where has all the bias gone detecting gender bias in the intrahousehold allocation of educational expenditure abstract the reliability of the household consumption based engel curve methodology in detecting gender bias has been called into question because it has generally failed to confirm bias even where it exists this article seeks to find explanations for this failure by exploiting a data set that has educational expenditure information at the individual level and also by aggregation at the household level i find that in the basic education age groups the discriminatory mechanism in education is via differential enrollment rates for boys and girls education expenditure conditional on enrollment is equal for boys and girls the engel curve method fails for two reasons first it models a single equation for the two stage process second even when we make individual and household level expenditure equations as similar as possible the household level equation still fails to pick up gender bias in about one third of the cases where the individual level equation shows significant bias this article

cycles in politics wavelet analysis of political time series spectral analysis and arma models have been the most common weapons of choice for the detection of cycles in political time series controversies about cycles however tend to revolve around an issue that both techniques are badly equipped to address the possibility of irregular cycles without fixed periodicity throughout the entire time series this has led to two main consequences on the one hand proponents of cyclical theories have often dismissed established statistical techniques on the other hand proponents of established techniques have dismissed the possibility of cycles without fixed periodicity wavelets allow the detection of transient and coexisting cycles and structural breaks in periodicity in this article we present the tools of wavelet analysis and apply them to the study of two lingering puzzles in the political science literature the existence of cycles in election returns in the united states and in the severity of major power wars

tax spend spend tax or fiscal synchronization a wavelet analysis in this article we use wavelet methodology to analyse the long term relationship between spending and taxes unlike the standard methodology that utilizes unit roots and cointegration with or with

allocation of fixed transmission cost to wheeling transactions by cooperative game theory this paper describes a methodology to allocate the cost of transmission network facilities to wheeling transactions in decentralized power systems the authors propose that the responsibility placed on transmission facilities involved in each transaction be according to the transmission usage pattern their proposal incorporates the mw mile method and considers economies of scale of transmission network facilities they also incorporate a nucleolus scheme in the cooperative game theory to deal with matters of conflict the applicability of their method is demonstrated in a numerical example

discovering price load relationships in california s electricity market this paper reports on characterizing recent price behavior in the califomia electricity market market participants that is producers consumers and traders are highly motivated by the potential for profits to develop strategies to explore and exploit the limits of system operation these strategies should be reflected in the market as different price to load relationships we show that a number of regimes i e characteristic behaviors exist in the price time series and provide a brief analysis of each regime knowledge of the number of regimes their characteristics and switching dynamics allows insight into the market and power system performance

cycles in american national electoral politics 1854 2006 statistical evidence and an explanatory model are there cycles in american politics in particular does the proportion of the democratic republican vote share for president and or seat share in congress rise and fall over extended periods of time if so are the cycles regular and what are the cycling periods moreover if there are regular cycles can we construct an integrated model such as a negative feedback loop that identifies political forces that could generate the observed patterns first we use spectral analysis to test for the presence and length of cycles and show that regular cycles do in fact exist with periods that conform to those predicted by the schlesingers for swings between liberalism and conservatism but with durations much shorter than those most commonly claimed by burnham and others in characterizing american political realignments second we offer a voter party interaction model that depends on the tensions between parties policy and office motivations and between voters tendency to sustain incumbents while reacting against extreme policies we find a plausible fit between the regular cycling that this model projects and the time series of two party politics in america over the past century and a half

natural natural experiments in economics the recent literature exploiting natural events as natural experiment instruments is reviewed to assess to what extent it has advanced empirical knowledge a weakness of the studies that adopt this approach is that the necessary set of behavioral market and technological assumptions made by the authors in justifying their interpretations of the estimates is often absent the methodology and findings from twenty studies are summarized and simple economic models are used to elucidate the implicit assumptions made by the authors and to demonstrate the sensitivity of the interpretations of the findings to the relaxation of some of these assumptions

utility cogenerator game for pricing power sales and wheeling fees the authors have studied an extensive game model of an electricity market where a cogenerator sells excess electricity to an electric utility or to an end user they found that a buy back system the utility purchases cogenerated power is as efficient as a cogenerator customer wheeling system and that these two systems are more desirable than a monopoly system for the regulator the buy back rate should be equal to lp bargaining solution or less than nash bargaining solution the marginal cost of the electric utility they also conducted an analysis of a two period electricity market in which they found that the cogenerator that can supply excess power during peak period obtains the market advantage

