本研究旨在探討 2014 年至 2024 年間，台灣全體上市櫃公司內部現金流與外部股權融資對研發支出的驅動效果，並進一步針對高科技產業進行子樣本的深入比較。儘管過往以美國市場為主的經典文獻主張，年輕公司的創新高度依賴外部股權市場的狂熱，但此外部股權驅動創新機制是否適用於台灣市場仍有待商榷。本研究運用動態追蹤資料 GMM 模型對台灣整體市場進行實證檢驗，結果發現與美國經驗截然不同的現象，全體上市櫃公司的外部股權對研發支出均呈現顯著的負向影響，且此一負向關聯在年輕的高科技公司中表現得最為強烈。相反地，內部現金流才是支持台灣企業創新的關鍵動能。此發現為融資順位理論提供了實證支持，極高的逆向選擇成本雖迫使企業避免發行新股，但顯著為負的關聯性進一步揭示了排擠效應，顯示外部股權主要被指定用於實體擴廠或償還債務，進而在當期排擠了長期的研發資源。反映出台灣作為散戶主導且資訊不對稱較嚴重的市場，極高的逆向選擇成本迫使企業避免發行新股。
此外，台灣的年輕科技公司展現出高度的研發平滑化（Smoothing）特性，很可能透過集團企業注資或政府補助等獨特生態系來吸收融資衝擊，使其創新動能得以獨立於公開市場波動之外。本研究為台美資本市場結構與企業整體研發決策間的異質性，提供了最穩健的計量證據。

This study investigates the driving effects of internal cash flow and external equity financing on research and development (R&D) expenditures across the entire Taiwan stock market from 2014 to 2024, with an additional in-depth analysis focusing on the high-tech industry. While classic U.S. literature posits that the R&D boom of young firms is heavily fueled by external equity markets, it remains unclear whether this equity-driven innovation mechanism applies to the Taiwan market. Utilizing a dynamic panel GMM model on the full sample of Taiwanese listed companies, this study identifies significant life-cycle and industrial heterogeneity. The empirical results starkly contrast with the U.S. experience: external equity exhibits a highly robust negative impact on R&D expenditures for the overall market, a phenomenon that is particularly pronounced in young high-tech firms. Instead, internal cash flow is the primary driver of innovation. These findings provide support for the Pecking Order Theory ,while prohibitive adverse selection costs force firms to avoid external equity, the significant negative relationship further captures a crowding-out effect, indicating that public equity is primarily earmarked for physical capacity expansion or debt repayment, thereby crowding out long-term R&D resources. Reflecting that in a retail-dominated market with severe information asymmetry, the exorbitant adverse selection costs of issuing new shares force firms to avoid external equity. Furthermore, Taiwanese young tech firms exhibit a high degree of R&D smoothing, likely supported by a unique ecosystem of affiliated business groups and government subsidies, allowing their innovation to remain independent of public capital market volatility. This study provides crucial econometric evidence for the structural differences in capital markets and corporate R&D decisions between Taiwan and the U.S.

Akerlof, George A., The market for "lemons": Quality uncertainty and the market mechanism, The Quarterly Journal of Economics, 84, 488–500, 1970.
Alti, Aydogan, How sensitive is investment to cash flow when financing is frictionless?, The Journal of Finance, 58, 707–722, 2003.
Arellano, Manuel, and Stephen R. Bond, Some specification tests for panel data: Monte Carlo evidence and an application to employment equations, Review of Economic Studies, 58, 277–298, 1991.
Brown, James R., Steven M. Fazzari, and Bruce C. Petersen, Financing innovation and growth: Cash flow, external equity, and the 1990s R&D boom, The Journal of Finance, 64, 1, 151–185, 2009.
Fazzari, Steven M., Glenn R. Hubbard, and Bruce C. Petersen, Financing constraints and corporate investment, Brookings Papers on Economic Activity, 1, 141–195, 1988.
Gilchrist, Simon, and Charles P. Himmelberg, Evidence on the role of cash flow, Journal of Monetary Economics, 36, 541–572, 1995.
Hall, Bronwyn H., Investment and research and development at the firm level: Does the source of financing matter?, Working paper, NBER, 1992.
Himmelberg, Charles P., and Bruce C. Petersen, R&D and internal finance: A panel study of small firms in high-tech industries, Review of Economics and Statistics, 76, 38–51, 1994.
Kaplan, Steven N., and Luigi Zingales, Do investment-cash flow sensitivities provide useful measures of financing constraints?, Quarterly Journal of Economics, 112, 169–215, 1997.
Myers, Stewart C., and Nicholas S. Majluf, Corporate financing and investment decisions when firms have information that investors do not, Journal of Financial Economics, 13, 187–221, 1984.
Oliner, Stephen D., and Glenn D. Rudebusch, Sources of financing hierarchy for business investment, Review of Economics and Statistics, 74, 643–654, 1992.
Chang, Keng-Hao, 2006, Financial Constraints and Firm Investment: Empirical Evidence from Taiwanese Firms, Master's Thesis, National Tsing Hua University. (In Chinese)
Hung, Jung-Hua, Yi-Ping Ku, and Yi-Giun Li, 2008, The Impact of Group Business on R&D Investment-Cash Flow Sensitivity under Financial Constraints, Journal of Financial Studies, 16(3), 47-75. (In Chinese)
Lin, Shih-Sheng, 2003, A Study on the Relationship between Corporate Investment and Cash Flow under Financial Constraints, Master's Thesis, Tunghai University. (In Chinese)
Shen, Chung-Hua, and Chien-An Wang, 2000, Whether Financing Constraint Affects Investment Decisions: Evidence from Taiwan Panel Data, Academia Economic Papers, 28(1), 67-95. (In Chinese)