Groundwater Management in a Food Security Context

This article analyzes the sustainability of market-based instruments such as tradable permits for the management of a renewable aquifer used for irrigated agriculture. In our dynamic hydro-economic model, a water agency aims at satisfying a food security constraint within a tradable permit scheme in the presence of myopic heterogeneous agents. We identify analytically the viability kernel that defines the states of the resource yielding inter-temporal feasible paths able to satisfy the set of constraints over time and the associated set of viable quota policies. We then illustrate the theoretical results of the paper with numerical simulations based on the Western La Mancha aquifer.     

Cooperative Management of Groundwater Resources in the Presence of Environmental Externalities

This paper investigates how cooperation among users can achieve a better management of groundwater in the presence of environmental externalities. Cooperation allows users to internalize the damages caused by their activities and reduce extractions. The paper develops a game theoretical framework to assess the value of cooperation in an aquifer that is divided into three sub-aquifers that are being overly exploited. Two types of externalities are modeled: first, water extractions in each sub-aquifer impact water levels in neighboring sub-aquifers (extraction externality). Second, the three sub-aquifers are also connected to an ecosystem and thus decisions in each sub-aquifer affect the health of the ecosystem (environmental externality). A cooperative game theory model is applied. The model empirically shows how the uncontrolled extractions in each sub-aquifer affects neighboring groundwater users but also cause severe impacts to the linked ecosystem. The model is tested empirically in one of the most important aquifers in Spain, the Eastern la Mancha aquifer. The results illustrate how both extraction and environmental externalities interact in affecting the likelihood of cooperation among the users. The paper estimates the value of cooperation and its stability with and without the environmental externality.     

Mitigating Negative Water Quality and Quality Externalities by Joint Management of Adjacent Aquifiers

Groundwater basins are usually separated into aquifers that are hydrologically interrelated. This interrelation may take the form of water movement from one aquifer to another. When differentials in water quality exist, pumping from one of the aquifers can cause water movement that may be associated with degradation of its quality. A management policy that considers this interrelation may be preferable to an independent management of each aquifer. This paper develops a dynamic optimal control model to evaluate joint versus independent management. The optimal joint pumping management, in which two adjacent aquifers of different water qualities are interrelated, is analyzed and compared to independent aquifer pumping, and the situations where joint management is not required are identified. Policy implications are then derived and discussed. Finally, the theoretical model is applied to a case of interrelated aquifers in southern Israel. The empirical model identifies conditions (interest rate, agricultural fresh water supply rainfall recharge, price of surface water, drinking water quality standards) under which a joint policy is preferable. The empirical results confirm the theoretical ones.     

Alternative econometric approaches for studying the link between economic systems and economic outcomes

Econometric studies on the link between economic systems and economic outcomes have relied on two approaches. In the forecasting approach an estimated relationship for Western countries is used to generate hypothetical outcomes for Eastern countries, which are then compared to actual outcomes. In the dummy-variable approach a single relationship is estimated for Eastern and Western countries, using dummy variables to test for differences in Eastern and Western performance. The forecasting approach is shown as flawed; a more complete version of the dummy-variable approach is shown as far superior. A study of energy consumption in some Eastern and Western countries illustrates these approaches.     

On the spatial nature of the groundwater pumping externality

Most existing economic analyses of optimal groundwater management use single-cell aquifer models, which assume that an aquifer responds uniformly and instantly to groundwater pumping. In this paper, we develop an economic model of groundwater management that explicitly incorporates spatial dynamic groundwater flow equations. Calibration of our model to published economic studies of specific aquifers demonstrates that existing studies generally incorrectly estimate the magnitude of the groundwater pumping externality relative to spatially explicit models. In particular, for large aquifers with surface areas of thousands of square miles, the marginal pumping externality predicted by single-cell models may be orders of magnitude less than that predicted by a spatially explicit model, even at large distances from a pumping well. Conversely, for small aquifers with areas of a few hundred square miles or less, single-cell models reasonably approximate the pumping externality. Application of single-cell models to inappropriate settings may result in misleading policy implications due to understatement of the magnitude and spatial nature of the groundwater externality.     

