Semitractability of optimal stopping problems via a weighted stochastic mesh algorithm

In this paper, we propose a Weighted Stochastic Mesh (WSM) algorithm for approximating the value of discrete‐ and continuous‐time optimal stopping problems. In this context, we consider tractability of such problems via a useful notion of semitractability and the introduction of a tractability index for a particular numerical solution algorithm. It is shown that in the discrete‐time case the WSM algorithm leads to semitractability of the corresponding optimal stopping problem in the sense that its complexity is bounded in order by with being the dimension of the underlying Markov chain. Furthermore, we study the WSM approach in the context of continuous‐time optimal stopping problems and derive the corresponding complexity bounds. Although we cannot prove semitractability in this case, our bounds turn out to be the tightest ones among the complexity bounds known in the literature. We illustrate our theoretical findings by a numerical example.     

Challenges faced by world tourism cities – London’s perspective

World tourism cities perform multiple functions and exhibit various characteristics that influence tourism development within their boundaries. They are the main gateway for tourists visiting a country and their success has a direct impact on the visitor economy of that destination. London, the focus of this research, has been one of the world’s top tourism cities for many years, and a key gateway for domestic and international visitors. But despite the important role tourism plays in the economy of the city, there is limited research on the development of this activity in the capital. Using London as an exploratory case study, this paper contributes to better understanding the challenges faced by policy makers when planning and managing tourism in world cities. The adopted research method offers the advantage of gathering insightful information using multiple data collection techniques. Examining this new evidence contributes to expanding the knowledge on the particularities of tourism development in one of the top world cities, which could help policy makers in their efforts to better prepare for potential challenges faced by these complex but important destinations.     

People,Actors, and the Humanizing of Institutional Theory

In much contemporary institutional scholarship, the term ‘actor’ is used as a shorthand for any entity imbued with agency. Talking about actors in institutions thus serves the necessity of allocating agency before returning to the analysis of institutional structures and processes. We find this approach to actorhood limiting, conceptually and normatively. Grounded in the perspective of pragmatist phenomenology, we assert the need for distinguishing between persons and actors, and the value of integrating the person into institutional analysis. We conceive of persons as humans with a reflective capacity and sense of self, who engage with multiple institutions through the performance of institutional roles. People may acquire actorhood by temporarily aligning their self with what is expected from a particular actor-role in an institutional order. Conversely, institutions enter people’s lifeworld as they are personified in people’s social performances. We outline this perspective and examine conceptual and normative implications that arise from the integration of human experience in institutional analysis.     

Communication via a strategic mediator

This paper investigates communication between an informed expert and an uninformed principal via a strategic mediator. We demonstrate that, for any bias in the parties' preferences, there exists a strategic mediator that provides the highest expected payoff to the principal, as if the players had communicated through an optimal non-strategic mediator.     

The impact of the managed care backlash on health care spending

The health spending slowdown associated with the managed care revolution in the 1990s suggests that managed care may have been successful in controlling health care spending. I exploit the passage of state regulation during the “managed care backlash” as well as geographic variation in managed care intensity to measure the impact of managed care on spending. I find that restricting managed care causes a large and significant increase in hospital spending, which cannot be explained by changes in hospital market concentration, other regulatory activity, and multiple other possible explanations. I also do not find effects of the backlash on mortality.     

Driving forces of chemical risks for the European biodiversity

In the framework of the EU-funded research project ALARM (Assessing LArge-scale environmental Risks with tested Methods), an original method combining the DPSIR (driving forces–pressures–state–impacts–responses) framework and an analysis based on the distinction between the four spheres of sustainability (environmental, economic, social and political) has been developed. This paper presents the application of this method, called “the tetrahedral DPSIR” for the identification and analysis of driving forces of environmental chemicals risks for biodiversity, in Europe. The purpose of this methodology is to help reduce the pressures on biodiversity through modifying the driving forces behind them by offering scientific advice to policy makers. We frame our analysis in the context of the current policy, namely the implementation of REACH (Regulation on the Registration, Evaluation, and Authorization of CHemicals).     

