Sensitivity and stability of efficiency classifications in Data Envelopment Analysis

A new technique for assessing the sensitivity and stability of efficiency classifications in Data Envelopment Analysis (DEA) is presented. Here developed for the ratio (CCR) model, this technique extends easily to other DEA variants. An organization's input-outut vector serves as the center for a cell within which the organization's classification remains unchanged under perturbations of the data. For the l ₁, l and generalized l norms, the radius of the maximal cell can be computed using linear programming formulations. This radius can be interpreted as a measure of the classification's stability, especially with respect to errors in the data.Abraham Charnes passed away December 19, 1992.     

On model ambiguity and money neutrality

We solve for the equilibrium of a stochastic neo-classical continuous time model without and with money under model ambiguity. We show that: (i) the correction for ambiguity stemming from the money supply is nil at equilibrium; (ii) money is neutral with respect to the stock market equilibrium (the equity risk premium); (iii) money is not neutral with respect to consumption and capital accumulation, and its effect may be quantitatively substantial; (iv) the preference for model robustness affects all the real economic variables as well as the expected inflation rate and the nominal interest rate.     

A discrete-choice experiment to assess treatment modality preferences of patients with anxiety disorder

Aims: The aim of this study was to elicit the preference of patients with an anxiety disorder regarding treatment modalities. Understanding patients’ preferences could help optimize treatment uptake and adherence to therapeutic interventions.

Materials and methods: A discrete-choice experiment was used to elicit patients’ preferences with regard to four treatment characteristics: waiting time until first treatment, intensity of treatment, face-to-face vs digital treatment, and group size. In 12 choice sets, participants were asked to choose between two treatment alternatives. A random parameters logit model was used to analyse the data.

Results: A total of 126 participants, aged 18?years and older, currently or in the previous year in treatment for an anxiety disorder, completed the survey. Respondents preferred short (over long) waiting times, face-to-face (over digital) treatment, individual (over group) treatment and a treatment intensity of one session per week rather than two sessions per week or one session every two weeks. Waiting time and treatment intensity were substantially less important to patients than level of digitalization and group size. Heterogeneity in preference was significant for each attribute, and sub-group analyses revealed this was partly related to education level and age.

Limitations: The convenience sample over-represented the female and younger population, limiting generalizability. Limited information on background characteristics limited the possibilities to explore preference heterogeneity.

Conclusions: This study demonstrated how different treatment components for anxiety disorders affect patients’ preferences for those treatments. There is significant variation in treatment preferences, even after accounting for age and education. Incorporating patients’ preferences into treatment decisions could potentially lead to improved adherence of treatments for anxiety disorders.     

The Limitations of Buyer-Option Contracts in Solving the Holdup Problem

In a recent article, Lyon and Rasmusen (2004) argue that buyer-optioncontracts are more effective at solving the holdup problem thanhas been previously recognized. This article examines the robustnessof that claim to changes in the bargaining game they analyzeand to changes in the nature of the trade between the buyerand seller. I find that the possibility of renegotiation ina model of cooperative investment (Che and Hausch 1999) doesgenerate a holdup problem if the players discount the futureand the bargaining game is sufficiently long. This change inthe bargaining game does not resurrect the holdup problem inthe basic product complexity model (of Hart and Moore 1999).However, if the good to be traded must be supplied continuallyrather than only one time, then the holdup problem reemerges(even with buyer-option contracts) for some parameter values.     

Existence of competitive equilibrium when incomes may be zero

Summary In a pure exchange economy, there exists a price vector which is a quasi-equilibrium (Debreu 1962), but this may not be a competitive equilibrium if some individuals' demand functions are discontinuous because their incomes may be zero. We show nonetheless, in a pure exchange economy with free disposal, that there is asequence of prices approaching the quasi-equilibrium along which total excess demands tend to a non-positive limit.Comments on earlier drafts from K. J. Arrow, D. Duffie, H. E. Scarf, and D. Schmeidler are gratefully acknowledged.     