Spatial-dynamic seawater intrusion and pumping cost externalities in a confined aquifer

This paper analytically develops the economic theory of seawater intrusion in confined aquifers and, in the process, creates generally applicable solution methods for illuminating steady-state spatial externality relationships for other spatial-dynamic diffusion resource management issues. By linking a confined aquifer and its unconfined recharge region with a dynamic boundary condition neglected in the economics literature, we introduce the physical realities that generate spatial externalities in all renewable confined aquifers. We derive spatial-dynamic first-order conditions for optimal extraction and characterize the policy relevant spatial-dynamic pumping cost and seawater intrusion cost externalities with hydrological assumptions appropriate to the different dynamic timescales of system components and the focus on seawater intrusion. For confined aquifers, we prove the marginal seawater intrusion cost externality decreases linearly in distance from the coast. Moreover, we demonstrate that the marginal seawater intrusion cost externality generally exceeds marginal pumping costs near the coast, implying substantial divergence between optimal and common property extraction near the coast, and significant divergence may extend to the inland aquifer boundary depending on both the magnitude and shape of the revenue function relative to extraction costs and aquifer parameters.     

Ordering the extraction of renewable resources: The case of multiple aquifers

Optimal sequencing of resource extraction is typically studied for nonrenewable resources. We provide conditions for optimal use of multiple sources of a renewable resource and characterize the resulting extraction sequence, resource scarcity values, and (single) efficiency price path for two groundwater aquifers and an abundant alternative resource. Even with one demand, the optimal sequence depends on the differential opportunity costs of the two renewables. A numerical simulation for the South O‘ahu aquifer system, which also allows for different distribution costs, illustrates the case of using the “leakier” aquifer first and then switching to simultaneous use of both resources. The welfare gain from specialization relative to independent management is $4.7 billion.     

The effects of prudential policies on bank leverage and insolvency risk in Central and Eastern Europe

This paper analyses the effects of prudential policies on leverage and insolvency risk in eleven Central and Eastern Europe banking systems in the 2005–2014 period. It explores the relationship between leverage, insolvency risk and regulation variables, and the temporal patterns of this relationship. It also examines whether the effects of prudential policies on leverage and insolvency risk are influenced by bank ownership structure and financial cycle. The paper finds a consistent link between prudential regulation and leverage, which varies over the sample period. Conversely, the insolvency risk shows a stronger relationship with macroprudential policies. The estimates reveal that prudential policies work better on leverage and z-score for foreign banks. Both leverage and insolvency risk are better mitigated over booms. Finally, prudential policies have similar effects on both domestic and foreign banks' stability in normal times, while the effects are opposite during turbulences. These dissimilarities are raising challenges to the conduct of prudential policies.     

Global terrorism: deterrence versus pre-emption

Abstract .  This paper analyses two anti-terrorism policies when a targeted nation's people and property are in jeopardy at home and abroad. A country's deterrence decision involves both external benefits and costs as the terrorist threat is deflected, while its preemption decision typically gives external benefits when the threat is reduced for all potential targets. With damages limited to home interests, a country will overdeter, while, for globalized terror, a country will underdeter. Pre-emption is usually undersupplied. Leader-follower behaviour is apt to lessen inefficiency for deterrence, but worsen inefficiency for pre-emption, compared with simultaneous-choice equilibrium allocations. Targeted nations can never achieve the proper counterterrorism policy through leadership.     

Additionality of public R&D grants in a transition economy

This paper examines the input and output additionality of public R&D subsidies in Western and Eastern Germany. We estimate the impact of public R&D grants on firms’ R&D and innovation input. Based on the results of this first step we compare the impact of publicly funded private R&D on innovation output with the output effect of R&D funded out of firms’ own pockets. We employ microeconometric evaluation methods using firm‐level data derived from the Mannheim Innovation Panel. Our results point towards a large degree of additionality in public R&D grants with regard to innovation input measured as R&D expenditures and innovation expenditures, as well as with regard to innovation output measured by patent applications. Input additionality has been more pronounced in Eastern Germany during the transition period than in Western Germany. However, R&D productivity is still larger for the established Western German innovation system than for Eastern Germany. Hence, a regional redistribution of public R&D subsidies might improve the overall innovation output of the German economy.     

