Integrating expected coverage and local reliability for emergency medical services location problems

Daskin's MEXCLP model [Daskin M. A maximum expected covering location model: formulation, properties, and heuristic solution. Transportation Science 1983;17:48-70] was one of the first efforts to capture the stochastic nature of emergency medical services (EMS) location problems within a mixed-integer formulation. With their subsequent introduction of MALP, ReVelle and Hogan [The maximum availability location problem. Transportation Science 1989;23:192-200] offered two key advances, local vehicle busyness estimates and the α-reliability objective. While these constructs have influenced many subsequent EMS location models, they have been subjected to relatively little empirical analysis. To address this, we introduce the LR-MEXCLP, a hybrid model combining the local busyness estimates of MALP with the maximum coverage objective of MEXCLP. We then solve a series of problems with all three models and employ simulation to estimate aggregate service levels. We find that LR-MEXCLP leads to modest but consistent service gains over both MALP and MEXCLP. These results support the merits of local busyness estimates, but they also suggest that the α-reliability objective may be inappropriate when seeking to maximize aggregate system response capabilities. More generally, our research underscores the utility of (a) linking modeling assumptions and goals with real-world application contexts, and (b) employing simulation or other techniques to validate theoretical results.     

Circuit Breakers with Uncertainty about the Presence of Informed Agents: I Know What You Know … I Think

This study conducts experimental asset markets to examine the effects of circuit breaker rules on market behavior when agents are uncertain about the presence of private information. Our results unequivocally indicate that circuit breakers fail to temper unwarranted price movements in periods without private information. Agents appear to mistakenly infer that others possess private information, causing price to move away from fundamental value. Allocative efficiencies in our markets are high across all regimes. Circuit breakers perform no useful function in our experimental asset markets.     

AUDITOR OBJECTIVITY: THE EFFECT OF PRIOR INVOLVEMENT IN AUDIT PROGRAMME DESIGN

This study tests whether the involvement of independent auditors in the design of an audit programme affects their subsequent audit work relating to that audit area. Two groups of subjects played roles in designing partial audit programmes for a particular account. They also evaluated partial audit programmes for another account designed by someone else. A third group merely evaluated partial audit programmes for both accounts. All subjects were informed that both audit programmes were implemented and of potential problems that could be attributed to either of the two accounts. Subjects were asked to allocate 15 hours to investigate either or both of the accounts in question. Our hypothesis was that auditors who had a role in designing a partial audit programme would allocate less audit effort to that account than auditors who had no role in the programme design. Comparisons of the hours allocated provided some support for this hypothesis.     

Understanding urban tourism: London in the early 1990s

Using London as an example this paper demonstrates that the idea of tourism as ‘pleasure and recreation’ is wholly inadequate for an understanding of the published evidence on tourism in major cities. In the UK this results directly from the definition adopted by the main statistical sources such that tourists become travellers, irrespective of purpose, who stay overnight at their destination. In so doing the paper highlights two areas for future research, the growing trend in short‐distance tourism and the increasing importance of visiting friends and relatives. Copyright © 2001 John Wiley & Sons, Ltd.     

The Role of Auditor Narcissism in Auditor-Client Negotiations: Evidence from China

This paper reports the results of three studies (archival, experimental, and qualitative) designed to examine the effects of auditor narcissism on auditor-client negotiations in China. We contend that narcissistic characteristics fuel auditors' competitiveness and embolden them to stand firm in negotiations, potentially lengthening the negotiation process but leading to more conservative negotiation outcomes. As predicted, our archival results suggest that auditor narcissism is positively associated with audit delay and negatively associated with clients' absolute and positive discretionary accruals. Our experimental results document that narcissistic auditors are more likely to be involved in negotiations that reach an impasse or take longer to resolve and that narcissistic auditors negotiate reported asset values that reflect less aggressive reporting choices. Our qualitative results from field interviews with practicing audit partners corroborate our archival and experimental findings. Overall, the data collected using three different research methods yield consistent results in support of our theory. Our findings shed light on factors that influence audit efficiency and quality in China. We discuss the key cultural and contextual differences between China and the West as well as the implications of these differences for future research.