the impact of ict investment and energy price on industrial electricity demand dynamic growth model approach the authors investigate the effects of information and communications technology ict investment electricity price and oil price on the consumption of electricity in south korea s industries using a logistic growth model the concept electricity intensity is used to explain electricity consumption patterns an empirical analysis implies that ict investment in manufacturing industries that normally consume relatively large amounts of electricity promotes input factor substitution away from the labor intensive to the electricity intensive moreover results also suggest that ict investment in some specific manufacturing sectors is conducive to the reduction of electricity consumption whereas ict investment in the service sector and most manufacturing sectors increases electricity consumption it is concluded that electricity prices critically affect electricity consumption in half of south korea s industrial sectors but not in the other half a finding that differs somewhat from previous research results reasons are suggested to explain why the south korean case is so different policymakers may find this study useful as it answers the question of whether ict investment can ultimately reduce energy consumption and may aid in planning the capacity of south korea s national electric power

the inherent inefficiency of simultaneously feasible financial transmission rights auctions abstract empirical evidence from the new york iso shows that the clearing prices for point to point congestion revenue rights also known as financial transmission rights ftrs resulting from centralized auctions conducted by independent system operators differ significantly and systematically from the realized congestion revenues that determine the accrued payoffs of these rights the question addressed by this paper is whether such deviations are due to price discovery errors which will eventually vanish or due to inherent inefficiencies in the auction structure we show that even with perfect foresight of average congestion rents the clearing prices for the ftrs depend on the bid quantity and therefore may not be priced correctly in the financial transmission right ftr auction in particular we prove that quantity limits on the ftr bids may cause the auction clearing prices to differ from the bid prices this phenomenon which is inherent in the theoretical properties of the optimization algorithm used to clear the auction is further illustrated through numerical simulations with test systems we conclude that price discovery alone would not remedy the discrepancy between the auction prices and the realized values of the ftrs secondary markets or frequent reconfiguration auctions are necessary in order to achieve such convergence

a new decision rule for lateral transshipments in inventory systems this paper deals with a single echelon inventory system consisting of a number of parallel local warehouses facing compound poisson demand there are standard holding and backorder costs as well as ordering costs at all warehouses normally the warehouses replenish from an outside supplier however lateral transshipments between the warehouses are also possible such transshipments take no time but incur additional costs when a demand occurs at a warehouse the question is whether the whole demand or part of it should be covered by a lateral transshipment from another warehouse given a set of alternative decisions our decision rule minimizes the expected costs under the assumption that no further transshipments will take place this rule is then used repeatedly as a heuristic a simulation study illustrates how the suggested technique performs under different conditions

forecasting hourly electricity prices using armax garch models an application to miso hubs abstract the recent deregulation of the electricity industry and reliance on competitive wholesale markets has generated significant volatility in wholesale electricity prices given the importance of short term price forecasts in this new environment this paper estimates and evaluates the forecasting performance of four armax garch models for five miso pricing hubs cinergy first energy illinois michigan and minnesota using hourly data from june 1 2006 to october 6 2007 our empirical results reveal three important patterns a electricity price volatility is regional and the optimum volatility model depends in part on the hub location the forecast horizon and regulated versus unregulated status of the market b the aparch model performs well in hubs in deregulated states and c volatility dynamics in regulated states are better captured by a simple garch model and thus are less complex

note periodic review s s policies for joint replenishment inventory systems this note deals with the joint replenishment problem with stochastic demands a new class of policies called ps s policy is proposed for this problem the proposed policy uses independent periodic review s s policies for each item results on test problems show that the proposed policy is superior to other classes of policies for the problem

a global survey and review of the determinants of transaction costs of forestry carbon projects reducing carbon emissions in the forestry sector by means of market based schemes is considered a cost effective measure for tackling climate change impacts however the transaction costs tcs involved are typically unknown or unquantified and therefore often neglected in this study three types of tcs search design and negotiation costs were measured in person days and monetary terms based on a global survey of forestry carbon projects implemented across latin america asia and africa cost estimates vary between zero and 1 201 tco2 for person days and from zero to us 1 738 tco2 for monetary costs key drivers of tcs are identified based on the characteristics of the project in general the transaction the transactors involved and institutional design the latter type of characteristic is shown to have a particularly large impact on tcs