transmission access and pricing with multiple separate energy forward markets california s congestion management protocols provide comparable access and prices to all users of the transmission system power exchange and bilateral contract parties the users implicitly bid for capacity on major transmission paths between zones the independent system operator iso allocates the available transmission capacity on these paths so that it maximizes the value of this capacity as measured by the users bids everyone scheduling flow on a congested path is charged the marginal cost based price for using the path the iso keeps each party s portfolio of generation and load individually in balance when adjusting schedules to relieve congestion on interzonal paths by keeping the portfolios of the different parties separate the iso clears its transmission market without arranging energy trades between parties parties are responsible for arranging their own trades the iso does not become involved in the energy forward markets

an integrated framework for cost allocation in a multi owned transmission system this paper describes a methodology for allocating transmission costs among users of a centralized transmission service in the proposed approach the share of each participant is proportional to its impact on power system transmission investment requirements this allocation rule provides incentives for all participants to remain in the pool and ensures revenue reconciliation it is shown that under some simplifying assumptions the proposed scheme reduces to a modified mw mile rule thus providing some insight on that method s economic basis other issues such as credits for counterflows and distortions due to economies of scale are also addressed the methodology is illustrated in case studies with the brazilian power system

intrahousehold resource allocation in rural pakistan a semiparametric analysis we estimate semiparametric engel curves for rural pakistan using a large household survey this allows us to obtain consistent estimates of the effects of household size and composition on consumption patterns even when these demographic variables are correlated with an unknown function of income the coefficients on the household composition variables are used to infer patterns of intrahousehold allocation while there is little evidence of gender bias amongst children adult males appear to get more than adult females there is a tendency amongst males for workers to get more than dependents there is no evidence of differential treatment of the elderly and higher birth order children we identify substantial economies of size in food consumption we also find that engel curces for food adult goods and child goods are nonlinear which suggests that the piglog class of demand models in inappropriate

marginal pricing and supplement cost allocation in transmission open access the application of marginal costing to transmission pricing in open access schemes requires the collection of a supplement to finance the transmission systems the paper describes the application of marginal cost based pricing in the chilean power system and the difficulties faced in allocating the supplement among parties involved alternative methods for defining the allocation are formulated generalized generation and load distribution factors for cost allocation are formulated and implemented the methods are applied to allocate payments for transmission services provided by the transmission network and by a distribution company

the progress of school education in india this paper provides an overview of school education in india first it places india s educational achievements in international perspective particularly against countries with which it is now increasingly compared especially china second the paper examines schooling access in terms of enrolment and school attendance rates and schooling quality in terms of literacy rates learning achievement levels school resources and teacher inputs third the paper investigates the role of private schooling in india examining the extent of growth of private schooling and surveying evidence on the relative effectiveness and unit costs of private and public schools last the paper discusses some major public education initiatives the concluding section suggests a future research agenda and appeals for rigorous evaluation of the impacts and costs of the numerous existing educational interventions in order to learn about their relative cost effectiveness for evidence based policy making

equitable allocation of congestion relief cost to transactions this paper investigates a bid based congestion management scheme for a system that accommodates many bilateral transactions the paper proposes a new allocation method for allocating the cost of congestion relief to transactions that cause the congestion the allocation reflects the actual usage of the congested facilities by the transactions and recovers the cost also proposed in the paper is a consistency test to quantify and test the equity fairness of the method test results illustrate that the method provides better price signals for relieving congestion on lines than the shadow prices the test results also indicate that the method recovers the cost the results on consistency indicate that the proposed method is consistent provided that the transactions causing counterflows on congested lines be compensated

regime cycles democracy autocracy and revolution in post soviet eurasia research on regime change has often wound up chasing events in the post soviet world because it has frequently assumed that regime change if not simple instability implies a trajectory toward a regime type endpoint like democracy or autocracy a supplemental approach recognizes that regime change can be cyclic not just progressive regressive or random in fact regime cycles are much of what we see in the postcommunist world where some states have oscillated from autocracy toward greater democracy then back toward more autocracy and with recent colored revolutions toward greater democracy again an institutional logic of elite collective action focusing on the effects of patronalpresidentialism is shown to be useful in understanding such cyclic dynamics explaining why revolutions occurred between 2003 and 2005 in ukraine georgia and kyrgyzstan but not in countries like russia azerbaijan and uzbekistan

advanced pricing in electrical systems i theory this paper sets forth a comprehensive theory for the real time pricing of electricity that includes selected ancillary services and extends the theory to incorporate constraints on power quality and environment impact that often influence the operation of a power system this paper is part i of a two paper set it sets forth the mathematical development of the extended model for real time pricing the formulation is novel in that it combines the dynamic equations for load frequency control with the static equations of a constrained optimal power flow part ii derives optimal nodal specific real time prices for both real and reactive power the prices derived include additive premia or opportunity costs reflecting the effects of voltage regulation maintenance of generation and transmission reserves regulation of frequency and tie line flows removal and or control of power harmonics and others

