Evolving Market Efficiency with an Application to Some Bulgarian Shares

With new technically advanced methods and computers at our disposal, the efficient market hypothesis is once again being debated. At the same time, we are witnessing an unprecedented growth in both existing and new financial markets. These new markets are often in economies which have just recently embraced free market economics; we term these stock markets infant markets. Such stock markets are obviously not efficient in allocating the supply of savings to productive capital. We do not test whether or not these infant markets are informationally efficient, but instead examine whether and how they are becoming more efficient. We propose modelling the excess returns of individual securities using a multi-factor model with time-varying coefficients and generalised auto-regressive conditional heteroskedastic (GARCH) errors. If the markets are becoming more informationally efficient or the agents are learning, we would expect this to manifest itself as the time-varying coefficients becoming more stable as time increases. We test our model using data on four Bulgarian shares. First, we estimate an AR(2) model and a GARCH-M(1,1) model for the shares. Then, we estimated our AR(2) model with time varying coefficients and GARCH type errors. We find varying levels of efficiency and varying speeds of movement towards efficiency within our sample of four shares. This revised version was published online in July 2006 with corrections to the Cover Date.     

The welfare cost of means‐testing: pensioner participation in income support

We estimate parametric and semi‐parametric binary choice models of benefit take‐up by British pensioners and use a revealed preference argument to infer the cash‐equivalent value of disutility arising from stigma or complexity of the claims process. These implicit costs turn out to be relatively small, averaging about £3–4 per week across Income Support recipients. Using the Foster–Greer–Thorbecke measure of poverty among pensioners, we find that allowing for implicit claim costs incurred by benefit recipients raises the measured degree of poverty by not more than 13%. Copyright © 2007 John Wiley & Sons, Ltd.     

Explaining the Choice Among Regulatory Plans in the U.S. Telecommunications Industry

We investigate why different states in the United States choose different regulatory plans in their telecommunications industry. We present a simple theoretical model and an empirical analysis of the issue. We find that a state is more likely to replace rate-of-return regulation with incentive regulation when: (1) residential basic local service rates have historically been relatively high; (2) allowed earnings under rate-of-return regulation in the state have been either particularly high or particularly low; (3) the state's leaders tend to come from both major political parties, rather than from a single party; (4) the state's urban population is growing relatively rapidly; and (5) the bypass activity of competitors in the state is less pronounced.     

Transient Crowding and Crime:

A bstract . The effects on crime rates of the intrusion of large numbers of strangers into an area are investigated. The sensitivity of six different crime types ( murder, rape, assault, robbery, burglary , and larceny ) to density of strangers is estimated using a standard model of criminal behavior. The variables which reflect this density are measures of tourists, college students, shoppers from other areas, opportunities to consume alcohol , and the presence of interstate highway exits. The results suggest that an increase in the number of strangers into an area has a positive effect on the crimes of burglary, larceny, and robbery, but very little effect on assault, murder and rape. A significant finding is that "wet" counties have a higher incidence of each crime type than do "dry" counties. From a policy standpoint, officials who support economic growth in urban areas should keep in mind that an increase in the opportunity for illegal activity accompanies such growth and plan accordingly.     

Employee perceptions of corporate partnership: An affective-moral quid pro quo

An affective-moral quid pro quo model provided the framework to test the relationship between worker satisfaction, perceptions of employees' citizenship behavior, and corporate commitment to moral-ethical ideals. A total of 198 full-time employees from a wide variety of work settings anonymously completed questionnaires. More than half of the respondents held management or supervisory positions; the number of males and females was nearly equal. Participants who indicated high satisfaction with work, promotions, and co-workers, and who viewed employees in their work setting as altruistic, perceived their organization as committed to employee welfare, employee rights, product quality, and as good corporate citizens.     

Stock price effect of high-yield debt issues

This paper investigates the common stock price reaction at the announcement of the issuance of high-yield straight debt. The two-day announcement period abnormal returns are not different from zero for the 164 bond issues in the sample. No difference is found between announcement period abnormal returns of firms with bonds that default and firms with bonds that do not default. Results from statistical tests indicate that the announcement period abnormal returns are not explained by issuance year, bond-rate class, underwriter, issuance size, takeover activity or prior high-yield debt issuance experience. The findings are not consistent with the models by Miller and Rock (1985), Jensen (1986), Myers and Majluf (1984) and Krasker (1986). However, results indicate that existing stockholders are not harmed or helped by the issuance of the high-yield straight debt.     

TOWARDS A CRITICAL MANAGEMENT SCIENCE

This article examines the work of a number of writers who have attempted critical assessments of management science. Each writer has focused on specific areas that any critical management science would need to consider, viz. the origins of values, relations between organizations and society, the historical development of organizations, and the relationship between management science and developments in the capitalist mode of production. In addition these writers have declined to accept existing modes of organization as given, and have avoided the assumption that management science is inherently, or necessarily, manipulative. Each of the writers, however, has displayed several weaknesses in his analysis: thus Churchman fails to locate the management scientist in the society of which he is a part; Hales has no clear or viable alternative other than to call (in effect) for socialism, and makes the erroneous assumption that managerial strategies are necessarily effective; whilst Whitley too seems to have ‘divested management research of its practical dimension’. In conclusion it is pointed out that the actual effects of managerial strategies must be treated as problematic, since they may be modified by various forms of resistance and class struggle, and that developments in the production process may not necessarily be to the detriment of workers.     

Evaluating the Gains to Cooperation in the G-3

A model of the G-3 is introduced which has a transparent structure including a simple but analytically tractable supply side. New optimising techniques are used to conduct extensive policy experiments on this multicountry model (including full Nash solutions and a fully cooperative solution). In the case of a fiscal shock originating in theUS, we find evidence of significant spillovers to other countries, which can only be ameliorated in the fully cooperative regime.     

Dynamic panel data models: a guide to micro data methods and practice

This paper reviews econometric methods for dynamic panel data models, and presents examples that illustrate the use of these procedures. The focus is on panels where a large number of individuals or firms are observed for a small number of time periods, typical of applications with microeconomic data. The emphasis is on single equation models with autoregressive dynamics and explanatory variables that are not strictly exogenous, and hence on the Generalised Method of Moments estimators that are widely used in this context. Two examples using firm-level panels are discussed in detail: a simple autoregressive model for investment rates; and a basic production function.JEL Classification: C23This paper is prepared for a special issue of the Portuguese Economic Journal. My understanding of this subject has benefitted immeasurably from the input of colleagues, notably Manuel Arellano, Richard Blundell, Costas Meghir, Steve Nickell and Frank Windmeijer. I thank Joao Santos Silva, Frank Windmeijer and other participants at the Cemmap/ESRC Econometric Study Group workshop in London on 22 February 2002 for detailed comments on an earlier draft. Financial support from the ESRC Centre for the Microeconomic Analysis of Public Policy is gratefully acknowledged.