Some theorems on the existence of competitive equilibrium

The purpose of this paper is to point out a relationship between theorems on the existence of competitive equilibrium in economies with externalities, and recent results (pioneered by A. Mas-Colell) on the existence of equilibrium for economies in which consumer preferences are neither complete nor transitive. This observation leads both to a substantial strengthening of the theorem on the existence of equilibrium with externalities, and at the same time to a revealing perspective on the Mas-Colell theorem.     

A change in the time-varying correlation between oil prices and the stock market

We investigate the time-varying correlation between oil prices and stock prices. Estimation results from a multivariate DCC-GARCH model reveal that the correlation has changed since the financial crisis. Historically, the correlation has been close to zero or slightly negative. However, the correlation changed to positive during the Great Recession and continued to be positive through the first half of 2017. We investigate the role quantitative easing played in this change in correlation using a threshold model.     

基于流程的完善维修映射法

认为做到完善维修没有一个现成的标准。只有根据资产效率优化（AEO）的基本概念,生成符合客户实际需求的特定模型,才能更好地进行资产（维修）管理。而这个管理过程,SKF是通过一个基于互联网的被称之为客户需求分析（CNA）的软件工具来实现的。本文也给出了应用此工具时的一些成功数据。