广东省大中型工业企业研发效率区域差异及其收敛性

基于中间-最终产出效率的视角,运用随机前沿分析和β收敛性检验,利用2002—2010年广东省的统计数据研究了广东省大中型工业企业研发效率的区域差异及其收敛性。结果表明:广东省三大区域(珠三角地区、粤东粤西两翼地区和粤北山区)的大中型工业企业的研发中间产出效率的差异不明显,研发最终产出效率存在显著差异,该差异主要是由环境因素造成;三大区域的大中型工业企业研发中间产出效率不存在绝对收敛,而研发最终产出效率存在明显的"俱乐部收敛",并分化出珠三角地区和粤东粤西两翼地区-粤北山区两大俱乐部。     

Groundwater management under heterogeneous land tenure arrangements

We develop a groundwater extraction model that considers the Marshallian inefficiency associated with sharecropping and use data from Pakistan to simulate the impact of an open access regime and of optimal management on groundwater extractions, the state of the aquifer, and annual net benefits through time. We also evaluate a price instrument as a mechanism of inducing optimal extractions. Under both open access and optimal management, we observe notable differences in groundwater extractions and the water table level between the tenure model (which considers the behavior of both owner cultivators and sharecroppers) and the baseline model (which includes the behavior of only owner cultivators). We also find a modest difference in the aggregate net benefits generated by the two models. The results offer new insights—vis-à-vis land tenure heterogeneity—into the evaluation of more effective policies for groundwater management and aquifer sustainability.     

Taxonomy methods in credit risk evaluation

In their bid for integration with the European Union, the countries of Central and Eastern Europe are faced with the need to introduce numerous significant improvements to their economic systems. A highly important role in this process is to make changes in the existing banking systems. The credit risk evaluation method presented here, using taxonomic measures to plot so-called credit risk maps, may be used to develop sound principles of credit policies. It is a proposition that could solve one of the many problems arising in the course of adaptation of banking systems in Central and Eastern Europe to conditions of market economy.     

The evolution of east-west trade and the role of the Ecu in Eastern Europe

Conclusion This paper arrives at the conclusion that the expanding European Community is a dominant attraction for Eastern Europe, including the former USSR. Since the Community will have privileged trade arrangements with most, if not all, of Eastern Europe, optimal monetary solutions will be strongly influenced by trade relations. The future Western European currency therefore, is also playing a dominant role in the monetary choices of Eastern Europe. We have discussed several aspects of this choice (anchor of the exchange rate regime, management of foreign reserves, parallel currency and currency of a possible payments union) and conclude that the Ecu is the dominant contender.Opinions expressed in this paper are strictly personal.     

Strong maximals: Elements with maximal score in partial orders

It is usually assumed that maximal elements are the best option for an agent. But there are situations in which we can observe that maximal elements are different one from another. This is the case of partial orders, in which one maximal element can be strictly preferred to almost every other element, whereas another maximal is not strictly preferred to any element. As partial orders are an important tool for modelling human behavior, it is interesting to find, for this kind of binary relation, those maximal elements that could be considered the best ones. In so doing, we define a selection inside the maximal set, which we call strong maximals (elements with maximal score), which is proved to be appropriate for choosing among maximals in a partial order.JEL Classification: D11Acknowledgments: Financial support from the Spanish DGICYT-Feder, under project BEC2001-0781, from Fundación Séneca (PI74/00826/FS/01), Generalitat Valenciana (CTDIB2002/314) and from the IVIE, is acknowledged. The comments of the referees improved the work. We thank M. C. Sánchez and J. V. Llinares for several comments and suggestions.     

Municipal Waste Kuznets Curves: Evidence on Socio-Economic Drivers and Policy Effectiveness from the EU

Waste generation and waste disposal are becoming increasingly prominent in the environmental arena, from a policy perspective and in the context of delinking analysis. In general, waste generation is still increasing proportionally with income, and economic and environmental costs associated to landfilling are also increasing. This paper provides a comprehensive analysis of waste generation, incineration and landfill dynamics based on panel data for the EU₂₅, to assess the effects of different drivers (economic, structural, policy) and the eventual differences between Western and Eastern EU countries. We show that for waste generation there is still no Waste Kuznets Curve (WKC) trend, although elasticity to income drivers appears lower than in the past. Landfill and other policy effects do not seem to provide backward incentives for waste prevention, and in terms of landfill and incineration, as expected, they are respectively decreasing and increasing, with policy acting as a strong driver. Eastern countries appear to be performing generally quite well, thus benefiting from EU membership and related policies in terms of environmental performance. We can conclude that although absolute delinking is far from being achieved for waste generation, there are some first positive signs of an increasing relative delinking for waste generation and robust landfill diversion, and varying evidence of a significant role of the EU waste policies implemented in the late 1990s and early 2000s. Our evidence suggests that if while landfill diversion is currently associated to a delinking partly explained by EU policies, waste prevention must be the next objective of waste regulation efforts.     