is it better to be a boy a disaggregated outlay equivalent analysis of gender bias in papua new guinea the demographic evidence of gender bias in many countries has provided an impetus for finding ways to study the status of women in developing countries because of the lack of accurate intra household data deaton 1989 introduced a method for using household expenditure data to infer discrimination in the allocation of goods between boys and girls few studies of discrimination using the method however have detected bias even though alternative indicators suggest it is a serious problem in this paper we study the case of papua new guinea a country in which there are many indicators of severe gender bias discrimination in the allocation of goods between boys and girls within households in papua new guinea is examined using deaton s outlay equivalent ratio method adding a boy to the household reduces expenditure on adult goods by as much as would a nine tenths reduction in total outlay per member but girls have no effect on adult goods expenditure the hypothesis of haddad and reardon 1993 that

reconsidering gender bias in intrahousehold allocation in india abstract finding evidence of gender discrimination among children in the intrahousehold allocation of goods has often proven to be difficult this article uses data on education expenditures in india to test whether data aggregation data reliability and the statistical method used help explain this pattern results suggest that discrimination against girls is increasing in age and robust to the statistical method and the expenditure measure at the all india level although state level results are more sensitive i find that data aggregation and statistical method are important factors in detecting gender bias while data reliability does not seem to play a major role

allocation of transmission losses to bilateral contracts in a competitive environment under open access market driven transactions have become the new independent decision variables defining the behavior of the power system understanding the impact of bilateral transactions on system losses is important to be able to allocate a loss component to each individual transaction and improve economic efficiency the theory presented here is based on the argument that it is always possible to compute the exact loss allocation corresponding to an infinitesimal bilateral transaction this leads to a set of governing differential equations whose solution yields the loss allocation for contracts of any size several examples illustrate the properties of both the proposed allocation equations and other methods the dependence of the proposed solution on the path of integration and a number of implementation issues

wheeling rates of reactive power flow under marginal cost pricing wheeling is the transmission of electrical power and reactive power from a seller to a buyer through a transmission network owned by a third party the wheeling rate is an area of intense research in view of increased deregulation this paper uses a wheeling rate based on marginal cost pricing and implemented using a modification of the optimal power flow opf a case study based on the ieee 30 bus system illustrates the magnitudes and ranges that wheeling rates might have in different circumstances special attention is paid to reactive wheeling which cannot be analyzed with a dc model used by previous authors the ratio of wheeling rates between real and reactive flow shows the importance of the latter the paper also discusses the significance of this for the trade off between paying for reactive wheel or investing in compensating plant

a load flow based method for calculating embedded incremental and marginal cost of transmission capacity this paper describes the principles of a load flow based method for allocating the cost of transmission capacity the method estimates the usage of each transmission facility with cost defined on a per facility basis embedded incremental and marginal cost of transmission capacity are defined and compared to each other a discussion of other load flow based methods and their application to marginal cost is included

gender and household education expenditure in pakistan pakistan has very large gender gaps in educational outcomes one explanation could be that girls receive lower educational expenditure allocations than boys within the household but this has never convincingly been tested this article investigates whether the intra household allocation of educational expenditure in pakistan favours males over females it also explores two different explanations for the failure of the extant engel curve studies to detect gender differentiated treatment in education even where gender bias is strongly expected using individual level data from the latest household survey from pakistan we posit two potential channels of gender bias bias in the decision whether to enrol keep sons and daughters in school and bias in the decision of education expenditure conditional on enrolling both sons and daughters in school in middle and secondary school ages evidence points to significant pro male biases in both the enrolment decision as well as the decision of how much to spend conditional on enrolment however in the primary school age group only the former channel of bias applies results suggest that the observed strong gender difference in education expenditure is a within rather than an across household phenomenon

transmission access pricing to wheeling transactions a reliability based approach due to economy of scale several methodologies for the allocation of power transmission costs do not recover the fixed costs of transmission assets to avoid this problem in this paper a methodology is proposed which considers that each circuit has two functions to allow the power transmission between two points and to assure the system reliability thus the revenue of each circuit is obtained in two parts one part that considers the system use under normal state and the second part that consider the system use under contingency conditions application of the methodology is illustrated on a small but realistic test system

