Waiting time probabilities in the M/G/1 + M queue

We consider an M/G/1 queueing system where the customers may leave the queue if their services do not commence before an exponentially distributed random time. The (conditional) offered waiting time distribution is approximated by a gamma distribution via matching the first and second moments of the actual waiting time. A simulation study is conducted to assess the accuracy of the approximation and it reveals that the approximation performs satisfactorily under general conditions on service time distributions.     

Money,random matching and endogenous growth: A quantitative analysis

In this study, we develop a search-and-matching monetary growth model to analyze the effects of inflation on economic growth and social welfare by introducing endogenous economic growth via capital externality into a two-sector search-and-matching model. We find that the channel through which inflation affects economic growth in the search-and-matching model is different from the traditional cash-in-advance model. To facilitate the calibration, we obtain an empirical estimate of the effects of inflation on economic growth using panel regressions. In the simulation analysis, we quantitatively evaluate the welfare effect of inflation in the search-and-matching endogenous growth model and compare it to a search-and-matching exogenous growth model. We find that the welfare effect of inflation is nonlinear in the endogenous growth model whereas it is linear in the exogenous growth model. Furthermore, we find that the welfare cost of inflation under endogenous growth is up to four times as large as the welfare cost of inflation under exogenous growth.     

The substitutes condition and the lattice structure of the set of stable allocations

In the many-to-one matching model with contracts, I show that there is no restriction on preferences weaker than substitutable preferences which guarantees that the set of stable allocations is a lattice. Thus, when contracts are not substitutes, removing agents from the economy may decrease the payoffs to existing agents on both sides of the market.     

浅谈平衡计分卡在高校食堂管理中的运用

平衡计分卡是绩效考核的一种有效工具,越来越多的营利性企业青睐于使用平衡计分卡提高企业管理水平。随着经济发展,高校后勤的社会化改革逐渐向经营性转变,食堂经营向企业模式转变,但依然保持服务性第一的特点,非财务指标显得尤为重要。文章引入平衡计分卡作为高校食堂绩效考核的新途径,建立综合评价指标体系,并分析在高校食堂管理中实施需要注意的问题,以达成高校食堂总愿景,即在保证优质服务的基础上完成营利目标。     

Scoring rules and survey density forecasts

This article provides a practical evaluation of some leading density forecast scoring rules in the context of forecast surveys. We analyse the density forecasts of UK inflation obtained from the Bank of England’s Survey of External Forecasters, considering both the survey average forecasts published in the Bank’s quarterly Inflation Report, and the individual survey responses recently made available to researchers by the Bank. The density forecasts are collected in histogram format, and the ranked probability score (RPS) is shown to have clear advantages over other scoring rules. Missing observations are a feature of forecast surveys, and we introduce an adjustment to the RPS, based on the Yates decomposition, to improve its comparative measurement of forecaster performance in the face of differential non-response. The new measure, denoted RPS*, is recommended to analysts of forecast surveys.     

Fiscal stimuli in the form of job creation subsidies

This paper examines the effects of fiscal stimuli in the form of job creation subsidies in a DSGE model with search friction and endogenous job separation. We consider two types of job creation subsidies: a subsidy for the cost of posting vacancies and a hiring subsidy. This paper finds that the effects of job creation subsides on unemployment differ between models with and without endogenous job separation. While a positive job creation subsidy shock lowers unemployment in a model without endogenous job separation, it increases unemployment in a model with endogenous job separation. We also find that while qualitatively the effects of a vacancy cost subsidy on the economy are similar to those of a hiring subsidy, quantitatively they are different.     

Gender diversity,gender norms and firm performance: Evidence from India

This paper examines the effect of gender diversity on the financial performance of firms in India. Specifically, we examine two specific aspects of gender diversity- how the implementation of gender diversity across various workforce levels affects firm performance and the role of gender norms and culture in the external environment where the firm operates in influencing the relation. Using the World Bank Enterprise Survey, 2014, we use propensity score matching and instrumental variable estimation techniques to test the effect of gender diversity on firm performance. The results suggest that better women’s representation at higher levels of the workforce is associated with better performance. In contrast, women’s representation at the worker level of the workforce does not affect performance. Additionally, the state-level gender empowerment norms strongly condition the effect of gender diversity on performance. In states with better gender empowerment indicators, firms with better female representation at all levels of permanent employment also have better performance. In contrast, there is no effect of gender diversity on performance in states with worse women empowerment indicators.     

Coloured Logic Petri Nets and analysis of their reachable trees

Logic Petri nets (LPNs) can describe and analyse the batch processing function and passing value indeterminacy in cooperative systems, and alleviate the state space explosion problem. However, the indeterminate data of logical output transitions cannot be described explicitly in LPNs. Therefore, Coloured Logic Petri nets (CLPNs) are defined in this paper. It can determine the indeterminate data of logic output transitions in LPNs, i.e., the indeterminate data can be represented definitely in CLPNs. A vector matching method is proposed to judge the enabling transitions and analyse CLPNs. From the marking equation and the proposed reachable tree generation algorithm of CLPNs, a reachable tree can be built, and reachable markings are calculated. The advantage of CLPNs can be shown based on the number of leaf nodes of the reachability tree, and CLPNs can solve the indeterminate data of logical output transitions. Finally, an example shows that CLPNs can further reduce the dimensionality of reachable markings.     

Trust,individualism and job characteristics as predictors of employee preference for teamwork

Employee resistance has long been recognized as a key constraint on the success of organizational change initiatives. However, it is only recently that employee attitudes towards working in teams has been specifically investigated as a factor influencing team effectiveness. Using data from 218 employees in 40 self-managing work teams, we examined the relationship between trust, individualism, job characteristics and team members' attitudes towards teamwork. Providing a partial test of Mayer et al.'s (1995) relational model of trust, the results indicate that the two situational forms of trust (trust in co-workers and trust in management) were stronger predictors of an employee's preference for teamwork than propensity to trust. Trust in co-workers was found to partially mediate the relationship between a person's propensity to trust strangers and their preference for working in a team. The importance of considering the dispositional variables of propensity to trust and individualism as factors that influence an employee's preference for teamwork, as well as their trust in management, trust in co-workers and their opportunity for skill utilization are discussed.     

供应链环境下产品创新的合作匹配模型

文章以供应链环境下企业间的产品创新为研究对象,分析了供应链环境下产品合作创新的影响因素,将供应链合作创新模式概括为技术转让、合作开发、创新网络、技术联盟、共建实体等5种。通过合作模式演进图描述了企业在技术、资金、人员和组织形式4方面深入合作、不断演进的过程。最后,提出了供应链产品创新的匹配模型。