transaction costs of tradable white certificate schemes the energy efficiency commitment as case study this paper analyses the nature and scale of transaction costs tcs borne by obliged parties under a tradable white certificate twc scheme taking the first phase of the energy efficiency commitment eecl in great britain as a case study several sources of tcs were considered such as search for information persuasion of customers negotiation with business partners and measurement and verification activities information was obtained through interviews and a questionnaire distributed to obliged parties results show that the most significant sources of tcs were related to search for information persuading customers and negotiating with managing agents contractors to implement energy efficiency measures perceived high tcs related to contract negotiation and liability risks slightly reduced the low trading level the scale of tcs was estimated to be around 10 and 30 of total investments costs for the lighting and insulation segments respectively the results indicate that despite the presence and scale of tcs the eecl scheme generated energy savings that yielded net societal benefits estimated financial benefits range from 0 6 to 6 p kwh for insulation and lighting savings respectively when avoided external costs due to electricity savings are included estimated economic benefits range from 3 to 8 p kwh several lessons from the eecl can be drawn for twc schemes among others it is found that informative policy instruments to raise awareness among end users are critical if a twc scheme is to deliver cost effective energy savings in all the nature and scale of tcs under twc schemes will differ because of a number of endogenous and exogenous determinants c 2007 elsevier ltd all rights reserved less

speculation in the oil market the run up in oil prices since 2004 coincided with growing investment in commodity markets and increased price co movement among different commodities we assess whether speculation in the oil market played a role in driving this salient empirical pattern we identify oil shocks from a large dataset using a dynamic factor model this method is motivated by the fact that a small scale vector autoregression is not informationally sufficient to identify the shocks the main results are as follows i while global demand shocks account for the largest share of oil price fluctuations speculative shocks are the second most important driver ii the increase in oil prices over the last decade is mainly driven by the strength of global demand however speculation played a significant role in the oil price increase between 2004 and 2008 and its subsequent collapse iii the co movement between oil prices and the prices of other commodities is mainly explained by global demand shocks our results support the view that the recent oil price increase is mainly driven by the strength of global demand but that the financialization process of commodity markets also played a role

globalisation and values this paper discusses a central element in globalisation debate little addressed by economists namely the interactions at global national and community levels between globalisation and societally based values social values refer to wider notions of collective identity religious values attitudes towards materialism moral beliefs and a sense of collective awareness and are a broader and more encompassing concept than social capital discussed in recent economics and sociology literature social capital relates to trust honesty and the social fabric of accepted norms central to the successful implementation of individual optimising decisions and denotes a communal asset reflecting strength of joint collective commitment whose amount can be increased or improved upon through investment of time and resources social values are much discussed in sociological literature going back to comte durkheim parsons and others the issues taken up here are how different social values might interact and change as societies and their economies integrate globalise processes of value competition displacement and joint assimilation occur naturally to economists but seem little studied by sociologists who seemingly place less stress on analytical comparative statics scenarios for how values can interact under globalisation are discussed in the text

new institutional economics in the post socialist transformation debate the paper suggests that there is a tension between the basic tenant of new institutional economics nie and the manner in which it has been applied in the debate on post socialist transformation this tension is explored in the context of four main perspectives on nie i property rights ii transaction costs economics iii new economic history and iv evolutionary economics there are two main arguments the first is that the transformation phase should be seen as open ended rather than a closed process where the pure market is the inevitable end result the second is that although the nie literature touches on most of the issues which are relevant to post socialist transformation the insights that it offers are still too general for policy guidance

efficiency of financial transmission rights markets in centrally coordinated periodic auctions electricity market design in the united states is increasingly dominated by locational marginal pricing lmp of energy and transmission lmp markets are typically coupled with periodic auctions of financial transmission rights ftrs to hedge transmission price risks while lmp designs offer considerable advantages forward price discovery in these markets requires participants to form efficient expectations on spot congestion price differences in this paper we examine trends in the efficiency of one of the early lmp markets the new york independent system operator nyiso analyzing a panel data set of over 9000 contracts over a six year period beginning september 2000 we show that nyiso ftr markets were inefficient in their early years but that market participants learned to predict forward prices and thus efficiency improved for ftrs not solely within the new york city long island sub region ftrs within this sub region which has a number of special characteristics remain relatively inefficient