okun s law across time and frequencies abstract we present the first assessment of u s okun s law across time and frequencies we use a set of continuous wavelet tools that allows for estimating okun s coefficient and the lead lag of output over unemployment at each moment and for each cyclical frequency we find similar results for the gaps and the first differences specifications at business cycles frequencies but not at lower frequencies okun s coefficient has increased in absolute value since the mid 1960s except in 1985 1995 and is not particularly sensitive to recessions the lead of output varies considerably over time and also at different frequencies we observe especially with the gaps specification that there are at least two cyclical processes relevant for the okun s relationship one at the business cycle and another at lower frequencies methods that do not take this into account are bound to mix the information embedded in both cycles

does higher government debt link to higher social expenditure new method new evidence abstractscholars believe that higher social expenditures are usually linked with higher government debts whereas higher debts reduce social expenditures however it is reasonable to speculate that higher government debt may contribute to higher social spending while fiscal deficits occur during a recession which commonly creates greater demand for social expenditure for a deeper investigation this paper revisits the dynamic relationship between social spending and public debts in the time frequency domain using the novel wavelet coherency analysis as well as the phase difference technique to derive the co moved and causal relationships between social spending and public debts in 13 oecd countries the evidence identifies a dynamic relationship between variables while higher social expenditures increase government debts the shocks from government debts to social expenditures are conversely uncertain we discover that higher government debt does reduce social expenditures but it may be linked to h

the effects of the gender of children on expenditure patterns in rural china a semiparametric analysis we analyse expenditure patterns for rural china focusing on differences between families with boys and girls the sample includes more than 5000 nuclear families from 19 chinese provinces following the existing literature we estimate engel curves for food and for alcohol a typical adult good we use a flexible partially linear specification and allow for endogeneity of total expenditures the results are similar to those of other studies not providing much evidence of gender differentials we then focus on the decision to send a child to school and on the budget share spent on educational goods using both parametric and semiparametric estimates we find evidence that boys are more often sent to school and that expenditures on a boy that goes to school are larger than for a school going girl of the same age copyright 2005 john wiley sons ltd

the public as thermostat dynamics of preferences for spending theory democratic accountability requires that the public be reasonably well informed about what policymakers actually do such a public would adjust its preferences for more or less policy in response to policy outputs themselves in effect the public would behave like a thermostat when the actual policy temperature differs from the preferred policy temperature the public would send a signal to adjust policy accordingly and once sufficiently adjusted the signal would stop hypotheses in domains where policy is clearly defined and salient to the public changes in the public s preferences for more policy activity are negatively related to changes in policy methods a thermostatic model of american public preferences for spending on defense and a set of five social programs is developed and then tested using time series regression analysis results changes in public preferences for more spending reflect changes in both the preferred levels of spending and spending decisions themselves most importantly changes in preferences are negatively related to spending decisions whereby the public adjusts its preferences for more spending downward upward when appropriations increase decrease thus consistent with the eastonian model policy outputs do feed back on public inputs at least in the defense spending domain and across a set of social spending domains

revenue reconciled optimum pricing of transmission services this paper describes a methodology for evaluating an optimal set of transmission prices to be charged for use of a transmission system on a time of use basis the transmission prices are determined by maximising the global benefit of using the transmission system that allocates both capacity and operational costs the security considerations are explicitly taken into account by incorporating security factors in the algorithm the important issue of revenue recovery by the transmission utility is addressed by modifying the optimum prices without affecting the consumer behaviour this can be achieved by setting the prices within indifference intervals over which consumers are insensitive to transmission prices application of the methodology is illustrated on the ieee 24 bus test system

gender bias credit constraints and time allocation in rural india this paper examines the impact of a child s gender on the time allocation of rural indian households for the five year period subsequent to its birth a theoretical model generates predictions for the effect of the birth of a boy relative to a girl i e the gender shock on household behaviour when the household is liquidity constrained and when it is not the results from the empirical analysis are consistent with the case in which poorer households are liquidity constrained and less poor households are not the interpretation of the finding that women in both groups of households work less subsequent to the birth of a boy relative to a girl differs in these two cases

