本研究針對台灣股票市場自民國51年2月9日至民國91年12月31日，對股票報酬率與風險溢酬進行實證研究，並且依據Fama與French的方法論，依照台灣發行量加權股價指數(TAIEX)的標準進行資料採樣，以平均股票報酬模式(average stock return model)、股利成長模式(dividend growth model)與盈餘成長模式(earning growth model)來進行估計，研究結果發現台灣股票市場的風險溢酬相較於以美國為主的已開發市場，呈現較高水準的風險溢酬與高度的變異性，此外，在經由變異數調整後，依據基本分析方法(股利成長模式與盈餘成長模式)所衡量的風險溢酬較具一致性，並且股利成長模式為較優秀的風險溢酬估計式，其原因包括其在各個投資期間有較低的標準差，以及在數值上呈現了一致性。 另外，在實質股利成長率與盈餘成長率的預估上，無論是一年期或二年期的預測力都相當低。股利股價比(Dt/Pt)與盈餘股價比(Yt/Pt)在近年呈現下滑的趨勢，根據價值分析理論，暗示未來股票報酬率有可能降低，然而，依據淨值市值比(BE/ME) 效應，則出現與前述推論不一致的結果。 不過，三種模式的風險溢酬皆高於平均收益報酬率A(Yt/Bt-1)，顯示投資報酬率低於資金成本，違反投資淨現值大於零的原則，因此依賴基本分析對台灣這類新興市場進行分析可能存在適用上的問題。為加強對台灣股票市場的解釋，本研究另加入其它觀點與行為財務學角度的解釋，來說明台灣股票市場高風險溢酬與高變異的特性。 / Abstract This thesis is an empirical analysis of the risk premium of Taiwan’s equity market. The sample period covers 1962/2/9 - 2002/12/31. My methodology is based on the average stock return model, dividend growth model, and earning growth model suggested by Fama and French (2002). In contrast to the United States, which is a developed market, my empirical results indicate that Taiwan’s equity market is characterized by high risk premium and high volatility. In addition, fundamental analyses (dividend growth model and earning growth model) yield similar results. But the dividend growth model has the best forecasting ability of the three models because of its high consistency and low variability. The real dividend growth rate and the real earning growth rate have low predictability of one- and two-year growth rates in the future. The Dt/Pt and Yt/Pt ratio decrease in recent years, implying that future equity premium will decrease. However, the BE/ME ratio does not behave similarly. Surprisingly, the equity premium of all three models is grater than the average real income return on book equity. The expected stock return exceeding the expected income return on book equity implies that typical corporate investments have negative net present value. Thus, applying fundamental analysis to an emerging market such as Taiwan may not be suitable. I try to provide sensible explanations for my findings on the Taiwan’s equity market by referencing viewpoints expressed in the behavioral finance literature and other literatures.

已實現投資報酬率與無風險利率之差、被稱為超額報酬，而股票的預期報酬率超過無風險利率的部份則為股票風險溢酬，是許多資產評價模型的重要依據，例如資本資產定價模型。有不同的理論架構解釋說明風險溢酬值，例如；股票風險溢酬的迷思、短期損失的憎惡、生還存留因素和回歸與偏離平均值等等。 研究台灣股市的超額報酬與股票風險溢酬，有助投資大眾和企業理性面對股市的預期報酬和風險，對台股才有合理的期望報酬值。分析1967年迄2003年的台灣金融市場，計算過去37年長期的幾何平均年報酬率，以臺灣證券交易所發行量加權股價指數為台股市場報酬率，已實現台股實質年報酬率為6.71%。無風險報酬率使用第一銀行的一年期定期存款利率，實質台幣存款年利率為3.07%，消費者物價指數年增率則為4.80%。以年資料計算的台股實質超額報酬，算術和幾何值分別為12.48%和3.63%(年)，計算月資料算術平均和幾何平均值分別為0.77%和0.25%(月)。過去37年長期的台股超額報酬現象未較歐美市場的情況更加明顯，也比一般市場的預期報酬率低。 因資料取得的限制、台股的理論超額報酬方面，1991年迄2003年的近十三年來，經固定股利成長模式和盈餘成長模式的兩種計算方式，台股的實質超額報酬分別為 0.6%和-4.3%，此時期台股的投資報酬率比起台幣存款並不突出、且是低超額報酬。同期的已實現的實質超額報酬值；算術平均1.69%和幾何平均-3.35%。評估目前台股風險溢酬，將十分接近過去37年長期歷史資料得到的超額報酬數值，算術年均值為12.48%(年)和0.77%(月)，幾何平均分別為3.63%(年)和0.25%(月)，低風險溢酬是當前台灣股票市場的一般現象。 / The difference between the observed historical investment return and the risk-free interest rate is the excess return. The equity risk premium, ERP is the expected rate of return on the aggregate stock market in excess of the rate of risk-free security. ERP is one of important factor of many asset-pricing models, including Capital Asset Pricing Model, CAPM. There were many theories and factors to explain the equity risk premium; equity premium puzzle, myopic loss aversion, survivorship bias, mean reversion & aversion and etc. Studying the value of Taiwan equity excess return and risk premium is fundamental for investors and institutions evaluating the expected market investment return and risk. Analyzing the data from year 1967 to 2003 for thirty-seven years long holding period, Taiwan Stock Exchange Capitalization Weighted Stock Index as Taiwan stock market return, the realized real return was 6.71%. One-year bank time deposit rate as NT dollars risk-free asset rate and real interest rate was 3.07% and consumer price index, CPI annual growth rate was 4.80%. The historical real yearly excess return was 12.45% for arithmetic mean and 3.63% geometric mean; the historical real monthly excess return was 0.77% for arithmetic mean and 0.25% geometric mean. Taiwan realized equity excess returns were not higher than the returns in the developed countries and were also lower than the market's expectation. Due to the limits of available data, the theoretical equity excess returns that were calculated on two theoretical models; Constant Growth Dividend Discount Model (dividend yield model) and earnings yield model were 0.6% and -4.3% from year 1991 to year 2003. Comparing the same period of historical realized excess returns of 1.69% for arithmetic mean and -3.35% geometric mean, Taiwan stock market returns were not spectacular. The current equity risk premium of Taiwan stock market is low and should be near the level of the long historical realized equity excess return.