预期更新技术出现时新技术采用中经营成本对投资策略的影响

The adoption of new technologies often represents acrucial component of firms' investment decisions.This paper studies a dynamic duopoly model in which two firms compete in adoption of current technology with afurther new technology anticipated.Here it is assumed that the operating costs are not zero which has more explanatory power of the real world.There exist three kinds of equilibria that may occur in adoption of current technology,which mainly depends on the level of operating costs and the first-move advantage.It shows that the faster technological substitution or innovation encourages the leader to invest earlier while induces the follower to invest later.Furthermore,like the investment costs,with the increase of operating costs the follower tends to invest later while the leader tends to invest earlier,the investment thresholds are more sensitive to the change of operating costs than that of investment costs.     

一个随机开放经济中的财富偏好和财政政策

本文把财富偏好结合进入一个开放经济的随机模型.通过对生产技术、效用函数和随机冲击做了确定的假设,我们得到了许多显式解,包括居民的总消费、期望经济增长率和所有资产的均衡回报;进一步讨论了财政政策和财富偏好怎样影响经济增长和社会福利.     

人力资本、自然资本与最优经济增长要素分析

通过把人力资本、自然资本与社会生产总量联系起来 ,由消费物资多少、获得知识多少及自然资本存量大小这三因素来确定效用 ,提供了物质、人力和自然资本三种重要资产增长的模型框架 ,得到了经济的消费增长率、均衡时各种资本的增长率之间的关系和实现最优经济增长的控制策略 .