looking for boy girl discrimination in household expenditure data the ability to test for discrimination in the allocation of goods between boys and girls is hampered by a lack of data on intrahousehold distribution the analysis presented here allows inferences about intrahousehold allocation to be made from householdlevel expenditure data for a given level of income families with children will spend less on adult goods in order to purchase children s goods if household purchasing favors boys over girls smaller expenditures on adult goods would be made by families with boys as compared with those with girls a method for determining adult goods is described and the procedure for detecting gender bias is applied to data from c6te d lvoire and thailand the data show no evidence of discriminatio n between boys and girls in c6te d lvoire and a small and statistically insignificant bias in favor of boys in thailand how commodities are allocated among the members of a household has recently occasioned a good deal of interest assessments of poverty and income distribution based on household incomes or expenditures will be misleading if allocation within the household is unequal the position of women and girls has been of particular concern and there is a considerable amount of empirical evidence much of it from the indian subcontinent that documents discrimination against females see in particular bhagwati 1973 sen 1984 sen and sengupta 1983 miller 1981 bardhan 1982 and kynch and sen 1983 as well as survey papers by behrman 1987 and harriss 1987 much of the evidence is concerned with measurements of nutritional outcomes mortality and health status rather than with the direct allocation of goods by gender the difficulty in trying to determine the intrahousehold allocation of goods is that household budget surveys the obvious source of data record consumption not of individuals but of households and while attempts can be made to the author is a professor of public affairs and of economics and international affairs at princeton university and is a consultant to the population and human resources department of the world bank the author thanks dwayne benjamin who provided for excellent research assistance he is grateful to him and to members of the economic growth center at yale university for helpful comments this is a revised and shortened version of living standards measurement study working paper 39 the allocation of goods within the household adults children and gender june 1987 the results from thailand were not included in the working paper 1989 the international bank for reconstruction and development the world bank

transmission congestion management in an electricity market managing transmission congestion in an unbundled electric power system poses a challenge to an independent system operator iso this paper considers an open transmission dispatch environment in which pool and bilateral multilateral dispatches coexist and proceeds to develop a congestion management strategy for this scenario prioritization of electricity transactions and related curtailment strategies are explored and a mechanism for coordination between market participants to achieve additional economic advantages is described

son preference and household income in rural china why is it that couples who have a son or whose last child is a son earn higher conditional income to solve this curious case we tell a detective story evidence of a phenomenon to be explained a parade of suspects a process of elimination from the enquiry and then the denouement given the draconian family planning policy and a common perception that there is strong son preference in rural china we postulate two main hypotheses income based sex selection making it more likely that richer households have sons and an incentive for households with sons to raise their income tests of each hypothesis are conducted taken as a whole the tests cannot reject either hypothesis but they tend to favour the incentive hypothesis and there is evidence in support of the channels through which the incentive effect might operate to our knowledge this is the first study to test these hypotheses against each other in rural china and more generally in developing countries

uniform marginal pricing for the remuneration of distribution networks a new method for distribution access via uniform pricing for the remuneration of distribution networks is presented the proposed approach merges in a unified framework the investments the optimal network operation requirements the effect of the price elasticity of demand and the application of hourly pricing for demand side management purposes hourly uniform marginal prices understood as tariffs of use of the network are obtained from maximum social welfare condition sending efficient signals to the utility and consumers related to the optimal operation of the grid and use of the energy at peak and valley hours this method is used in the context of a performance based ratemaking regulation to get model companies from operational optimized real networks capital fees are integrated in the marginal tariff of use by means of the new replacement value concept broadly used in yardstick competition the model is stated as a mixed integer linear optimization problem suitable to be solved through well known linear programming tools the methodology has been successfully tested in a 42 bus test distribution network

short term transmission line maintenance scheduling in a deregulated system in this paper the authors present a decomposition approach based on duality theory for line maintenance scheduling with transmission and voltage constraints the given formulation consists of a master program and sub problems with two independent programming in the master problem the maintenance problem is solved and in the subproblems the transmission and voltage problems are solved independently since canceling a transaction or purchasing reactive power relates to the loss of revenue the trade off between maintenance cost and revenue loss will be optimized in the proposed method the test results on the modified ieee 118 bus system demonstrate that limits on transmission and voltage affect the line maintenance scheduling and increase the maintenance cost while introducing the loss of revenue as one of the objective functions the proposed method is flexible enough to accommodate various pricing objectives and methods

long run incremental cost pricing based on unused capacity this paper proposes a novel approach for providing long run incremental cost lric pricing in network charges the proposed approach makes use of the unused capacity of an exiting network to reflect the cost of advancing or deferring future investment consequent upon the addition of generation or load at each study node on a distribution network compared with existing approaches to lric pricing the proposed approach produces forward looking charges that reflect both the extent of the network needed to service the generation or load and the degree to which that network is utilized the efficacy of the proposed lric approach has been validated by a comparison with the established investment cost related pricing icrp method used for deriving transmission charges in great brain gb this paper draws on work undertaken in projects for western power distribution and ofgem office of gas and electricity markets u k however the views expressed in this paper are those of the authors

