendorf
Norisnita, M., & Indriati, F. (2022). Application of Theory of Planned Behavior (TPB) in Cryptocurrency Investment Prediction: A Literature Review. Economics and Business Quarterly Reviews, 5(2), 181–188. https://doi.org/10.31014/aior.1992.05.02.424
Nugraha, B. A., & Rahadi, R. A. (2021). Analysis of Young Generations toward Stock Investment Intention: A Preliminary Study in an Emerging Market. Journal of Accounting and Investment, 22(1), 80–103. https://doi.org/10.18196/jai.v22i1.9606
Nugraha, V. A., & Prasetyaningtyas, S. W. (2023). Analysis of Factors Influencing Investment Intention in Cryptocurrency: A Theory of Planned Behavior (TPB) Approach. Jurnal Ekonomi, 12(02), 541–551. https://ejournal.seaninstitute.or.id/index.php/Ekonomi/article/view/1653
Pahlevi, R. W., & Oktaviani, I. I. (2018). Determinants of Individual Investor Behaviour in Stock Investment Decisions. Accounting and Financial Review, 1(2), 53–61. https://doi.org/10.26905/afr.v1i2.2427
Patil, S., & Bagodi, V. (2021). A study of factors affecting investment decisions in India: The KANO way. Asia Pacific Management Review, 26(4), 197–214. https://doi.org/10.1016/j.apmrv.2021.02.004
Petro?anu, D.-M., Pîrjan, A., & T?bu?c?, A. (2023). Tracing the Influence of Large Language Models across the Most Impactful Scientific Works. Electronics, 12(24), 4957. https://doi.org/10.3390/electronics12244957
Petukhova, A., Matos-Carvalho, J. P., & Fachada, N. (2024). Text clustering with LLM embeddings. arXiv Preprint arXiv:2403.15112.
Pham, Q. T., Phan, H. H., Cristofaro, M., Misra, S., & Giardino, P. L. (2021). Examining the Intention to Invest in Cryptocurrencies: An Extended Application of the Theory of Planned Behavior on Italian Independent Investors. International Journal of Applied Behavioral Economics (IJABE), 10(3), 59–79. https://doi.org/10.4018/IJABE.2021070104
Piyumini, T. B., & Wijethunga, A. W. G. C. N. (2020). Effect of investors’ psychology on capital market investment: An application of the theory of planned behavior. Journal of Management Matters, 7(1), 1–10. http://repository.rjt.ac.lk/handle/123456789/5037
Porsdam Mann, S., Vazirani, A. A., Aboy, M., Earp, B. D., Minssen, T., Cohen, I. G., & Savulescu, J. (2024). Guidelines for ethical use and acknowledgement of large language models in academic writing. Nature Machine Intelligence, 6, 1272–1274.
Raiaan, M. A. K, Mukta, M. S. H., K. Fatema, Fahad, N. M., S. Sakib, M. M. J. Mim, J. Ahmad, M. E. Ali, & S. Azam. (2024). A Review on Large Language Models: Architectures, Applications, Taxonomies, Open Issues and Challenges. IEEE Access, 12, 26839–26874. https://doi.org/10.1109/ACCESS.2024.3365742
Rooh, S., El-Gohary, H., Khan, I., Alam, S., & Shah, S. M. A. (2023). An Attempt to Understand Stock Market Investors’ Behaviour: The Case of Environmental, Social, and Governance (ESG) Forces in the Pakistani Stock Market. Journal of Risk and Financial Management, 16(12). Scopus. https://doi.org/10.3390/jrfm16120500
Sari, R., Kusnanto, K., & Aswindo, M. (2022). Determinants of Stock Investment Decision Making: A Study on Investors in Indonesia. Golden Ratio of Finance Management, 2(2), 120–131. https://doi.org/10.52970/grfm.v2i2.174
Schifter, D. E., & Ajzen, I. (1985). Intention, perceived control, and weight loss: An application of the theory of planned behavior. Journal of Personality and Social Psychology, 49(3), 843–851. https://doi.org/10.1037/0022-3514.49.3.843
