Air pollution and the housing market: A neural network approach

Using the neural network method, this research explores the impact of total suspended particulate (TSP) and sulfur dioxide (SO₂), two major air pollutants, and of air pollution controls on the median real price of housing in Jacksonville, Florida. The results of this case study confirm the adverse effect of air pollution on the price of housing. The simulation of the model further suggests that pollution control measures improve property values. The findings imply that, in addition to other measures influencing the price of housing, property owners and buyers take air pollution and pollution controls into account.     

Short selling and exchange-traded funds returns: evidence from the London Stock Exchange

An exchange-traded fund (ETF) is a security that tracks a basket of stocks. An ETF investor gains immediate exposure to the basket, by taking either a long or short position on this instrument. Both hedgers and speculators can short ETFs, making the informational content of increases in ETF short interest difficult to interpret. Using high-frequency (daily) short-interest data for ETFs traded on the London Stock Exchange between June 2006 and April 2010, we examine the price impact on ETFs of increases in short interest. Contrary to most of the previous empirical evidence for individual stocks, we find that large increases in ETF short interest are associated with subsequent over-performance relative to a benchmark index and this pattern is most pronounced during pre-financial crisis period.     

The behavior of MENA oil and non-oil producing countries in international portfolio optimization

It is well documented in developed economies that portfolio investment across national borders brings benefits of increasing returns and/or reducing risk. Dividing MENA stock markets into two main groups (oil producing and non-oil producing countries), this study examines the potential role of each group in providing diversification benefits for international investors. In addition, the behavior of the long and the short-run Efficient Frontiers (EFs) constructed by each of the sub-groups and the combined MENA markets is explored. Multi-objective international portfolio models are proposed under Mean-Variance and Mean-Lower Partial Moment frameworks, and the Multiple Fitness Function Genetic Algorithm (MFFGA) is used to find the EFs of optimal portfolios. The findings indicate that the stock markets of oil producing countries can be considered as a potential avenue for international portfolio diversification for investors not only from the same countries but also from the other MENA markets. It was also found that international portfolios constructed from the combination of MENA equity markets are more stable compared to the portfolios of sub-group markets. Further, the findings indicate that the behavior of short-term EFs in the MENA region cannot be predicted by the behavior of long-term EFs.     

Aberrant investor participation amid substantial price swings: high-frequency evidence of magnet-repellent effect from Malaysia

Price limits have skirted controversy since inception. Regulators claim limits curb volatility, allay stressed markets, and encourage reflection on information to trade rationally. Opponents contend saying limits delay the inevitable by postponing volatility, deferring equilibrium price discovery, and obtrude investors’ trading plans. While these undesired effects are all ex-post in nature, some argue that limits – by very existence – threaten to invite trading activities towards themselves and govern trade-flow such that the limit’s prophecy is fulfilled. This is known as magnet effect. Theoretical development of this ex-ante effect has been in hibernation since the 1990s. Thus, empirical attempts have been made to test its existence – mostly in East-Asian exchanges with tight limits. Bursa Malaysia, however, defends its ±30% limit for ~30 years based on internal (unpublished) studies. This paper employs a battery of tests to examine the existence and magnitude of magnet effect and – its counterpart – repellent effect in Malaysia. Our findings suggest a weak form of magnet effect and comparable degrees of repellent effect. Moreover, we report price acceleration beyond a threshold point unsupported by order aggression or volume support necessary to constitute a magnet effect. We discuss policy import of our findings and recommend future research avenues worthy of pursuit. Price limits’ opponents argue that limits can threaten to invite trading activities towards themselves such that the limit’s prophecy is fulfilled. Existence of this phenomenon—the magnet effect—has been tested mostly in exchanges with tight limits. This paper employs a battery of tests to examine the existence and magnitude of magnet effect in Bursa Malaysia, which employs a wide price limit. Our findings suggest a weak form of magnet effect and comparable degrees of repellent effect. Moreover, we report price acceleration beyond a threshold point unsupported by order aggression or volume support necessary to constitute magnet effect.     

Are developing countries accumulating sufficient total factor productivity to sustain their economic growth and job creation? Empirical evidence from the Middle East and North Africa region

This study contributes new evidence on why the Middle East and North Africa (MENA) region has failed to create decent jobs for decades. The growth accounting exercise reveals that the region suffered from an acute total factor productivity (TFP) deficit in the 1990s; it improved remarkably in the 2000s, before deteriorating significantly in the period between 2010 and 2017. Throughout the three subperiods, the region’s growth relied heavily on capital accumulation. The severe deficit in TFP and the heavy reliance on physical capital for decades impaired the region’s ability to sustain economic growth and to create decent jobs in the long run. The study recommends more government interventions in knowledge accumulation as a critical precondition for employment generation in developing countries.     

Graduate attributes in higher education: Examining academics' perception in the Middle East

Higher education institutes are facing increasing pressure to ensure that graduates are equipped with the right set of attributes that will make them desirable to potential employers. To deal with this pressure, universities have for some time been embedding employability attributes into their curriculum through classroom-based teaching and external programs. Yet, little research exists into examining academics' perception of graduate attributes and the potential challenges they face in delivering these attributes. The authors examine graduate attributes that are perceived as most important by academics. The findings suggest that communication, teamwork, problem solving, creativity, critical thinking, time management, and research skills were all seen as important for the employability.     

A budget impact analysis of budesonide/formoterol in patients with mild asthma in Egypt

Abstract

Background: The aim of this study is to estimate the budget impact of budesonide/formoterol fixed dose combination (FDC) vs salbutamol, both used as needed, in mild asthma patients, from the perspective of the Health Insurance Organization (HIO).

Methods: A static budget impact model was developed to assess the impact of budesonide/formoterol FDC entry on HIO budget over a 3-year period in Egyptian settings. Direct medical costs, including the costs of asthma medications, exacerbations, and management of side-effects, were obtained from HIO cost data. Population data were obtained from the World Bank and supplemented with local studies, and the rates of exacerbations, adverse effects, and number of sick leave days were elicited from the SYGMA 1 trial. Scenario analyses from a societal perspective and deterministic sensitivity analyses were conducted.

Results: The total costs (drug and non-drug costs) for managing mild asthma patients from the HIO perspective were estimated to be EGP8.563 billion before budesonide/formoterol entry compared to EGP5.525 billion post-entry, leading to a total budget savings of EGP3.038 billion after 3?years. This total budget saving included an increase in drug costs (EGP104 million) and a decrease in non-drug costs (EGP3.143 billion). Drug costs were higher in the budesonide/formoterol group than in the salbutamol group, but this cost was offset by reductions in non-drug costs, resulting in a reduction in the total costs of healthcare resources. At the societal level, the total budget savings after including the indirect costs was expected to be EGP5.976 billion after 3?years of budesonide/formoterol entry.

Conclusion: Budesonide/formoterol in mild asthma instead of salbutamol produces better patient outcomes and decreases total costs, with increases in drug cost offset by reductions in non-drug costs due to fewer exacerbations. Budesonide/formoterol is a budget saving option for guideline-directed treatment, from the economic perspective of the payer and the health perspective of the patient.     

A Skew‐normal copula‐driven GLMM

This paper presents a method for fitting a copula‐driven generalized linear mixed models. For added flexibility, the skew‐normal copula is adopted for fitting. The correlation matrix of the skew‐normal copula is used to capture the dependence structure within units, while the fixed and random effects coefficients are estimated through the mean of the copula. For estimation, a Monte Carlo expectation–maximization algorithm is developed. Simulations are shown alongside a real data example from the Framingham Heart Study.