Managed commodity funds

The performance of managed commodity fund investments during the years l982 through 1996 is examined, both as stand-alone investments and as assets in diversified stock and bond portfolios. Nine stylized commodity fund investments are examined: randomly-selected, single-CTAs, pool, and fund portfolios; equally weighted market portfolios (EWMPs) of CTAs, pools, and funds; and value-weighted portfolios (VWMP) of CTAs, pools, and funds. Further, two subperiods are examined: 1982–1988 and 1989–1996. Based on an analysis using Sharpe ratios as the performance criterion, several types of managed commodity funds make both good stand-alone investments and good portfolio assets; an EWMP of CTAs and a VWMP of pools receive the highest ranking among the alternative commodity fund investments. It is also shown that commodity indexes are not a substitute for a managed commodity fund investment. A number of issues warrant further study: Can investors still earn consistently attractive risk-adjusted returns on managed commodity fund investments if they do not hold diversified portfolios of CTAs and pools? Also: How can such high speculative returns be earned in efficient commodity markets? And: Are CTA and pool returns high because commodity fund managers have superior trading skill? An important issue for future research is to determine whether in fact CTAs do possess such skill. © 1999 John Wiley & Sons, Inc. Jrl Fut Mark 19: 377–411, 1999     

从服务质量及机票价格比较传统和廉价航空的优势——以澳门国际机场为例

廉价航空近年成为一种重要的旅游交通方式。本文通过问卷调查和统计分析,检验抵达澳门国际机场的飞机乘客如何对比传统和廉价航空在服务质量、票价及再次和推荐他人搭乘的意向,从而比较两者的优势。同时也检验服务质量及票价是否影响再次和推荐他人搭乘。结果发现,传统航空只在部分类别的服务质量有优势,廉价航空则在机票价格及推荐他人搭乘具有优势。另外,两种航空各有不同的服务质量类别影响再次和推荐他人搭乘。在此基础上,本文分别为两者提出改进建议。     

Using the short-lived arbitrage model to compute minimum variance hedge ratios: application to indices,stocks and commodities

The short-lived arbitrage model has been shown to significantly improve in-sample option pricing fit relative to the Black–Scholes model. Motivated by this model, we imply both volatility and virtual interest rates to adjust minimum variance hedge ratios. Using several error metrics, we find that the hedging model significantly outperforms the traditional delta hedge and a current benchmark hedge based on the practitioner Black–Scholes model. Our applications include hedges of index options, individual stock options and commodity futures options. Hedges on gold and silver are especially sensitive to virtual interest rates.     

The sensitivity of beta to the time horizon when log prices follow an Ornstein–Uhlenbeck process

This paper provides a new theoretical approach to investigate the sensitivity of the familiar beta of the capital asset pricing model to the length of the return measurement interval; a phenomenon known as the intervalling effect. By setting the problem in a continuous time setting, and using exact results, we are able to generalize existing results in the literature. We derive an expression for beta as a function of the time horizon h, conditional on current time t. We show that beta is monotonic in h and derive conditions for it to be increasing or decreasing.     

The Effect of Board Independence on Information Asymmetry

Boards have an important role in ensuring that investors’ interests are protected. Our paper first examines whether the independence of a firm's board affects information asymmetry among investors. We provide evidence that greater board independence leads to lower information asymmetry. Next, we provide evidence that more voluntary disclosure and greater analyst coverage are two underlying mechanisms via which greater board independence reduces information asymmetry. Of the two mechanisms, we find that analyst coverage is more significant in influencing how board independence affects information asymmetry. Overall, our paper contributes to a better understanding of the effect of board independence on information asymmetry.     

BEAUTY AND PRODUCTIVITY: THE CASE OF THE LADIES PROFESSIONAL GOLF ASSOCIATION

There is evidence that attractive looking workers earn more than average looking workers, even after controlling for a variety of individual characteristics. The presence of such beauty premiums may influence the labor supply decisions of attractive workers. For example, if one unit of a product by an attractive worker is more rewarded than that by her less attractive coworker, the attractive worker may put more effort into improving her productivity. We examine this possibility by analyzing panel data for individual female golfers participating in the Ladies Professional Golf Association (LPGA) tour. We found that attractive golfers recorded lower than average scores and earn more prize money than average looking players, even when controlling for player experience and other variables related to their natural talents. This finding is consistent with the notion that physical appearance is associated with individual workers' accumulation of human capital or skills. If the human capital of attractive workers is at least partly an outcome of favoritism toward beauty, then the premium estimates obtained by previous studies may have been downwardly biased. (JEL J3, J7, L8)     

Are Auditors Professionally Skeptical? Evidence from Auditors’ Going‐Concern Opinions and Management Earnings Forecasts

We examine whether auditors exercise professional skepticism about management earnings forecasts when making going‐concern decisions. Using publicly issued management earnings forecasts as a proxy for earnings forecasts provided by managers to auditors, we find that management earnings forecasts are negatively associated with both auditors’ going‐concern opinions and subsequent bankruptcy. The weight auditors put on management forecasts in the going‐concern decision is not significantly different from the weight implied in the bankruptcy prediction model. Moreover, compared with the bankruptcy model, auditors assign a lower weight to management forecasts they perceive as being less credible, including those (1) issued by managers who issued optimistic forecasts in the previous two years, and (2) predicting high earnings increases or high earnings. Taken together, our evidence is consistent with auditors being professionally skeptical about management earnings forecasts when making going‐concern decisions.     

Private debt, unused credit lines, and seasoned equity offerings

We study a sample of SEOs to examine the impact of private debt and unused credit lines on SEO underpricing and long-run stock and operating performance. We do not find significant effects of private debt financing on SEO underpricing and long-run stock underperformance. However, firms with more bank debt and unused lines of credit exhibit significantly better pre-issue operating performance. Changes in operating performance from the pre-issue year to the post-issue period are negatively related to the size of unused credit lines. Capital spending decreases with the size of unused credit lines in the year prior to SEOs, but increases following SEOs. Our overall evidence suggests that the post-issue operating performance we observed may be a result of overinvestment, which is enhanced by unused credit lines.     

DOES THE GRAVITY MODEL EXPLAIN SOUTH KOREA'S TRADE FLOWS?*

This paper applies the gravity model to explain South Korea's bilateral trade flows and to extract practical trade policy applications. A trade structure and an Asian‐Pacific trade network are included in the gravity equation to characterize the peculiarity of South Korea's trade patterns. The empirical result shows that South Korea's trade follows a Heckscher–Ohlin model more than an increasing returns or a product differentiation model. South Korea has large unrealized trade potentials with Japan and China, suggesting that they are desirable partners for an FTA. North–South Korean trade will expand markedly if bilateral relation normalizes and North Korea participates in APEC.     

News sentiment and stock market volatility

Review of Quantitative Finance and Accounting - This study investigates the effect of news sentiment on stock market volatility using the Generalized Autoregressive Conditional Heteroskedasticity...