factoring the elasticity of demand in electricity prices as electricity markets are liberalized consumers become exposed to more volatile electricity prices and may decide to modify the profile of their demand to reduce their electricity costs this paper analyzes the effect that the market structure can have on the elasticity of the demand for electricity it then describes how the consumers behavior can be modeled using a matrix of self and cross elasticities it is shown how these elasticities can be taken into consideration when scheduling generation and setting the price of electricity in a pool based electricity market these concepts are illustrated using a 26 generator system

probabilistic game approaches for network cost allocation in a restructured power market the network cost is to be allocated between multiple players utilizing the system in varying capacities cooperative game approaches based on shapley value and nucleolus provide stable models for embedded cost allocation of power networks varying network usage necessitates the introduction of probabilistic approaches to cooperative games this paper proposes a variety of probabilistic cooperative game approaches these have variably been modeled based upon the probability of existence of players the probability of existence of coalitions and the probability of players joining a particular coalition along with their joining in a particular sequence application of these approaches to power networks reflects the system usage in a more justified way consistent and stable results qualify the application of probabilistic cooperative game approaches for cost allocation of power networks

the long term impact of transmission pricing transmission pricing has been one of the major issues on the ongoing debate about deregulation and privatization many papers have dealt with the static nature of the tariff using the incremental and the embedded cost approaches however few of them have focused on the dynamic aspects of the tariff and therefore on its impact on the long term expansion planning of both generation and transmission the main target of this paper is to address some interesting topics about the effect of the transmission pricing methods on system cost in this new environment where generation is treated as an open market and transmission as a monopoly some examples with the brazilian power system illustrate the main points shown in this paper

change and stability in superpower rivalry we investigate the dynamics of superpower rivalry participants in policy debates within each state use information about expected future threats and economic costs to influence other policy actors and this process of sophisticated reaction links the security policies of these two states into a single rivalry system analysis of vector autoregression models of u s and soviet military expenditures and diplomatic hostility and u s gross national product supports the hypothesis that these policies approximate the behavior of unitary rational states capable of forming rational expectations of each other s future behavior the dynamic response of this system to a wide range of exogenous shocks or innovations reveals the underlying stability of this rivalry system the military expenditures of both states exhibit a cyclical response to innovations with a shorter u s cycle this lack of synchronization creates several problems for analysis and for policy change

economies of scale household size and the demand for food household scale economies are plausibly attributed to shared household public goods that make larger households better off at the same level of per capita resources larger households should therefore have higher per capita consumption of private goods such as food provided that they do not substitute too much toward the effectively cheaper public goods the evidence shows exactly the opposite data from rich and poor countries indicate that at constant per capita total expenditure the per capita demand for food decreases with household size and that it does so most in the poorest countries where substitution should be the least

marginal pricing of transmission services an analysis of cost recovery this paper presents an in depth analysis of network revenues computed with marginal pricing and in particular it investigates the reasons why marginal prices fail to recover the total incurred network costs in actual power systems the basic theoretical results are presented and the major causes of the mismatch between network costs and marginal revenues are identified and illustrated with numerical examples some tutorial and others of realistic size the regulatory implications of marginal network pricing in the context of competitive electricity markets are analyzed and suggestions are provided for the meaningful allocation of the costs of the network among its users

optimization based bidding strategies in the deregulated market with the deregulation of electric power systems market participants are facing an important task of bidding energy to an independent system operator iso this paper presents a model and a method for optimization based bidding and self scheduling where a utility bids part of its energy and self schedules the rest as in new england the model considers iso bid selections and uncertain bidding information of other market participants with appropriately simplified bidding and iso models closed form iso solutions are first obtained these solutions are then plugged into the utility s bidding and self scheduling model which is solved by using lagrangian relaxation testing results show that the method effectively solves the problem with reasonable amount of cpu time

wheeling of power under deregulated environment of power system a bibilographical survey the power industry is moving rapidly from regulated conventional setup to a deregulated environment there is an urgent need to keep a track of international experiences and activities taking place in this emerging field this paper gives a bibliographical survey and general backgrounds of research and development in the field of power system wheeling under deregulated environment based on over 170 published articles wheeling in general and the establishment of wheeling rate in particular are subjects of extensive debate today this will be very much useful for all countries especially those developing countries which are moving toward the unbundling of electricity supply industry esi the collected literature have been divided into many section so that new researchers do not face any difficulty for obtaining literature particularly in the area of wheeling of power under deregulated environment