limits to arbitrage in electricity markets a case study of miso abstract we study the case of financial traders in the midwest electricity market where they are expected to arbitrage price differences that result in inefficiencies using exogenous variation in financial trading from the financial crisis and a period of high transaction costs we show speculators had only a weak effect moreover while arbitrage was restricted by transaction costs imposed by regulation some financial players bet in exactly the opposite direction of the pricing gap sustaining large losses while doing so we show this is consistent with price manipulation intended to increase the value of a related instrument that bets on local price differences ftrs

corporate leadership multilevel enforcement and biodiversity regulation globalization incentives the rise of non state actors in unprecedented ways along with the creation of transnational arenas which are neither international intergovernmental nor national domestic but transborder political processes where firms non governmental organizations ngos states and social communities set up rules and provide governance mechanisms to enforce those at local level the article is anchored in the idea that public private governance matters where the primary driver is the market incentive we test the hypotheses that public private cooperation at local level is based on shared knowledge and expertise among firms civil society and state authority dealing with a natural resource which comes from the brazilian biodiversity ngos and companies have developed the ability to act as enforcers as they interpret the public international national regulation and develop an expertise through best practices that are applied to enforce biodiversity regulation at the local level through a multilevel system that operates transnationally

telecommunications and economic growth an empirical analysis of sub saharan africa we examine the effect of mobile cellular phones on economic growth in sub saharan africa where a marked asymmetry is present between land line penetration and mobile telecommunications expansion this study extends previous research along two important dimensions first we allow for the potential endogeneity between economic growth and telecommunications expansion by employing a special linear generalized method of moments gmm estimator second we explicitly model for varying degrees of substitutability between mobile cellular and land line telephony so that greater expansion of mobile telecommunications can have a different impact whenever the level of land line penetration differs we find that mobile cellular phone expansion is an important determinant of the rate of economic growth in sub saharan africa moreover we find that the contribution of mobile cellular phones to economic growth has been growing in importance in the region and that the marginal impact of mobile telecommunication service

the new institutional economics and its applicability to development abstract the several remarkable developments in the social sciences which have come to be known as the new institutional economics nie have not yet been fully exploited for analyzing the determinants and effects of institutional change in the context of development this paper identifies two important components of the nie and illustrates both a potential complementarities between them and b their applicability to various problems and policies in the long term development of developing countries

analysis on the growth of telecommunication services a global comparison of diffusion patterns with the development of the internet the telecommunication market has seen a rapid shift from voice based services to data based services relationships of substitutability and complementarity have emerged among communications technology services such as internet service mobile phone service and fixed telephone service the article analyses the diffusion patterns of communication services in different continents a modified logistic growth model is estimated using panel data for the years 1975 2004 the research forms a valuable framework for forecasting demand for new services based on the diffusion of incumbent services and can inform strategies for entering the communications network industry

divestiture and its implications for innovation and productivity growth in u s telecommunications this study has sought to determine the impact of policy changes that led to the breakup of the monopoly structure of u s telecommunications on productivity and research activities of at t a simultaneous equations model is used to examine the relationship between research intensity market share firm size and total factor productivity tfp before and after divestiture the results show that the effect of divestiture on productivity is negative but that competition has a significantly positive effect contrary to popular argument competition led to significant increases in r d investment by at t the study also finds a strong and positive relationship between r d and productivity in the postdivestiture period marked by its absence in the predivestiture years scale economies remain important indicating the industry continues to favor large firms

a comparative analysis of the use of information inputs in the manufacturing sectors of korea and japan abstract the paper examines the use of two information inputs information labor and purchased information services in korean and japanese manufacturing sectors in 1980 marginal products and substitution elasticities are calculated from translog production function estimates for the average manufacturing sector both inputs seem to be relatively more underused in korea second the elasticity estimates suggest several hypotheses about the growth of private bureaucracies in the two economies the results are unlikely to apply to other economies which have not yet attained an advanced industrial structure a simplistic stages theory of economic development based on the growth of the information labor force is rejected

an interpretive history of challenges to neoclassical microeconomics and how they have fared contemporary microeconomics has witnessed a resurgence of behavioral institutional and evolutionary critiques of the neoclassical mainstream that came to dominate the field during the 1980s today s critiques and proposals for reform have a long tradition in economics while synthesizing the intellectual history of these challenges this article explores the reasons why such critical strands of microeconomics fared poorly in the past and in contrast what factors may account for their partial acceptance into the mainstream in recent times

