Welfare consequences of water supply alternatives in rural Tunisia

Many economic studies have addressed the issue of inefficiency of public water supply in rural areas and the potential for improved service by private companies. Many of these analyses focused on identifying either willingness to pay or comparing average service costs and prices paid by customers. This paper performs a welfare analysis of two water supply systems—public and self owned—in rural Tunisia. The paper calculates consumer and producer surplus and compares the performance of the two systems from a social point of view. Results suggest that both systems are inefficient, mainly because of a production level that is low compared with production capacity.     

The Relative Efficiency and Implementation Costs of Alternative Methods for Pricing Irrigation Water

A useful means for achieving efficient allocation of irrigationwater is to put the right price tag on it. This article discussessome of the more pervasive pricing methods and compares theirefficiency performance, paying special attention to the impactof the cost of implementing each method on its efficiency. Thearticle uses an empirical example to demonstrate numericallythe relative efficiency of the different pricing methods andthe important role of implementation costs. The volumetric,output, input, tiered, and two-part tariff methods all can achieveefficiency, although the type of efficiency varies from onemethod to another. These methods also differ in the amount andtype of information, and the administrative cost, needed intheir implementation. The example indicates that water pricingmethods are most pronounced through their effect on the croppingpattern—more so than through their effect on water demandfor a given crop. Implementation costs have a large effect onwater tariffs and on welfare and hence should have an importantrole in determining the desirable method to use in any givenwater situation.     

The Israeli XBRL Adoption Experience

eXtensible Business Reporting Language (XBRL) is a language for the electronic communication of business and financial data which is revolutionizing business reporting around the world. It is a tool to bridge potential language barriers and unify financial reporting. This has appeal to foreign investors, among others, who can rely on information in XBRL‐tagged financial reports to make investment decisions without having to translate financial statements from local language. In 2008, Israel required most public companies to adopt International Financial Reporting Standards (IFRS) for financial reporting and to use XBRL‐tagged reporting format, as part of an aggressive effort to make its capital markets more transparent and attractive for foreign investors. In this paper, we study all Israeli public companies and analyze the accuracy and reliability of their XBRL‐tagged financial statements that are available on MAGNA, the Israel Securities Authority's electronic system. We describe the process by which the XBRL‐based data were collected and reported. We document, categorize, and analyze deficiencies in the XBRL‐tagged filings, and inconsistencies between them and the Hebrew‐based annual reports. We observe pervasive data entry errors resulting in inaccurate XBRL‐generated financial reports, which went undetected for over one year. Further, first year XBRL reporting (in conjunction with IFRS adoption) did not increase foreign investment in the Israeli capital markets. This analysis allows us to better understand the benefits and challenges of the adoption of XBRL.     

ECONOMIC FREEDOM AND STATE BOND RATINGS

Are state bond ratings, ceteris paribus, related to economic freedom? We test for the relationship between economic freedom and an aggregate index comprised of ratings by Standard & Poor, Moody's, and Fitch. We also test for a relationship between economic freedom and the ratings by these three agencies individually. With a sample covering all 50 states for the period 1995–2008, the evidence strongly indicates that state bond ratings are positively and significantly related to overall economic freedom as well as three sub‐categories of economic freedom. Our results show that the quantitative impact of economic freedom on bond ratings is comparable to the effect of state real income and the unemployment rate. (JEL E43, H71)     

Perceived Ubiquity in Mobile Services

Ubiquity has been referred to as one of the most important characteristics of mobile services. In this study, an instrument for the measurement of perceived ubiquity reflecting the benefits derived from continuity, immediacy, portability, and searchability is developed using a multiple-stage approach. In the initial stage, perceived ubiquity is conceptualized through interdisciplinary perspectives as a multidimensional, 32-item eight-factor construct. In the second stage, the original measurement is pretested on a student sample and recalibrated into a 16-item four-factor instrument. In the third stage, general consumers are invited to complete a task in which they are asked to perform a search with a mobile device before rating the measurement items. A confirmatory factor analysis produces a 12-item four-factor instrument. Furthermore, a second-order structure results from a statistical comparison of alternative models through a competing model strategy. In the final stage, we use a scenario method to validate the measurement tool while establishing discriminant, nomological, and known-group validities. The thorough validation results demonstrate the value of our instrument as a measurement tool of perceived ubiquity that is useful in describing the unique nature of mobile devices and predicting differences in user perceptions of mobile services and desktop PC services. Theoretical and managerial implications are discussed, important limitations are recognized and future research directions are suggested.     

Repeated insurance contracts and moral hazard

An attempt is made to account for the frequently observed phenomenon of insurance companies offering discounts to clients who possess a favorable record of past claims. We argue that such discounts provide a mechanism which enables both insurer and insured to counteract the inefficiency which arises from moral hazard.     

Common Sense and Simplicity in Empirical Industrial Organization

This paper is a revised version of a keynote address delivered at the inauguralInternational Industrial Organization Conference in Boston, April 2003. I arguethat new econometric tools have facilitated the estimation of models with realistictheoretical underpinnings, and because of this, have made empirical I.O. muchmore useful. The tools solve computational problems thereby allowing us to makethe relationship between the economic model and the estimating equations transparent.This, in turn, enables us to utilize the available data more effectively. It also facilitatesrobustness analysis and clarifies the assumptions needed to analyze the causes of pastevents and/or make predictions of the likely impacts of future policy or environmentalchanges. The paper provides examples illustrating the value of simulation for theestimation of demand systems and of semiparametrics for the estimation of entry models.     

ECONOMIC ANALYSIS OF ON-FARM SOLUTIONS TO DRAINAGE PROBLEMS IN IRRIGATED AGRICULTURE

Agricultural production in many semi-arid areas over the world is affected by poor drainage and saline conditions. Optimal agricultural management can be considerably different under these conditions than in locations where these problems do not occur. A long-run steady-state model is developed to analyse several management strategies for a farm with limited natural drainage and no access to off farm facilities. The model is applied to a representative farm in California. Under optimal management, the results suggest relatively small evaporation ponds, a reduction in water application, and little change in cropping patterns. Some drainage reuse is optimal when only variable reuse costs are considered. Returns to land and management are positive in all cases considered and benefits from a free off-farm facility are approximately $260/ha.