dynamic conditional correlations in political science time varying relationships and volatility are two methodological challenges that are particular to the field of time series in the case of the former more comprehensive understanding can emerge when we ask under what circumstances relationships may change the impact of context such as the political environment the state of the economy the international situation etc is often missing in dynamic analyses that estimate time invariant parameters in addition time varying volatility presents a number of challenges including threats to inference if left unchecked among time varying parameter models the dynamic conditional correlation dcc model is a creative and useful approach that deals effectively with over time variation in both the mean and variance of time series the dcc model allows us to study the evolution of relationships over time in a multivariate setting by relaxing model assumptions and offers researchers a chance to reinvigorate understandings that are tested using time series data we demonstrate the method s potential in the first example by showing how the importance of subjective evaluations of the economy are not constant but vary considerably over time as predictors of presidential approval a second example using international dyadic time series data shows that the story of movement and comovement is incomplete without an understanding of the dynamics of their variance as well as their means

optimal multi area wheeling an important consideration in wheeling is where a transaction involves several parties that is multi area wheeling power from seller to buyer flows through several intermediate utilities each utility represents an individual control area engaged in part of a more complex wheeling transaction individual wheeling rates then have to be computed for each area the question of how much energy should be transported through each path and what wheeling price should be paid is then an issue of importance this is formulated as a nonlinear optimisation program with linear constraints and solved by a gradient projection method the availability of facts capability to implement the optimal wheeling strategy once determined is assumed in this paper

marginal pricing of transmission services a comparative analysis of network cost allocation methods a strict marginal network pricing policy is not able to generate enough revenues to recover the cost of the primary transmission service other related network services are ignored here this cost recovery problem requires the stipulation of a complementary charge which completes the network marginal revenues this paper evaluates numerically and qualitatively three different allocation methods of the complementary charge marginal participation factors mean participation factors and benefit factors the evaluation has been applied to the spanish electrical system model

intrahousehold allocation of education expenditure the case of sri lanka abstract this article uses conventional engel curve demand analysis as well as a double hurdle model to explore whether there are intrahousehold differentials in the allocation of education expenditure between boys and girls in rural sri lanka contrary to the case in most developing countries in sri lanka there was a significant bias favoring girls for 1990 91 and 1995 96 for age group categories 8 9 14 16 and 17 19 and in 2000 for age group categories 14 16 and 17 19 significant differences in enrollment favoring girls aged 17 19 explain part of the girl bias observed in 1990 91 and 2000 2001 but most of the bias is driven by positive expenditure given enrollment the biases favoring girls are observed at critical stages of the schooling career in the run up to key national exams the 8 9 age group captures the run up to the year 5 scholarship exams that are used to gain entry to the better performing secondary schools the 14 16 and 17 19 age groups capture those who read for important nationa

reactive power as an ancillary service this paper addresses the problem of reactive power procurement by an independent system operator iso in deregulated electricity markets a reactive bid structure is proposed in the context of a reactive power market based on the reactive power price offers and technical constraints involved in reactive power planning a two tier approach is developed to determine the most beneficial reactive power contracts for the iso the reactive capability of a generator and therefore the opportunity costs in providing reactive power is also included in the model uncertainty in reactive demand and in reactive bids of participating parties is incorporated through monte carlo simulations and the expected reactive power procurement plan for the iso is hence determined the cigre 32 bus network approximately representing the swedish system is used for the studies

cost of wheeling methodologies the cost of wheeling and the methodology by which it is computed is a high priority problem throughout the power industry due to the growth in transmission facilities the cost differentials between utility companies and the dramatic growth in nonutility generation capacity this paper contains descriptions and summaries of computational procedures and data requirements of four embedded cost methodologies two long run incremental cost methods and the short run marginal cost method four methodologies are also presented for allocating the wheeling costs among a number of wheels when simultaneously present on a company s system as required for the standard long run incremental cost method

on the cyclicity of regional house prices new evidence for u s metropolitan statistical areas abstract this paper is mainly concerned with the analysis of regional house price cycles we introduce a wavelet transform based metric to study the housing cycle synchronization across the largest u s msas with a focus on the recent housing bubble we derive several conclusions i we show that regional housing cycle dissimilarities are significantly and strongly connected to geography ii after the burst of the recent housing bubble there was greater significant co movement in shorter cycles for a short period of time iii coastal regions which have a higher house price volatility compared to other msas are also those with a higher degree of house supply regulation iv a mortgage rate reduction decrease the dissimilarity between the msas and the national housing cycle before the end of 2006 at higher frequencies hence monetary policy is partially effective whereas effectiveness depends on time frequency and the considered msa