Optimal Mechanisms for Heterogeneous Multi-Cell Aquifers

Standard economic models of groundwater management impose restrictive assumptions regarding perfect transmissivity (i.e., the aquifer behaves as a bathtub), no external effects of groundwater stocks, observability of individual extraction rates, and/or homogeneous agents. In this article, we derive regulatory mechanisms for inducing the socially optimal extraction path in Markov perfect equilibrium for aquifers in which these assumptions do not hold. In spite of the complexity of the underlying system, we identify an interesting case in which a simple linear mechanism achieves the social optimum. To illustrate potential problems that can arise by erroneously imposing simplifying assumptions, we conduct a simulation based on data from the Indian state of Andhra Pradesh.     

Learning from Transition Economies: Assessing Labor Market Policies across Central and Eastern Europe

Central and Eastern European countries transformedradicallytheir unemployment benefit systems and altered significantly the composition of their active labor market policy budgets in the transition process. Their recent experience is valuable from an OECD country perspective. Based on a rich data base of district-level outflows from registered unemployment and active labor market policy expenditures and intakes, this paper provides a preliminary assessment of the effectiveness of active labor market policies in Central and Eastern Europe. Estimates of an augmented matching function do not point to significant deadweight losses associated with active program intakes. This does not rule out the possibility that active policies displace those already employed, but such substitution effects may not be undesirable given the stagnancy of the unemployment pools in these countries.J. Comp. Econom.,December 1997,25(3), pp. 366–384. Università Bocconi and IGIER, Istituto di Economia Politica, via Sarfatti, 25, 20136 Milan, Italy.     

Where Schumpeter was nearly right – the Swedish model and Capitalism, Socialism and Democracy<--RID="*"-->

In Capitalism, Socialism and Democracy Joseph A. Schumpeter concluded that socialism would eventually displace capitalism in Western democracies. This would come about as a result of the superior performance of capitalism. We extract six “stylized” propositions that are essential elements of Schumpeter's prediction about the fate of capitalism. These propositions are confronted with the development of the Swedish economy. The three main results of the analysis are: (1) The evolution of the Swedish economy closely followed Schumpeter's predictions until about 1980: Large firms became increasingly predominant in production and innovative activity, ownership of firms became more and more concentrated, individual entrepreneurship waned in importance, the general public grew increasingly hostile towards capitalism, and by the late 1970s explicit proposals for a gradual transfer of ownership of firms from private hands were launched. (2) Design of tax and industrial policies fueled a development of the economy along the lines predicted by Schumpeter. In general, the policies discouraged private wealth accumulation. In particular, the policies favored concentration of firms and concentration of private ownership. (3) The turning point away from the path to socialism coincides with real world developments that disclosed two major flaws in Schumpeter's analysis. First, the ever more obvious failure of socialism in Eastern Europe went against Schumpeter's assertion that socialism can work. Second, Schumpeter, who thought that modern technology would make the giant corporation increasingly predominant, did not foresee the revival of entrepreneurship that took place in the Western countries around 1980.     

Spatial economic analysis of early detection and rapid response strategies for an invasive species

Economic impacts from invasive species, conveyed as expected damages to assets from invasion and expected costs of successful prevention and/or removal, may vary significantly across spatially differentiated landscapes. We develop a spatial–dynamic model for optimal early detection and rapid response (EDRR) policies, commonly exploited in the management of potential invaders around the world, and apply it to the case of the Brown treesnake (Boiga irregularis) in Oahu, Hawaii. EDRR consists of search activities beyond the ports of entry, where search (and potentially removal) efforts are targeted toward areas where credible evidence suggests the presence of an invader. EDRR costs are a spatially dependent variable related to the ease or difficulty of searching an area, while damages are assumed to be a population-dependent variable. A myopic strategy in which search only occurs when and where current expected net returns are positive is attractive to managers, and, we find, significantly lowers present value losses (by $270 m over 30 years). We find further that in the tradeoff between search costs and damages avoided, early and aggressive measures that search some high priority areas beyond points of entry even when current costs of search exceed current damages can save the island more ($295 m over 30 years). Extensive or non-targeted search is not advised however.