a heuristic joint replinishment policy for the case of heterogeneity among items abstract the q s s policy is considered among the best for solving the well known stochastic joint replenishment problem however it has some shortcomings if much heterogeneity exists among the items consequently a new heuristic control policy is constructed the cornerstone is a policy iteration improvement step assuming a single possibility for making a joint order and thus to deviate from the rule that the items are governed by independent re order and order up to s s policies but this policy iteration improvement step is done repeatedly at each demand epoch it is only required the development of one dimensional value functions of state variables in order to accomplish the policy iteration improvement step knowledge about good order up to values is important furthermore a relaxation parameter is introduced such that one can make it easier or more difficult to issue a joint order when following the policy iteration improvement step finally in case a joint order is made a vector of can order points is used to include additional items the policy is denoted a c s policy numerical results shows that the new policy performs significantly better than the q s s policy for cases with heterogeneity among items furthermore from a given optimal can order policy one can construct a better c s policy

a transitional institution for the emerging land market in urban china chinese economic reforms since 1978 have been a continuous process of fundamental institutional change the new institution of ambiguous property rights over state owned urban land evolves from the

transaction costs telecommunications and the microeconomics of macroeconomic growth the sources of differences in growth rates across nations are unclear this observation constitutes one of the central intellectual challenges of our time why is the whole world not developed consequently a host of scholars offer various explanations for growth or nongrowth including cultural factors politics and economics 2 the objective of this article is to determine whether a link exists between transaction costs telecommunications and economic growth the article builds on recent research on the macroeconomic determinants of growth as well as on research regarding the significant economic effects of telecommunications on transaction costs it is organized as follows section i reviews the theory of transaction costs section ii the link between transaction costs and telecommunications section iii contains the empirical analysis and section iv some conclusions

periodic versus can order policies for coordinated multi item inventory systems the coordinated multi item inventory problem refers to the problem of managing inventories where there is a joint fixed cost for replenishing plus an item by item fixed cost for each item included in the replenishment order given that the optimal solution is likely to be too complex attention has focused on fixed heuristics and in particular can order or s c s policies this paper makes two contributions first a new lower bound on the cost of the optimal policy is proposed in order that the performance of heuristics may be measured second motivated by the lower bound a simple periodic policy is proposed and shown to be an improvement over can order policies for many data sets

population growth and agriculture in poor countries a review of theoretical issues and empirical evidence abstract the paper contributes a critical survey of the very extensive literature dealing with various aspects of the economic and institutional responses of agriculture to population growth in poor countries encompassing a discussion of the main underlying theoretical issues such responses are evaluated in the framework of the general population development debate the main conclusion is that although population growth induces adjustments in agriculture in terms of technical progress intensification and definition of property rights optimism may not be justified in the context of very fast population growth and or already high densities especially when the environmental resource base is taken into account

revisiting legal realism the law economics and organization perspective the contrast between american legal realism which ran itself into the sand schlegel 1979 p 459 and the law and economics movement which is perhaps the most important development in legal thought in the last quarter century posner 1986 p xix is dramatic that the one foundered while the other flourished is explained in large measure by the absence of an intellectual framework for legal realism and the use by law and economics of the powerful framework of neoclassical economics

telecommunications infrastructure and economic development a simultaneous approach in diesem beitrag wird untersucht welchen einflus die telekommunikations infrastruktur auf die wirtschaftliche entwicklung ausubt diese wichtige frage hat im zusammenhang mit der diskussion um informationsautobahnen aktualitat erlangt in der vorliegenden studie wird der einflus der telekommunikations infrastruktur fur 21 oecdlander fur die vergangenen 20 jahre analysiert es wird ein strukturgleichungsmodell geschatzt in dem investitionen in die telekommunikations infrastruktur als endogene variable erfast werden und in einem mikromodell angebot und nachfrage nach telekommunikations investitionen spezifiziert werden das mikromodell wird dann zusammen mit der makro wachstumsgleichung geschatzt als ergebnis stellen die autoren dann eine positive kausalbeziehung zwischen telekommunikations investitionen und wirtschaftlicher entwicklung fest wenn eine kritische masse an telekommunikations infrastruktur existiert

