Adjusting covariance matrix for risk management

The covariance matrix of asset returns can change drastically and generate huge losses in portfolio value under extreme conditions such as market interventions and financial crises. Estimation of the covariance matrix under a chaotic market is often a call to action in risk management. Nowadays, stress testing has become a standard procedure for many financial institutions to estimate the capital requirement for their portfolio holdings under various stress scenarios. A possible stress scenario is to adjust the covariance matrix to mimic the situation under an underlying stress event. It is reasonable that when some covariances are altered, other covariances should vary as well. Recently, Ng et al. proposed a unified approach to determine a proper correlation matrix which reflects the subjective views of correlations. However, this approach requires matrix vectorization and hence it is not computationally efficient for high dimensional matrices. Besides, it only adjusts correlations, but it is well known that high correlations often go together with high standard deviations during a crisis period. To address these limitations, we propose a Bayesian approach to covariance matrix adjustment by incorporating subjective views of covariances. Our approach is computationally efficient and can be applied to high dimensional matrices.     

Triggering the internationalization of Malaysian quantity surveying firms

Although there is an increasing trend of services being traded across borders, quantity surveying (QS) firms in the construction sector remain under-researched. The triggers for the increasing globalization of QS firms are not clear, nor how these triggers are perceived by managers at different levels. A questionnaire was administered in over 84 QS consultancy firms, and the results were analyzed using the repertory grid technique, allowing a comparison between the general respondents and a focus group of senior managers. The findings show that senior managers with significant experience realize the importance of a strong internal capability of the QS firm and the capability to develop innovative offerings, coupled with an awareness of the target market and the ability to secure revenue through key contracts. Firm- and location-specific factors were more important than other competitive advantages or foreign markets’ characteristics when deciding to globalize.     

Effects of interest rate caps on credit access

Journal of Regulatory Economics - We study the liberalization of the microcredit usury rate in Colombia and its effects on loan expansion. In February 2007 the interest rate ceiling for microcredit...     

Predictor of Business Students’ Attitudes Toward Sustainable Business Practices

This study examined individual difference characteristics as predictors of business students’ attitudes toward sustainable business practices. Three types of predictors were considered: personal values, individualism–collectivism, and leadership styles. Data were collected from 248 business students attending a mid-sized university in western United States using self-reported questionnaires. Few gender differences were present. Hierarchical regression analyses, controlling for personal demographic characteristics, indicated that business students scoring higher on Rokeach’s social value scale, collectivism, and transformational leadership also reported more positive attitudes toward sustainable business practices. Implications for research and practice are discussed.     

Customer orientation and buyer satisfaction: The malaysian housing market

This study examines the marketing of a high-involvement product, namely, houses in Malaysia, by focusing on the relationship between customer orientation, an important component of the marketing concept, and buyers' satisfaction. Using multi-item scales to measure these two constructs and employing factor analysis and stepwise regression for data analyses, the results and marketing implications drawn suggest the usefulness of these scales for developing well-defined, comprehensive and strategic marketing plans as well as providing a useful framework for formulating effective marketing strategies to enhance customer satisfaction.The first author is attached to the Faculty of Economics and Administration, University of Malaya, Kuala Lumpur, while the second author is the marketing manager of a local private firm.     

AN ECONOMETRIC ANALYSIS OF THE CANADIAN EGG MARKET

This paper analyzes the market forces - demand, supply, price and trade - operative in the Canadian egg market. Quarterly data for the period 1961–1973 (inclusive) was employed, and Three-Stage least squares procedure was applied to a 12-equation model. Eggs were found to have a very small (–.003) coefficient of direct price elasticity and a negative (–.267) coefficient of income elasticity. At supply level, lagged egg-feed price ratio had an inelastic coefficient. The model was used to forecast for 1974, and was found satisfactory.
Cette étude analyse les forces qui influencent Ie marché des œufs - la demande, l'approvisionnement, les prix et le commerce - au Canada. Les données trimestrielles couvrant la période de 1961 à 1973 (inclusif) fûrent basées sur le système du moindre carré en trois stages sur un modèle à 12 équations. II fut trouvé que les œufs donnent us très petit coefficient (– .003) d'élasticité de prix directe, ainsi qu'un coefficient négatif (–.267) d'élasticité de revenu. Au niveau d'approvisionnement, la proportion ceuf-nourriture retarded avait aussi un coefficient inelastique. Le modéle fut 'employ' pour les predictions de 1974, et fut trouvé satisfaisant.     

Eliminating Excessive Tariffs on Exports of Least Developed Countries

Although average OECD tariffs on imports from the least developedcountries are very low; tariffs above 15 percent (peaks) havea disproportional effect on their exports. Products subjectto tariff peaks tend to be heavily concentrated in agricultureand food products and labor-intensive sectors, such as appareland footwear. Although the least developed countries benefitfrom preferential access, preferences tend to be smallest fortariff peak products. A major exception is the European Union,so that the recent European initiative to grant full duty-freeand quota-free access for the least developed countries (theso-called Everything But Arms initiative) will result in onlya small increase in their exports of tariff peak items (lessthan 1 percent of total exports). However, as preferences areless significant in other major OECD countries, a more generalemulation of the European Union initiative would increase theleast developed countries' total exports of peak products byUS$2.5 billion (11 percent of total exports). Although almosthalf of this increase is at the expense of other developingcountry exports, this represents less than 0.05 percent of theirtotal exports. This trade diversion can be avoided by reducingtariff peaks to a uniform 5 percent applied on a nondiscriminatorybasis. However, such a reform would imply no gains for the leastdeveloped countries, suggesting that the globally welfare-superiorpolicy of nondiscriminatory elimination of tariff peaks shouldbe complemented by greater direct assistance to poor countries.     

Agricultural Tariffs or Subsidies: Which Are More Important for Developing Economies?

This article assesses the impact of the world price–depressingeffect of agricultural subsidies and border protection in OECDcountries on developing economies' exports, imports, and welfare.Developing economy exporters are likely to benefit from reductionsin such subsidies and trade barriers, whereas net importersmay lose as world prices rise. A simple partial equilibriummodel of global trade in commodities that benefit from domesticsupport or export subsidies is developed to estimate the relevantelasticities. Simulation results suggest that a 50 percent reductionin border protection will have a much larger positive impacton developing economies' exports and welfare than a 50 percentreduction in agricultural subsidies. Although there is significantheterogeneity across developing economies, the results suggestthat efforts in the Doha Round of negotiations should be directed at substantially reducing border protection.