En-route sector capacity estimation methodologies: An international survey

Reliable estimation of en-route sector capacity is important, especially in high-density traffic areas where controller workload is the driver. En-route sector capacity is commonly estimated using fast-time computer simulation techniques employing models of controller workload. This paper analyses the methodologies employed by a number of countries in Europe and North America, to estimate the capacity of en-route airspace. The data used was obtained from airspace planners and managers. The survey involved interviews using pre-designed questionnaires. The results show that there are two main models used in the simulation of controller workload, and that there is considerable variation both in their application and controller involvement in the capacity estimation process.     

How successful are banking sector reforms in emerging market economies? Evidence from impact of monetary policy on levels and structures of firm debt in India

Many emerging markets have undertaken significant financial sector reforms, especially in their banking sectors, that are critical for both financial development and real economic activity. In this paper, we investigate the success of banking reforms in India where significant banking reforms were implemented during the 1990s. Using the argument that well-functioning credit markets would reflect a credit channel for monetary policy at work, we test whether a change in monetary policy has a predictable impact on borrowing behaviour of several types of firms, including business group affiliated, unaffiliated private firms, state-owned firms and foreign firms. The empirical results suggest that unaffiliated private firms have the most vulnerable to monetary policy stance during tight policy regimes. We also find that during tight monetary policy regimes, bank credit of smaller firms is more sensitive to changes in the interest rate than that of large firms. In an easy money regime, monetary policy and the associated change in interest rate does not affect change in bank credit, change in total debt and the proportion of bank credit in total debt for any of the firms. We discuss the policy implications of the findings.     

An optimistic search equilibrium

We study a market search equilibrium with aggregate uncertainty, private information and heterogeneous beliefs that are initially optimistic. Despite these biased beliefs, it is shown that all optimistic equilibria converge to perfect competition in the limit as the time between matches tends to 0.     

A note on closing the windows: Some lessons from queuing theory

Consider two departments of a government each serving customers of a particular type. We explore conditions under which a reorganization leading to both departments serving both types of customers leads to an enhancement of "efficiency" defined in terms of the expected queue size in a stochstic equilibrium.     

Fiber in the backbone! The impact of broadband adoption on firm growth in network markets

This article examined the relationship between the adoption of technology, via the deployment of broadband, on revenue growth, which is an important measure of financial performance, of the deploying firms using panel data for all of the major local exchange carriers in the US telecommunications industry from 1988 to 2001. The sector is an important network market context where the implications of deployment have substantial salience. The results show a positive relationship between broadband deployment and carriers’ revenue growth. This result implies that encouraging the adoption and deployment of broadband technologies in addition to the benefits of the consumers and firms at the receiving end of the new technology create the potential for better financial performance for the deploying firms. These results also imply that steps that can be taken to provide incentives that will hasten the further deployment of broadband will result in gains in financial performance within the sector.     

Analyzing the underlying dimensions of firm profitability

In this paper we decompose a traditional measure for firm's performance, return on sales, into four components that capture the impact of productivity, price recovery, product mix and capacity utilization, respectively, on a firm's profitability. The new measures are used as an illustration to explain changes in the performance of firms in the US telecommunications industry following deregulation. Changes in the overall profitability margin of these firms are explained by substantial but offsetting changes in their productivity, price recovery ability, product-mix maximization and capacity utilization, that have occurred as a consequence of deregulation. The new measures enable us not only to illustrate relative differences between firms in a given cross-section but also to shed light on how changes take place over time in the different components that underlie firms' profitability.     

Pareto optimality and competitive equilibrium in infinite horizon economies

The paper presents a general model of a decentralized economy evolving over an infinite time horizon. Alternative notions of price systems, competitive equilibria, efficiency and optimality are introduced. The main results characterize conditions under which the two fundamental theorems of welfare economics are valid in such a general framework.     

Random dynamical systems: a review

Summary. This paper provides a review of some results on the stability of random dynamical systems and indicates a number of applications to stochastic growth models, linear and non-linear time series models, statistical estimation of invariant distributions, and random iterations of quadratic maps.Received: 16 August 2002, Revised: 9 January, 2003, JEL Classification Numbers: C1, C6, D8, D9. Correspondence to: Mukul MajumdarThanks are due to A. Goswami and B.V. Rao for their detailed comments on an earlier version.