The purpose of this paper is to present a new approach to econometric modeling of substitution and technical change. Substitution is determined by observable variables, such as prices of output and inputs and shares of inputs in the value of output. Our principal innovation is to represent the...

In a system with several stochastically failing parts and economies of scale in their maintenance, it may be advantageous to follow an "opportunistic" policy for maintenance. In opportunistic policies the action to be taken on a given part at a given time depends on the state of the other parts...

This paper identifies emerging trends in the world economy during the next decade. The first is that China will overtake the U.S. in terms of gross domestic product (GDP), ending more than a century of U.S. leadership as the world's largest economy. The second is that Developing Asia, excluding...

This paper introduces a new framework for projecting potential growth of the world economy, emphasizing the contribution of information technology. We first analyze the sources of economic growth for the world economy, seven regions, and fourteen major economies during four periods--1989-1995,...