The Role of Cultural and Symbolic Capital in Entrepreneurs' Ability to Meet Expectations about Conformity and Innovation

We conceptualize entrepreneurs' success in acquiring resources as the outcome of a socially embedded process of pursuing legitimacy, which in turn encompasses their ability to meet field incumbents' expectations about conformity and innovation. Drawing from Bourdieu's theory of practice, we specifically discuss entrepreneurs' ability, when entering a business field, to simultaneously conform to existing field arrangements (i.e., to "fit in") and to be perceived as innovators (i.e., to "stand out"). A possible paradoxical relationship marks entrepreneurs' ability to meet both of these expectations; we discuss the role of entrepreneurs' cultural and symbolic capital in this process. In addition, two contingency factors may influence how entrepreneurs' ability to fit in and stand out affects their resource acquisition. First, the contribution of the two facets of legitimacy to resource acquisition is influenced by the maturity of the field the entrepreneur enters. Second, entrepreneurs' resource acquisition may be enhanced by their ability to artfully navigate the possible conflicting demands to fit in versus stand out through impression management.     

Information acquisition,coordination, and fundamentals in a financial crisis

This paper reconciles the two explanations of a financial crisis, the self-fulfilling prophecy and the fundamental causes, in an empirically-relevant framework, by explicitly modeling the costly voluntary acquisition of information about fundamentals in a variant of Diamond and Dybvig [Diamond, D., Dybvig, P., 1983. Bank runs, deposit insurance, and liquidity. Journal of Political Economy 91, 401–419]. The model exhibits strategic complementarity in information acquisition. In the “partial run” equilibrium investors engage in costly evaluation of projects, so that banks with lower-return projects fail. There also exist the classic “full-run” and “no-run” equilibria in which there is no project evaluation. Investors’ coordination on a specific equilibrium is triggered by a self-fulfilling prophecy. So, financial crises are seen as both fundamentals-based and self-fulfilling prophecies-based phenomena.     

Trajectories of Russian manufacturing firms’ growth after the global financial crisis of 2008–2009: the role of restructuring efforts and regional institutional environment

The aim of this article is to conduct an empirical investigation and reveal which types of modernisation strategies and characteristics of regional institutional environment are likely to be associated with patterns of the performance of Russian manufacturing firms in 2007–2012. In addition to estimating the impact of ex-ante behaviour on the rate of sales growth, we use hierarchical cluster analysis to reveal the typical trajectories of firms’ sales growth. We find that the dynamic of sales for more than 90% of firms can be described by just two types of performance curve: (a) crisis decline with recovery and growth; and (b) crisis decline with weak recovery and stagnation. Firms that invested more prior to the crisis and implemented active restructuring were more likely to have positive post-crisis dynamics of sales. We find evidence that firms in the regions with lower levels of corruption (both administrative and everyday) were more likely to recover successfully after the crisis.     

Sustainable tourism implementation in urban areas: a case study of London

Sustainable tourism is a concept widely embraced by managers and planners of tourist destinations. However, it has received little attention in the context of urban tourism, an area of research that has until recently been largely neglected by academics. This paper contributes to the body of knowledge on sustainable tourism implementation in large cities, by using London as an exploratory case study. Through the collection and analysis of both primary and secondary data (online survey, semi-structured interviews and document analysis), it seeks to explore whether local authorities have implemented policies towards sustainable tourism in the capital. The findings indicate that although the concept of sustainable tourism is perceived as important by policy makers, only a few local authorities in London promote its principles in their policy documents and even fewer have initiatives to put them in practice. Most of these initiatives are isolated activities which address limited aspects of sustainable tourism. The paper concludes that despite some progress made to date, in the current economic climate, growth and development remain the main objectives of governments and local authorities, while social and environmental issues are often left behind.