coordinated replenishments in a multi item inventory system with compound poisson demands in many practical applications or multi item inventory systems significant economies of scale can be exploited when coordinating replenishment orders for groups of items this paper considers a continuous review multi item inventory system with compound poisson demand processes excess demands are backlogged and each replenishment requires a lead time there is a major setup cost associated with any replenishment of the family of items and a minor item dependent setup cost when including a particular item in this replenishment moreover there are holding and penalty costs we present an algorithm which searches for a simple coordinated control rule minimizing the long run average cost per unit time subject to a service level constraint per item on the fraction of demand satisfied directly from on hand inventory this algorithm is based on a heuristic decomposition procedure and a specialized policy iteration method to solve the single item subproblems generated by the decomposition procedure the model applies to multi location inventory systems with similar cost structures for coordinated deliveries

public sector capital and the productivity puzzle a number of studies have suggested a quantitatively important relationship between public sector capital accumulation and private sector productivity with the most compelling evidence derived from analyses of state level data estimates herein of production functions that use standard techniques to control for unobserved state specific characteristics however reveal essentially no role for public sector capital in affecting private sector productivity only estimates of state production functions that do not include such controls find substantial productivity impacts this result reconciles existing econometric estimates with the findings of hulten and schwab based on growth accounting techniques as such techniques effectively control for state specific effects region level estimates are essentially identical to those from state data suggesting no quantitatively important spillover effects across states copyright 1994 by mit press

short term forecasting of electricity prices for miso hubs evidence from arima egarch models this study estimates three time series models arima arima egarch and arima egarch m for hourly real time electricity prices for each of the five hubs of the midwest independent system operator miso and examines the in and out of sample forecasting performance of the respective models the results from the arima models reveal the presence of autoregressive conditional heteroskedasticity recognizing the possibility of asymmetric time varying volatility the egarch specification for the variance equation demonstrates the presence of an inverse leverage effect in electricity prices for each hub with respect to forecasts no one model clearly dominates the others in terms of in sample forecasting performance based on four forecast evaluation statistics however the arima egarch m model outperforms the other models michigan hub is the exception in terms of the out of sample forecasting performance

making sense of institutions as a factor shaping economic performance abstract there has recently been a resurgence of interest in how institutions affect economic performance a review of this literature reveals that the concept of an institution means different things to different scholars both within economics and across the social sciences we discuss what factors unify the different definitions of institutions and develop a concept of institutions useful for the analysis of economic performance and economic growth in particular specifically we develop the notion of institutions as standard social technologies economic growth results from the co evolution of physical and social technologies

telecommunications and economic growth a panel data approach telecommunication investment is increasingly identified as one with a strong potential to improve economic productivity and growth the objective of this study is to investigate the long run relationship between telecommunications infrastructure and economic growth using data from 22 oecd countries a dynamic panel data method is used for estimation which corrects for omitted variables bias of single equation cross section regression the fixed effects specification accounts for country specific differences in aggregate production functions the results show a significant and positive correlation between telecommunications infrastructure and growth after controlling for a number of other factors

externalities information costs and social benefit cost analysis for economic development an example from telecommunications the analytics of achieving a socially optimal allocation of investment resources has been a continuing problem in the field of economic development early work on this subject focused on externalities and on the need to include in the analysis a project s indirect promotional effects later research in what came to be called social benefit cost analysis sbca has added an emphasis on shadow prices on uncertainty and increasingly on income distribution effects 2 in principle these diverse concerns of social benefit cost analysis are complementary rather than competitive in the conditions of a less developed country ldc an investment project s side effects on income creation can be very significant 3 similarly an investment project s indirect impact on income distribution may also be substantial consequently an analysis incorporating externalities is necessary to take indirect social benefits and costs into account in practice however the more recent concerns of sbca have sometimes been accompanied by diminished interest in externalities 4 this paper presents an example that illustrates the importance of including externalities in considering both the efficiency and the equity consequences of investment choice our example analyzes the welfare effects of investment in telecommunications primarily telephone facilities in developing countries 5 investments that make available additional telephones in ldcs are often viewed as having welfare effects similar to increased availability of consumer durables like color television or air conditioning those goods are primarily an added convenience for the upper classes and their availability enlarges further the

