A study of several new and existing tests for heteroscedasticity in the general linear model1

Several optimum non-parametric tests for heteroscedasticity are proposed and studied along with the tests introduced in the literature in terms of power and robustness properties. It is found that all tests are reasonably robust to the Ordinary Least Squares (OLS) residual estimates, number and character of the regressors. Only a few are robust to both the distributional and independence assumptions about the errors. The power of tests can be improved with the OLS residual estimates, the increased sample size and the variability of the regressors. It can be substantially reduced if the observations are not normally distributed, and may increase or decrease if the errors are dependent. Each test is optimum to detect a specific form of heteroscedasticity and a serious power loss may occur if the underlying heteroscedasticity assumption in the data generation deviates from it.     

Equilibrium in abstract economies without ordered preferences and with a measure space of agents

We report a generalization of Aumann's (1966) existence theorem to economies without ordered preferences and with externalities in consumption. Our work can alternatively be viewed as a generalization of the Shafer–Sonnenschein (1975) theorem to economies with a continuum of agents.     

Leveraging Virtual Attribute Experience in Video Games to Improve Brand Recall and Learning

This article extends the concept of virtual direct experience (VDE) from a product to an attribute as video gamers can virtually experience an attribute within a gaming environment. Using a 2 (VAE: present versus absent) x 2 (order of brand presentation: first or second) between subjects experimental design, we find that associating a brand with virtual attribute experience (VAE) by exposing consumers to the brand name and the virtual experience simultaneously has a positive effect on brand recall, brand extension acceptance, overall attitude, and purchase intention. In addition, our results demonstrate a significant interaction between VAE and telepresence on brand recall.     

The Impact of Innovativeness and Development Time on New Product Performance for Small Firms

Timing is becoming a new source of competitive advantage. The business press extols the benefits of faster product development. This paper examines whether competitive advantage can be gained by reducing development time across all types of new products or whether this advantage is restricted to certain types of new products. It proposes that product innovativeness moderates the relationship between development time and initial market performance. A survey of 110 small manufacturing firms in computer related industries supports the hypothesis. The survey findings indicate that a firm must guard against over- or under-development of the new product since product innovativeness was found to influence the impact of development time on market performance. The implications for managers are: beware of bringing a new product that is too much, too early or too little, too late.     

Intraday volume and volatility relations with and without public news

This paper reexamines the dynamic relation between intraday trading volume and return volatility of large and small NYSE stocks in two partitioned samples, with and without identifiable public news. We argue that the sequential information arrival hypothesis (SIAH) can be tested only in periods containing public news. After partitioning the sample into periods with and without public news, we find bi-directional Granger-causality between volume and volatility in the presence of public information as hypothesized by the SIAH. Our analysis further suggests that return volatility is higher in the periods with public news, while trading volume is significantly higher in the no-news period; perhaps owing to the importance of private information for trading stocks. Using the sample without public news, we find evidence that volume Granger-causes volatility without feedback. These results are broadly consistent with behavioral models like the overconfidence and biased self-attribution model of [Daniel, K., Hirshleifer, D., Subrahmanyam, A., 1998. Investor psychology and security market under- and over-reactions. Journal of Finance 53, 1839–1885]. It appears that overconfident investors overrate the precision of their private news signals and therefore trade too aggressively in the absence of public news; when public news arrives, investors’ biased self-attribution triggers excessive return volatility.     

Impact of formalisation of property rights in informal settlements: Evidence from Dar es Salaam city

This paper aims to study the responsiveness of the informal property market and management systems towards the introduction of land registration for informal settlements in Tanzania. City governments are increasingly recognising the need to strengthen legal rights for the urban poor as a means to bring them more effectively into the urban economy and ensure better provision of water, sanitation and other primary services. The research focuses on Tanzania and in particular two case studies within Dar es Salaam. The findings of the work suggest that the introduction of residential licenses whilst potentially assisting in creating legal certainty has not resulted in the financial sector accepting them as full security against loans. Accessing credit by the poor however has not yet been fully realised resulting in some further hurdles for the financial sector to overcome. Finally, and of some significance is the registration of property in the informal settlements has provided the opportunity of formal property transactions within these settlements.     

Budgeting practices in the Turkish hospitality industry: An exploratory survey in the Antalya region

The present study aims to explore budgeting practices of Turkish hotels in the Antalya region which is the most prominent tourism center of the country. The results indicate that having a budget committee and budget manual are common for Turkish hotels. Secondly, participative budgeting is advocated within the industry. Furthermore, budget period seems dynamic, because hotels state that they revise budgets and make periodic reporting within the budget period. Profitability and cost control are the primary reasons in budget preparation. Finally, budgets are viewed as one of the primary performance indicators.