Bank Cost Efficiency and Output Specification

There is a longstanding controversy over precisely what it is that banks produce. However, there is little evidence on the sensitivity of bank cost efficiency results when different output definitions are applied. This paper does exactly that. In particular, we compare nonparametric efficiency scores yielded by two output specifications, one mainly identified with the asset approach and the other which also considers deposits as output. Results show that distributions of efficiency scores, estimated nonparametrically by means of kernel smoothing, vary greatly. In addition, firms' positions relative to the mean change according to either output definition, and results do not remain constant over time.     

Biased Technical Change and the Malmquist Productivity Index

The Malmquist productivity index has many attractive features. One is that it can be epxressed as the product of a technical efficiency change index and a technical change index. In this paper we express the technical change index as the product of a magnitude index and a bias index. We then express the bias index as the product of an output bias index and an input bias index, and we state conditions under which each bias index makes no contribution to productivity change.     

An international comparison of educational systems: a temporal analysis in presence of bad outputs

This study uses the global non-radial Malmquist index to measure performance change in the educational systems of 29 countries/economies participating in PISA 2003 and 2012 for students at age 15 in the disciplines of mathematics and reading. This methodology is particularly appropriate both for its desirable properties as well as its suitability for the educational context. Results indicate a positive evolution in educational systems’ performance during this period. This improvement is mainly due a positive efficiency change, which offsets the negative technological change observed. Nevertheless, a deeper scrutiny at the country level shows that results varied remarkably among them.     

INCENTIVE REGULATION AND THE ROLE OF CONVEXITY IN BENCHMARKING ELECTRICITY DISTRIBUTION: ECONOMISTS VERSUS ENGINEERS

ABSTRACT ** :  This note illustrates the potential impact of the specification of a convex production technology on establishing minimal costs compared to the use of a non-convex technology when benchmarking electricity distributors. This methodological reflection is mainly motivated by recent engineering literature providing evidence for non-convexities in electricity distribution. An empirical illustration using non-parametric specifications of technology illustrates this main point using a sample of Spanish electricity distribution firms earlier analysed in Grifell-Tatjé and Lovell (2003) .     

The dynamics of international trade integration: 1967–2004

This article explores how trade integration has advanced over the last four decades and what the foreseeable future holds, among other related questions. To this end, we consider certain methods which have scarcely been used in the literature on trade integration. First, we measure trade integration through a set of indicators which control not only for how open economies are, but also for their degrees of connectedness in the World Trade Web. Second, we assess how these indicators have evolved over time, what the likely steady state distribution might be, and whether results could differ depending on a variety of weighting schemes (GDP, population). The results show that, under current trends, future world trade will be much more trade-integrated, especially for the most heavily populated countries. However, there is still a long way to go before reaching the hypothetical scenario of geographically neutral trade.     

An Index Approach to Measuring Product Differentiation: A Hedonic Analysis of Airfares

The main objective of this paper is to introduce an Allen-type index of differentiation based on cost functions. With this index, we create an economic measure of product differentiation that quantifies differences between products. Applied research has some generally accepted economic measures, for example, the Herfindahl–Hirschman Index for market concentration, or the Gini coefficient for inequality. Product differentiation, however, does not yet have an established measure. Our objective is to fill that gap and introduce a measure that can be used in market-related applied research such as market power, antitrust, price indexes, or market strategy. To operationalize the index, we introduce the concept of a core product and use cost functions to measure the degree of differentiation from the core product. To demonstrate the use of the index, we study the effect of product differentiation on price formation in the airline industry using an enhanced hedonic model. The model is empirically tested on 103,980 observations of quarterly US domestic airfare data between 2002 and 2016 and shows that product differentiation has a significant effect on both price and mark-up.