Linking capacities of high‐quality relationships to team learning and performance in service organizations

This study examines the impact of intrateam and external high‐quality relationships (HQRs) on learning processes and performance. Data collected from 178 teams in the service sector indicate that (a) intrateam HQRs (i.e., between team members and between team members and their manager) are related to psychological safety, which in turn facilitates learning processes; (b) external HQRs are associated directly with team learning; and (c) team learning is positively associated with enhanced team performance. The findings highlight the importance of both internal and external HQRs to facilitate learning and enhance performance in service organizations. © 2011 Wiley Periodicals, Inc.     

The Role of Perceived Organizational Performance in Organizational Identification,Adjustment and Job Performance*

abstract Favourable organizational status and prestige has a substantial role in shaping constituents' attitudes and actions. The status and prestige of an organization is often a reflection of its achievements or performance. In the present study, we investigate the role of organizational performance or achievement (as assessed by organizational members) in evoking employees' identification, adjustment, and job performance. The results of this study indicate that two forms of organizational performance (labelled as perceived social responsibility and development and perceived market and financial performance) are associated with organizational identification. However, when compared to perceived market and financial performance, perceived social responsibility and development had a larger effect on organizational identification, which in turn resulted in enhanced employees' work outcomes – adjustment and job performance.     

The Image of Australia. Perceptions of the Australian Economy from the Eighteenth to the Twentieth Century

Recent institutionalist and post-Keynesian work on business cycles continues with the traditional institutionalist supposition that financial bubbles drive cycles; however there has been a growing sense in the literature that household consumption, not business investment, has become the key variable. This paper will show how this is a change from historical institutional theory and it will then discuss how this change pushes income distribution toward a more central role in explaining current cycle dynamics. Specifically, this paper argues that much of the economic growth over the last two decades can be attributed to the top two quintiles borrowing more and the current slow growth can be attributed to high quintile households increasing their consumption while middle income households are continuing to deleverage.     

Green taxation and individual responsibility

The current article aims at studying the effects of taxation on environmental quality, in an economy where its agents are responsible. Individual responsibility towards nature is modelized by the voluntary effort to which the households have agreed insofar as the improvement of environmental quality is concerned. It is an original way to show that the individuals may feel committed towards the environment and assume obligations towards it as well as towards environmental public policy. Given that, in our model, such effort is taken from one's allocated time for leisure, its opportunity cost is that of the sacrificed time for leisure, and is therefore equal to the individual's wage. We shall highlight that State intervention through the introduction of a (green) tax always crowds out individual responsibility. However, the intensity of this crowding-out depends on the performance of the State. Moreover, State intervention could, depending on the amount of crowding-out, reduce the overall quality of the environment. In a general equilibrium setting, we show that the crowding-out effect is not systematic. This is because there will then be an interaction between effort (or work time) and the cost of that effort (linked to the individual's wage, and therefore to production and finally to work/effort). In this article, we shall discuss the conditions under which public policy crowds out individual responsibility within this context.     

Respondent Related Correlates of Response Behaviour in Audience Research

Audience research by means of surveys has a long tradition, certainly withinarts and humanities oriented research. Yet, due to selective sampling and unitnonresponse it frequently lacks the methodological rigour to make scientificallyvalid statements based on sample estimates. This is one of the first attempts toexplore unit nonresponse in audience research. More specifically, it focuses onthe explanation of nonresponse by the socio-demographic and more topic relatedcharacteristics of a theatre audience. Using a two-step procedure for the on-sitecollection of data, the characteristics of respondents are compared with those ofnonrespondents. In step 1 the composition of the theatre audience is comparedto a proxy of a theatre population benchmark based on a weighted sample of theFlemish population (APS-2000). The validity of this best available method isdiscussed. Step 2 compares respondents with nonrespondents on a micro-level:ignoring unit nonresponse in step 1, we use logistic regression to map selectionin step 2. The chance of cooperating with the survey has been found to increasewith educational attainment and vary according to occupational category. Moreover,involvement with survey topic is confirmed as a strong predictor of survey participation.Gender, age and experience with theatre remain insignificant in predicting responsebehaviour. These findings are compared with the socio-demographic correlates ofresponse behaviour in general populations. Implications for statistically controllingfor nonresponse bias in audience research are discussed. Suggestions for furtherresearch are presented.