A comment on the role of prices for excludable public goods

Blomquist and Christensen [(2005). The role of prices for excludable public goods, International Tax and Public Finance, 12 ,61–79] argue that welfare is initially decreasing in the price of an excludable public good and that the case for a positive price for an excludable public good price is weak. We argue that this result follows from their particular characterization of the public good and that an alternative and equally reasonable characterization overturns their result. Hence, the policy case for a positive price on the public good is stronger than Blomquist and Christiansen suggest. JEL Classification H21 · H41     

展望“里约＋20峰会”把握企业可持续发展趋势

1992年，联合国在巴西里约热内卢举办了联合国环境和发展大会，有183个国家的代表出席。当时各国已感受到生态破坏的威胁，推动了一系列的国际条约以及新的承诺，并正式提出了可持续发展的理念。时隔20年，“联合国可持续发展大会”将于今年6月在巴西里约热内卢举行，因此也被称为“里约＋20峰会”。     

Personal characteristics of salespeople and the attractiveness of alternative rewards

How do personal characteristics of salespeople affect their desire for the various rewards available to them? Do younger salespeople desire different types and levels of rewards than older salespeople? Are there differences due to job tenure, marital status, family size, and so forth? In this article, the authors attempt to answer these questions. Based on an extensive investigation of the industrial sales forces from two large companies, the authors examine the relationship between personal characteristics and the sales force's valence for various rewards. Although some of the findings are consistent with current sales management practices, some are not, suggesting that present day thinking with respect to the design and administration of rewards may need more careful scrutiny.     

The Risk Map: A new tool for validating risk models

This paper presents a new method to validate risk models: the Risk Map. This method jointly accounts for the number and the magnitude of extreme losses and graphically summarizes all information about the performance of a risk model. It relies on the concept of a super exception, which is defined as a situation in which the loss exceeds both the standard Value-at-Risk (VaR) and a VaR defined at an extremely low probability. We then formally test whether the sequences of exceptions and super exceptions are rejected by standard model validation tests. We show that the Risk Map can be used to validate market, credit, operational, or systemic risk estimates (VaR, stressed VaR, expected shortfall, and CoVaR) or to assess the performance of the margin system of a clearing house.     

Positioning the World Bank

This article examines the rationale for the World Bank and explores whether its objective is best served by its current mix of activities. We are critical of the Bank's reliance on conditionality, and advocate evolution into a Knowledge Bank, which would lend with few conditions to countries with good policies and good institutions, and would concentrate on the provision of knowledge and technical assistance, rather than lending, in countries where the policy framework is poor. We also advocate an expansion in the Bank's role as a provider of global public goods; we critically examine the Banks role in relation to financial crises.