全球化工"绿色"盎然

在过去的十年中．人们在改变化学工业发展理念和政府对待污染防治的态度方面获得了巨大进展．而且已经触及“绿色”化工。事实上，由于有“绿色”化工的诱人前景作为发展动力。全球化学工业逐步变“绿”将成为不可阻挡的发展趋势。     

Endogenous market incompleteness without market frictions: Dynamic suboptimality of competitive equilibrium in multiperiod overlapping generations economies

In this paper, we show that within the set of stochastic three-period-lived OLG economies with productive assets (such as land), markets are necessarily sequentially incomplete, and agents in the model do not share risk optimally. We start by characterizing perfect risk-sharing and find that it requires state-dependent consumption claims which depend only on the exogenous shock realizations. We show then that the recursive competitive equilibrium of any overlapping generations economy with weakly more than three generations is not strongly stationary. This then allows us to show directly that there are short-run Pareto improvements possible in terms of risk-sharing and hence, that the recursive competitive equilibrium is not Pareto optimal. We then show that a financial reform which eliminates the equity asset and replaces it with zero net supply insurance contracts (Arrow securities) will implement to Pareto optimal stochastic steady-state known to exist in the model. Finally, we also show via numerical simulations that a system of government taxes and transfers can lead to a Pareto improvement over the competitive equilibrium in the model.     

Asset Write‐downs: Evidence from 2001–2008

Accounting for asset write‐downs has received substantial media attention throughout the Global Financial Crisis and has been the subject of academic debate and numerous accounting regulations during the past three decades. This study provides evidence of the magnitude and frequency of quarterly asset write‐down activities for a sample of US firms between 2001 and 2008 and examines whether reported asset write‐downs mirror market and economic indicators during the sample period.     

Fixing health care from the inside, today

Today, you are about as safe in a U.S. hospital as you would be parachuting off a bridge or a building. But it doesn't have to be that way. Right now, some hospitals are making enormous short-term improvements, with no legislation or market reconfiguration and little or no capital investment. Instead of waiting for sweeping changes in market mechanisms, these institutions are taking an operations approach to patient care. In case after detailed case, the article describes how doctors, nurses, technicians, and managers are radically increasing the effectiveness of patient care and dramatically lowering its cost by applying the same capabilities in operations design and improvement that drive the famous Toyota Production System. They are removing ambiguity in the output, responsibilities, connections, and methods of their work processes. These changes-which can be done in the course of an ordinary workday, sometimes in a matter of hours-are designed to make the following crystal clear: Which patient gets which procedure (output); Who does which aspect of the job (responsibility); Exactly which signals are used to indicate that the work should begin (connection); and Precisely how each step is carried out (method). Equally important, managers are being transformed from rescuers who arrive with ready-made solutions into problem solvers who help colleagues learn the experimental method. Thus, these hospitals are breaking free of the work-around culture that routinely obscures the root causes of so many problems, creates so much waste, and leads to so many unnecessary deaths.     

Shaking the tree: an agency-theoretic model of asset pricing

Summary. In this paper, we develop an agency-theoretic extension of the Lucas asset pricing model and examine the resulting asset price dynamics. In the model, an agent of the firm can expand or contract the firms output and dividend payments in response to exogenous shocks, although expansions become increasingly costly for the agent to maintain. Analysis of numerical simulations shows that the time-series of equilibrium asset prices exhibits both significant time-varying conditional heteroskedasticity, and longer memory persistence.We would like to thank Beth Shorish for her patience and guidance during this project, as well as conference participants at the 1998 North American Econometric Society Summer Meetings, Montreal, and the 53rd Econometric Society European Meetings, Berlin for their many useful comments.     

Social enterprise for work integration in 12 european countries: a descriptive analysis*

Abstract ** : The development of social enterprise is a rapidly emerging trend in Europe. And one sector where they have found a particularly important place is in work integration, addressing some of the more difficult problems of social exclusion in labour markets. The study on which this paper is based was a large scale comparative analysis of developments of these social enterprise in 12 European countries While there are clear differences in national contexts, there are also similarities in the forms and characteristics of these social enterprise across Europe. It is argued that this form of social enterprise has proved effective and is an important innovation to address problems of more marginalised groups and individuals, but there remain issues about how to sustain and promote the good models and good practices developed.     

Sufficient conditions for the existence of sunspot equilibria

This paper reports on conditions on agents' preferences and endowments sufficient to guarantee the existence of sunspot equilibria in a simple overlapping generations model of pure exchange. Sunspot equilibria are those in which uncertainty extrinsic to the economy operates through expectations to yield a fulfilled expectations competitive equilibrium in which the extrinsic randomness has real effects on prices and allocations. The paper also provides necessary and sufficient conditions for these equilibria to have agents trading in a fixed stock of valued fiat money. The condition derived can be interpreted as requiring that intertemporal income effects appropriately dominate substitution effects.     

The electricity market game

This paper examines the effects of imperfect competition in unregulated electricity markets from a general equilibrium perspective, and demonstrates that horizontal market power can explain both the large peak-period price spikes observed recently in California and elsewhere, and the marked reduction in addition to capacity that have also occurred during the transition to competitive markets.