Setyorini, N., & Indriasari, I. (2020). Does millennials have an investment interest? Theory of planned behaviour perspective. Diponegoro International Journal of Business, 3(1), 28–35. https://doi.org/1597077849
Sharma, M., & Gupta, S. (2011). Role of Subjective Norm in Investment Decision Making of Casual Investors. Indian Journal of Finance, 5(11), 39–46. http://gnanaganga.inflibnet.ac.in:8080/jspui/handle/123456789/8005
Shefrin, H., & Statman, M. (2000). Behavioral portfolio theory. Journal of Financial and Quantitative Analysis, 35(2), 127–151. https://doi.org/doi:10.2307/2676187
Subramanian, Y. R. (2021). Social-Media Influence on the Investment Decisions Among the Young Adults in India. Advancement in Management and Technology (AMT), 2(1), 17–26. https://doi.org/10.46977/apjmt.2021v02i01.003
Sun, L., Huang, Y., Wang, H., Wu, S., Zhang, Q., Gao, C., Huang, Y., Lyu, W., Zhang, Y., Li, X., Liu, Z., Liu, Y., Wang, Y., Zhang, Z., Kailkhura, B., Xiong, C., Xiao, C., Li, C., Xing, E., … Zhao, Y. (2024). TrustLLM: Trustworthiness in Large Language Models (No. arXiv:2401.05561). arXiv. http://arxiv.org/abs/2401.05561
Vaismoradi, M., Jones, J., Turunen, H., & Snelgrove, S. (2016). Theme development in qualitative content analysis and thematic analysis. Journal of Nursing Education and Practice, 6, 100–110. https://doi.org/10.5430/jnep.v6n5p100
Widyastuti, U., Febrian, E., Sutisna, S., & Fitrijanti, T. (2023). Could the Theory of Planned Behaviour Explain Market Discipline in Sharia Mutual Funds? Australasian Accounting, Business and Finance Journal, 17(4), 3–20. Scopus. https://doi.org/10.14453/aabfj.v17i4.02
Yeo, K. H. K., Lim, W. M., & Yii, K.-J. (2023). Financial planning behaviour: A systematic literature review and new theory development. Journal of Financial Services Marketing. Scopus. https://doi.org/10.1057/s41264-023-00249-1
Yu, W. (2022). Retrieval-augmented generation across heterogeneous knowledge. Proceedings of the 2022 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies: Student Research Workshop, 52–58. https://doi.org/10.18653/v1/2022.naacl-srw.7
Yulandreano, E., & Rita, M. R. (2023). Investment Decisions on the Crowdfunding Platform Based on the Theory of Planned Behavior. Jurnal Manajemen Bisnis, 14(1), 36–52. https://doi.org/10.18196/mb.v14i1.16494
Zhao, P., Zhang, H., Yu, Q., Wang, Z., Geng, Y., Fu, F., Yang, L., Zhang, W., & Cui, B. (2024). Retrieval-augmented generation for ai-generated content: A survey. arXiv Preprint arXiv:2402.19473.
Zhao, X., Lu, J., Deng, C., Zheng, C., Wang, J., Chowdhury, T., Yun, L., Cui, H., Xuchao, Z., & Zhao, T. (2023). Domain specialization as the key to make large language models disruptive: A comprehensive survey. arXiv Preprint arXiv:2305.18703. https://www.researchgate.net/profile/Chen-Ling-30/publication/371163915_Domain_Specialization_as_the_Key_to_Make_Large_Language_Models_Disruptive_A_Comprehensive_Survey/links/64c805568b5de83215d9fc39/Domain-Specialization-as-the-Key-to-Make-Large-Language-Models-Disruptive-A-Comprehensive-Survey.pdf.
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Copyright (c) 2025 Dmitrii Gimmelberg, Marta Glowacka , Alexey Belinskiy, Sergei Korotkii, Valentin Artamov, Iveta Ludviga

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