本研究分為兩大部份，第一部份為探討利率的變動，主要研究央行每日公開市場操作對利率的影響，此部份包含了兩篇文章，分別為「以門檻自我迴歸模型(TAR，Threshold auto-regression model，Tong(1983)，Tsay(1989))估計央行公開市場操作對利率的影響」及「以Multiple Criteria Selection Model (Maddala,1983)估計央行公開市場操作對利率的影響」，研究樣本為日資料。在第一篇文章利用門檻自我迴歸模型估計用以區分央行動態性或防禦性公開市場操作的指標 的門檻值，利用估計出的 推論央行進行動態性或防禦性操作。第二篇文章利用第一篇文章所估計出的 將樣本區分為央行進行防禦性操作或動態性操作的樣本，並同時考慮央行是否進行公開市場操作反應函數及央行一旦決定進行公開市場操作後其要採取防禦性或動態性公開市場操作的反應函數，以Multiple Criteria Selection Model估計，同時本文更進一步考慮央行對於公開市場操作態度改變對此影響效果的影響，實證結果發現在央行總裁表示將更積極公開市場操作後，即2003年3月14日之後，發現當央行進行動態性公開市場操作可以有效的改變市場利率，而當央行進行防禦性操作則可以有效的沖銷準備金市償的干擾因子，降低市場利率的波動。 本論文第二部份為分析衍生性金融產品避險對公司價值的影響，比較與檢定有避險公司與無避險公司其公司價值差異，並討論公司以衍生性金融商品避險的動機，同時也比較當公司決定避險後，選擇大範圍避險與小範圍避險對公司價值是否也有影響。研究的對象為台灣上市公司中的529家公司，結果發現出口比率與公司規模是公司選擇避險重要的考慮因素，同時發現避險公司的Tobin’s Q、ROA、ROE與PMS皆大於無避險公司。 / There are two issues we concern in this paper. The first one is to investigate the daily effect of open market operation on short-term interest rate. The second one is to analysis the effect of hedging with derivatives by the firms on the firm’s value. About the first issue, the net issue of central bank’s certificates of deposit (CD) is functioned as the open market operation instrument. At beginning, employing a simple linear regression model, the benchmark model in our paper, the counter-intuitive evidence that issuance of DC decreases the short-term interest rate is found. To solve this puzzle, first, we define an index of open market operation to disentangle the effect of the defensive operation from the dynamic operation and use TAR model to estimate the value of . Next, we apply the Multiple Criteria Selection Model (MCSM) to solve the problems of selection bias and to estimate the two decision functions and the effects of daily open market operations. At last, we also consider the change of central bank’s attitude toward the open market operations. We separate the sample by the date (13-April-2003) of the speech of the governor of CBC, Fai-Nan Perng. We find that after 13-April-2003, the issuance of CD increase the short-term interest rate under dynamic O.M.O. and the coefficient is significantly different from zero, which means the daily liquidity effect exists. About the second issue, we compare and test the firm’s value difference between the firms hedging with derivatives and the firms without hedging. We also try to find the determinants of firm’s hedging. Our sample is the 529 firms listed in TSEC (Taiwan stock exchange corp.).

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Essay I: Employment Security Agreements, which are elements of Swedish collective agreements, offer a unique opportunity to study very early job search counselling of displaced workers. These agreements provide individual job search assistance to workers who are dismissed due to redundancy, often as early as during the period of notice. Compared to traditional labor market policies, the assistance provided is earlier and more responsive to the needs of the individual worker. In this study, I investigate the effects of the individual counseling and job search assistance provided through the Employment Security Agreement for Swedish blue-collar workers on job finding and subsequent job quality. The empirical strategy is based on the rules of eligibility in a regression discontinuity framework. I estimate the effect for workers with short tenure, who are dismissed through mass-layoffs. My results do not suggest that the program has an effect on the probability of becoming unemployed, the duration of unemployment, or income. However, the results indicate that the program has a positive effect on the duration of the next job. Essay II: The well-known positive relationship between the unemployment benefit level and unemployment duration can be separated into two potential sources; a moral hazard effect, and a liquidity effect pertaining to the increased ability to smooth consumption. The latter is a socially optimal response due to credit and insurance market failures. These two effects are difficult to separate empirically, but the social optimality of an unemployment insurance policy can be evaluated by studying the effect of a non-distortionary lump-sum severance grant on unemployment durations. In this study, I evaluate the effects on unemployment duration and subsequent job quality of a lump-sum severance grant provided to displaced workers, by means of a Swedish collective agreement. I use a regression discontinuity design, based on the strict age requirement to be eligible for the grant. I find that the lump-sum grant has a positive effect on the probability of becoming unemployed and the length of the completed unemployment duration, but no effect on subsequent job quality. My analysis also indicates that spousal income is important for the consumption smoothing abilities of displaced workers, and that the grant may have a greater effect in times of more favorable labor market conditions. Essay III: Evidence from around the world suggest that individuals who are awarded disability benefits in some cases still have residual working capacity, while disability insurance systems typically involve strong disincentives for benefit recipients to work. Some countries have introduced policies to incentivize disability insurance recipients to use their residual working capacities on the labor market. One such policy is the continuous deduction program in Sweden, introduced in 2009. In this study, I investigate whether the financial incentives provided by this program induce disability insurance recipients to increase their labor supply or education level. Retroactively determined eligibility to the program with respect to time of benefit award provides a setting resembling a natural experiment, which could be used to estimate the effects of the program using a regression discontinuity design. However, a simultaneous regime change of disability insurance eligibility causes covariate differences between treated and controls, which I adjust for using a matching strategy. My results suggest that the financial incentives provided by the program have not had any effect on labor supply or educational attainment.

本論文採用Fama and French[1993]所提出之三因子模式為基礎，以公司規模[firm size]、帳面淨值市價比[book to market ratio]、及市場超額報酬[market excess return]為三因子，配合動能因子[momentum]及三種不同的流動性指標[成交量，成交值，成交量週轉率]來延伸探討五因子的時間序列資產定價模式。 本文的研究資料為西元1992年1月到西元2000年12月間的452家上市公司週資料，期望能解釋月資料所無法包含的資訊內涵。 結論： (1.)台灣股票市場確實有規模效果，淨值市價比效果，動能效果，及流動性效果。 (2.)市場因子具有解釋能力。 (3.)小公司投資組合解釋效果不佳，在台灣股票市場可能有其他因素未放入評價模式中驗證。 (4.)流動性指標在台灣股票市場上，確實和股票報酬有負向的關係存在，且建議以成交量週轉率作為流動性的代表指標。 (5.)台灣股票市場有顯著的動能存在，投資者可藉由動能策略獲得更高的超額報酬。 / This article provides evidence that stock returns listed in the Taiwan Stock Exchange do have shared variation due to the “market anomalies”, such as size, book-to-market ratio, momentum, and liquidity, which have been argued by scholars and investment professionals for many years. The evidence shows that small-cap effect plays an important role in explaining the violation in stock returns after controlling for other determinants of stock returns. Besides, value, momentum, and liquidity effect do exist in the Taiwan stock market. Moreover, we suggest that turnover rate is a better proxy for liquidity in terms of its stronger relations with the stylized portfolio returns. We empirically estimate the intercepts of our asset-market models using weekly time-series data for individual securities over the sample period from 1992 to 2000 and across 452 securities. To emphasize particularly, our result does not imply that the Taiwan stock market is not an efficient market.