is public expenditure productive abstract this paper considers the relationship between aggregate productivity and stock and flow government spending variables the empirical results indicate that i the nonmilitary public capital stock is dramatically more important in determining productivity than is either the flow of nonmilitary or military spending ii military capital bears little relation to productivity and iii a core infrastructure of streets highways airports mass transit sewers water systems etc has most explanatory power for productivity the paper also suggests an important role for the net public capital stock in the productivity slowdown of the last fifteen years

the impact of iso 9000 diffusion on trade and fdi a new institutional analysis the effects of iso 9000 diffusion on trade and foreign direct investment fdi have gone understudied we employ panel data reported by oecd nations over the 1995 2002 period to estimate the impact of iso adoptions on country pair economic relations we find iso diffusion to have no effect in developed nations but to positively pull fdi i e enhancing inward fdi and positively push trade i e enhancing exports in developing nations

cointegrating institutions the time series properties of country institutional measures abstracta country s political and economic institutions are critical for economic prosperity the literature abounds with institutional measures precisely because institutions are multidimensional we use panel unit root and cointegration tests to examine the time series properties of several institutional measures to answer two questions first do institutional changes tend to be permanent second which subsets of institutions tend to converge or move together these answers have important implications for whether permanent institutional reform is possible and whether reforms can be undertaken one institutional area at a time or instead must simultaneously encompass multiple institutional areas

impact of state and civil institutions on the operation of rural market and nonmarket configurations abstract the approach undertaken in this study is based on the concept of configurations configurations are shaped by specific combinations of characteristics of the following elements the item transacted the actors and the underlying physical technological cultural and policy environment configurations can be either market or nonmarket configurations in turn transactions are endogenously determined within given configurations the impact of government intervention on the performance of a number of prototypical rural configurations and agrarian institutions such as the food and cash crops market configurations the farm household sharecropping and the rural official and unofficial credit markets is evaluated critically

influences of transaction costs in environmental policy abstract there is a growing literature reporting the extent of transaction costs for environmental policies however understanding why transaction costs occur and why they are small or large is also important for efficient policy selection and evaluation following an analysis of the organisational economics literature and reports of the extent of transaction costs for a number of environmental policies three key influences to transaction costs in environmental policies are identified these are the following 1 the characteristics of the transaction for the environmental good 2 the nature of the transactors and 3 the current institutional environment and arrangements these affect transaction costs to the government and all other parties influenced by a policy transaction costs occur due to actions of information collection and policy design policy enactment and establishment implementation and contracting administration and monitoring and enforcement an interrogation of transaction cost influences reveals that 1 the influence varies between parties and is affected by the actions and interactions of and between all parties to a policy 2 how transaction costs are experienced varies across time and 3 who experiences transaction costs depends on the policy itself future policy selection and refinement will benefit from empirical analysis of the causes of transaction costs

calculating can order policies for the joint replenishment problem by the compensation approach abstract in this paper we consider the stochastic joint replenishment problem we coordinate the replenishment of an inventory with several items where the fixed cost of a replenishment consists of a major order cost for each order and a minor order cost for each item participating in the order the literature has focused on two kinds of policies can order policies and periodic replenishment policies generally speaking the can order policy performs better when the major ordering cost is relatively low and the periodic replenishment policies better when the major ordering cost is relatively high we present a new method for calculating can order policies which dominates existing methods on examples where the can order policy performs better than the periodic replenishment policies the method is based on a compensation approach where an item placing an order receives a compensation from other items benefitting from the order opportunity

a multi criteria evaluation framework for tradable white certificate schemes recent years have witnessed regained political momentum on energy efficiency and interest in establishing markets is growing as a result tradable white certificate twc schemes of differing design have been implemented in great britain italy and france much attention is being paid to justifying and evaluating such schemes in this paper we develop and apply a multi criteria framework for evaluating twc schemes an approach that attempts to cover their individual design features a broad evaluation is conducted regarding energy saving and environmental effectiveness economic efficiency cost effectiveness transaction costs political feasibility administrative burden and technical change the results show the design and performance of twc schemes to be case and context specific and generalisations are thus inappropriate this evaluation supports the cost effectiveness modelled for the british scheme and the assumption that a twc scheme is an economically efficient policy instrument for the other more complex twc schemes more data and experience are needed to judge their ex post merit on the whole the proposed multi criteria evaluation requires considerable data and complementary methods however the framework improves the understanding of the broad effects and attributes of twc schemes it deals with various empirical and normative aspects that can be applied in their evaluation