Some Tests of APT Mispricing Using Mimicking Portfolios

Cross-sectional and time-series tests using mimicking portfolios are used to assess the exactness of the APT with(out) a residual market factor. The first factor seems to be sufficient to span the efficient set, whether the model is estimated using (un)conditional variance-covariance matrices that are (un)adjusted for nonsynchronous trading. Although the conditional standard deviations of the mimicking portfolios significantly explain the time-variability of security volatilities, the residuals of the mean equation still exhibit heteroskedasticity. Similar results are obtained for portfolios of CAPM-betaranked securities, and for randomly selected individual securities.     

Digital gaming culture in Vietnam: an exploratory study

ABSTRACT

New information and communication technologies continue to spread rapidly into the Asian marketplace, which has led to new patterns of leisure consumption, one of the most popular being digital gaming. However, in Vietnam there is limited research on gaming as a leisure activity. The purpose of this study is to explore the phenomenon of digital gaming in Vietnam to better understand how it is practiced in this culture. Semi-structured interviews were conducted with twenty-five gaming industry figures and gamers. Thematic analysis was used to guide data collection and analysis. The findings indicate that glocalisation, socialised gaming practices and competitiveness characterise the Vietnamese gaming experience. The distinct culture of Vietnam combined with globalised gaming consumption habits has created new modes of play culture, and hence leisure experiences that are growing in pervasive and influential ways.     

Institutions for private sector development and pro‐poor growth: Evidence from Vietnam

Using the Vietnam Household Living Standards Survey 2008, we explore the differences in pro‐poor growth performance in provinces in Vietnam according to the quality of the provinces’ institutions that support private sector activity. We exploit the localized and varying effect of French colonial legacy across Vietnamese provinces to address the endogeneity of institutions. We find strong and robust evidence of a positive effect of good‐quality institutions that support private sector activity on pro‐poor growth and that enhanced working hours and hourly wage and extended income from non‐farm self‐employment play critical roles in this outcome.     

Why do merger premiums vary across industries and over time?

We identify time-varying industry and macroeconomic factors that explain the observed variation in takeover premiums over time. Results support our hypotheses that some industry and economic factors can increase the growth prospects in an industry, which boosts expected synergies and/or demand for the target firm, and therefore increases the merger premiums. Merger premiums are higher when the target's corresponding industry experiences higher growth, has more research and development (a proxy for expected growth), and has less dispersion in performance among firms within the industry. Merger premiums are also positively related to capital liquidity, which can enhance economic growth and competition for target firms, and positively related to volatility in economic growth, which affect merger waves and the demand for target firms over time.     

Are student flows a significant channel of R&D spillovers from the north to the south?

In global context, as human capital embodies technology, international student flows may channel R&D spillovers from developed countries to less developed ones. Empirical study on a data set of 76 developing countries during 1998–2005 lends strong support to this hypothesis.     

The nature of informal food bazaars: Empirical results for Urban Hanoi,Vietnam

This paper aims to study the interesting phenomenon of informal food markets in urban areas, which have been neglected in the past research. Based on an empirical study of consumer choice between informal and formal markets (markets built-up by street hawkers vs. government-planned markets), this paper provides a basis for understanding the nature of informal markets in the Vietnamese context. The results show that cheap price and convenience (proximity) are important in shaping the choice by consumers for informal markets for food, while close relationship with sellers or services provided by sellers are not. Shoppers with higher concern for freshness and safety of fresh food are more likely to shop at formal markets. Additionally, low-income shoppers are found significantly inclined toward informal markets, while higher-income shoppers tend to shop at formal markets. Therefore, these two types of market should be viewed as two marketplaces to serve two segments of consumer groups, rather than two markets competing for a share of the business.     

A DC programming heuristic applied to the logistics network design problem

This paper proposes a new heuristic method for the logistics network design and planning problem based on linear relaxation and DC (difference of convex functions) programming. We consider a multi-period, multi-echelon, multi-commodity and multi-product problem defined as a large scale mixed integer linear programming (MILP) model. The method is experimented on data sets of various size. The numerical results validate the efficiency of the heuristic for instances with up to several dozens facilities, 18 products and 270 retailers.     

The effect of foreign segment location on the geographical diversification discount

We study how the countries in which foreign segments are located affect the value of globally-diversified firms. We use the Heritage Foundation/Wall Street Journal Index of Economic Freedom and the World Bank's Financial Development and Structure database to characterize the locations of the foreign segments. We find that U.S. globally-diversified firms with foreign segments in countries with more entrepreneurs (i.e., Business Freedom) and a better investment environment (i.e., Investment Freedom) are associated with higher excess values. Our findings suggest that globally-diversified firms can add value by carefully selecting locations for their foreign segments in countries that rate highly on key indices of economic freedom. Our analysis of the World Bank's Financial Development and Structure factors shows that investors do not value highly U.S. globally-diversified firms with foreign segments in overseas locations that share the same “financial” characteristics as their home country. We attribute that to a lack of heterogeneity between parent- and foreign segment-country characteristics, thus nullifying the diversification benefits for the parent company's shareholders.     

‘BRAIN DRAIN’ OR ‘BRAIN CIRCULATION’: EVIDENCE FROM OECD'S INTERNATIONAL MIGRATION AND R&D SPILLOVERS

This paper empirically investigates whether labour mobility can transfer technology across borders based on the panel cointegration method. Estimates of specifications on a cross‐section of 19 OECD countries during 1980–1990 lend strong support to this thesis. Data indicate that international labour movement may help transfer technology across borders in both directions: from donor countries to host countries and vice versa. This suggests that migration may more likely create a ‘brain circulation’ rather than a ‘brain drain’. In addition, human capital has a significant impact on the research and development (R&D) diffusion process as it enhances a country's capacity to learn from a foreign technology base.     

Modeling farmers’ decisions on tea varieties in Vietnam: a multinomial logit analysis

This article analyzes households’ choice on tea varieties in Vietnam by using a multinomial logit model. The modeling takes into account the issue of unobserved individual heterogeneity and the endogeneity of some explanatory variables (use of chemical and organic fertilizers). The results show that important factors influencing the decision to adopt one type of tea varieties include income, age, household size, farming contract, and use of organic fertilizers, but also membership of professional associations such as the Tea Association and the Farmers Union.