On the Role of Weight Restrictions in Data Envelopment Analysis

This paper examines the role that weight restrictions play in Data Envelopment Analysis (DEA). It is argued that the decision to include a factor (input or output) in a DEA model represents an implicit judgement that the factor has a non-trivial weight. It therefore seems perverse to allow DEA to assign a trivial weight to that factor in assessing the efficiency of a unit. There is therefore a strong case for imposing restrictions on factor weights. However, many existing methods of weight restriction are in practice unwieldy. This paper proposes an alternative approach we term contingent weight restriction which is both practical and intellectually consistent with the DEA philosophy. The paper explores the implications of alternative methods of weight restriction using simulated data from a well known production process.     

Exploiting old customers and attracting new ones: The case of bank deposit pricing

Recent theoretical contributions suggest that deposit interest rates should be higher in geographic areas characterized by greater in-migration and lower for depositors at banks with greater shares of existing (or so-called “locked-in”) depositors. These hypotheses are tested using a rich data set obtained for the Spanish banking industry. Results confirm that, all else equal, banks offer higher deposit rates in territories characterized by greater in-migration, and also that they tend to offer lower rates, the larger the number of their locked-in depositors. These findings confirm the existence of the trade-off between exploiting old customers and attracting new ones.     

Elicitation of Expert Opinion in Benefit Transfer of Environmental Goods

Benefit transfer is a method for estimating the value of environmental goods that involves the use of past information on identical or similar goods. This paper considers the extent to which benefit transfer can be based on prior distributions elicited from expert opinion. We propose two alternative methods to elicit the parameters of a prior distribution from experts on environmental valuation. An experiment is carried out on the value of National Parks in Spain. The results from the elicited distributions are compared with the information provided by onsite samples of visitors. The results indicate that individual experts made different predictions about the potential value of the policy areas that were diverse and unable to accurately predict the value for each policy site. However, the average across the elicited distributions approaches the estimated distribution with empirical data and accurately predicts the relative values for the two policy sites considered.     

Defining efficient policies in a general equilibrium model: a multi-objective approach

Macroeconomic policy makers are typically concerned with several indicators of economic performance. We thus propose to tackle the design of macroeconomic policy using Multicriteria Decision Making (MCDM) techniques. More specifically, we employ Multi-objective Programming (MP) to seek so-called efficient policies. The MP approach is combined with a computable general equilibrium (CGE) model. We chose use of a CGE model since it has the dual advantage of being consistent with standard economic theory while allowing one to measure the effect(s) of a specific policy with real data. Applying the proposed methodology to Spain (via the 1995 Social Accounting Matrix) we first quantified the trade-offs between two specific policy objectives: growth and inflation, when designing fiscal policy. We then constructed a frontier of efficient policies involving real growth and inflation. In doing so, we found that policy in 1995 Spain displayed some degree of inefficiency with respect to these two policy objectives. We then offer two sets of policy recommendations that, ostensibly, could have helped Spain at the time. The first deals with efficiency independent of the importance given to both growth and inflation by policy makers (we label this set: general policy recommendations). A second set depends on which policy objective is seen as more important by policy makers: increasing growth or controlling inflation (we label this one: objective-specific recommendations).     

Monotonicity of indices of “Revealed“ comparative advantage: Empirical evidence on Hillman’s condition

Conclusions The necessary and sufficient condition suggested by Hillman [1980] for the index of RCA, when used in cross-country comparisons, to provide a one-to-one relationship between pre-trade comparative advantage and revealed comparative advantage is fulfilled for the great majority of the “commodities” traded in 1985 by 118 developing economies. Given the low level of data aggregation (the lowest for which statistical information is currently available), the large sample of countries and the high percentage of developing economies’ total exports captured in this research, we can conclude that Balassa’s export-performance index, for cross-country comparisons, is a good indicator of comparative advantage as reflected by pre-trade prices. In other words, Hillman’s condition is a useful indicator of the presence of monotonicity in indices of RCA: we have observed that at a 5-digit level of commodity aggregation, increases in Balassa’s export performance index of RCA are likely to correspond to increases in export levels. Aggregation of commodities at a 3-digit and at a 1-digit level suggests that Hillman’s condition is unlikely to be violated if the cause for values of the Hillman’s Index less than one is due to export specialization; on the contrary, the number of cases of a Hillman Index smaller than one due to a large share of world markets is expected to be negatively related to the level of aggregation. Our results suggest that Hillman’s index should be calculated in any empirical investigation trying to assess the long-term implications of trade liberalization negotiations using an export-performance index of RCA. There is evidence that, if used at a disaggregated level, the HI is a tool that may help flag cases in which the RCA index can be a misleading indicator of countries’ comparative advantage, even in cross-country comparisons. It may also help reduce disagreements regarding the most appropriate coefficient of RCA. Further research should be directed toward enlarging the sample of countries to include the entire world and to incorporate at least three years of trade so as to be able to eliminate the possible influence of cycles.     

Foresight analysis of tilapia supply chains (Sistema Producto) in four states in Mexico: Scenarios and strategies for 2018

In order to increase competitiveness among individual producers and to encourage their integration, the federal government of Mexico has pursued the establishment, at both the state and national levels, of supply chains, or Sistema Producto (SP). For fisheries and aquaculture, 33 SPs exist at the state level and 7 at the national level, 1 of them for tilapia. The objective of this study is to carry out a foresight analysis (FA) of 4 tilapia SPs in Mexico—for the States of Colima, Sonora, Tabasco and Yucatán—analyzing their 2018 vision for the development of the tilapia chain. FA provides an integral vision of both the internal and external environments, identifying the key factors for each SP and helping to develop the best strategies in order to compete successfully. Sonora, Tabasco and Yucatán identify marketing aspects as key elements for their 10-year future: adding value to the product by means of new processing technologies, developing their own brand, and identifying and differentiating their product based on sanitary issues. Colima focuses its industry future success on efficiency improvements. Finally, the main technological disruptions identified by the 4 states are the incremental use of information technology, product and process certification, new hatcheries with genetically-improved fry, and new processing methodologies developed and/or applied.     

Board independence, firm performance and ownership concentration: Evidence from Chile

What determines the composition of companies' boards in the context of high ownership concentration? Are independent directors important as an internal governance mechanism in companies with high ownership concentration? Do markets favor companies whose controlling shareholders use voting rights to elect professional directors?Using a four-year, 160-company panel data, and controlling for endogeneity, this paper addresses these three related questions, finding that an increase in the proportion of outside directors affects company value. The paper also finds that companies that present more exacerbated agency conflicts tend to incorporate professional directors to the boards, in an effort to improve corporate governance and ameliorate the agency problem.     

Interest rates,expectations and the credibility of the Bank of Spain

The purpose of the paper is to pinpoint the date of the change of monetary policy regime which occurred in Spain during the year 1984, when it moved away from controlling monetary aggregates towards interest rate targeting. The most likely date for the change is estimated and, surprisingly, there is evidence that agents learned about the new intermediate target quite rapidly.A week after the change, the term structure of interest rates showed how market agents attributed much more informational content to interest rate changes than they had previously. Two types of transitions are tried: a one-step and a gradual logistic swithing function.