the costs of wheeling and optimal wheeling rates wheeling is the transmission of electrical energy from a buyer to a seller through a transmission network owned by a third party this paper provides a theoretically sound yet practical to implement basis for setting wheeling rates these wheeling rates are based on marginal costs determined by losses and effects of line flow and voltage magnitude constraints adjusted up or down as necessary to account for embedded capital costs i e revenue reconciliation simple numerical examples are provided to illustrate interesting phenomena such as negative wheeling rates which yield positive net revenue comparisons with present day wheeling rates show that major differences exist the wheeling rates of this paper yield a no lose situation for the buying selling and wheeling utilities

evaluation of wheeling and nonutility generation nug options using optimal power flows the application of optimal power flow for the evaluation of wheeling and nonutility generation nug related options is presented both wheeling and nug options affect vital attributes such as system security voltage profile losses and var reserves these options put a strain on the existing transmission system and may restrict economic utility dispatching optimal power flows may be used to determine the best control settings to accommodate wheeling or nug options so as to maintain system security while minimizing losses or production cost short term marginal wheeling costs may be derived using optimal power flows case studies involving the northeast utilities and ieee test systems are presented these cases show that optimal power flows can be used effectively to address a broad range of wheeling or nug related planning issues

a guide to wavelets for economists abstract wavelet analysis although used extensively in disciplines such as signal processing engineering medical sciences physics and astronomy has not fully entered the economics discipline yet in this survey article wavelet analysis is introduced in an intuitive manner and the existing economics and finance literature that utilizes wavelets is surveyed and explored extensive examples of exploratory wavelet analysis are given most using canadian us and finnish industrial production data finally potential and possible future applications for wavelet analysis in economics are discussed

feasibility assessment of simultaneous bilateral transactions in a deregulated environment a large number of transmission transactions is expected to take place with the introduction of competition into the electricity industry these transactions need to be evaluated ahead of their scheduling time to check their feasibility with regard to the system conditions at the time of scheduling transmission system operators would have to honor and execute only transactions as far as the system design and system operating conditions permit this paper describes a method for assessing the feasibility of simultaneous bilateral transactions with regard to the system economic dispatch and transmission system constraints transactions are classified into feasible and unfeasible feasible transactions can be accommodated without violating the system economic dispatch and transmission network constraints unfeasible transactions violate transmission network constraints and can not be accommodated fully without altering the system economic dispatch the assessment method provides information on where and how much generation is to be rescheduled in order to accommodate an unfeasible transaction such information will be useful in deciding whether a particular unfeasible transaction is worth serving or not the ieee reliability test system rts is used to illustrate the assessment method

children and household economic behavior this paper looks at some of the methodological issues that arise in modeling the effects of children on household behavior and presents some estimates for selected areas for our purposes household behavior will be taken to refer to household decisions on labor supply the allocation of expenditure to different periods and the decision as to what to do with the difference between income and expenditure i shall be concerned mainly with the effects of dependent children and i restrict attention largely to western societies excerpt

framework for assessing the economic efficiencies of long run network pricing models this paper presents a framework for assessing the economic efficiency of different long run network pricing models the aim is to provide a quantifiable efficiency measure that will inform regulators network operators and network users when an alternative pricing model is contemplated the efficiency measure is derived from the long term network development costs that flow from a dynamic interaction between network pricing and planning that is the response of network users to differing charging models the consequential network investment and new financial incentives that follow reinforcement of the network to illustrate the approach the framework has been used to assess the relative efficiency of three broad class of distribution pricing models in a study undertaken for the great britain gb s regulator for gas and electricity markets in england wales and scotland ofgem the study contemplated three pricing models that are used in practice the efficiency assessment in the ofgem study was conducted on a pseudo distribution reference network on the assumption that the results from the reference network could be scaled up to the national level then the assessment suggests that by moving from the present drm model to the more economic lric approach gb distribution network operators could save in the region of pound200 m over the next 20 years in their network investment costs this paper draws heavily on the project undertaken for ofgem but any views expressed are solely those of the authors

generation scheduling in a deregulated system the norwegian case the paper gives an overview of the deregulated electricity supply system in norway with emphasis on the generation scheduling approach procedures and tools for long medium and short term scheduling are described scheduling is carried out by each individual utility since scheduling is based on profit maximizing the spot market price is a very important factor this price is varying and uncertain however a part of the paper describes how to deal with this by considering the spot market price as an exogenously given stochastic variable it is shown how to extend the common water value computations so as to handle this case implications to the medium and short term scheduling are also discussed

current status and analysis of renewable promotional policies in indian restructured power sector a review restructuring has changed the traditional mission and mandates of power utilities in complex ways and had large impacts on environmental social and political conditions for any particular country at the same time new regulatory approaches are being found for reducing environmental impacts in restructured power sectors india has a vast supply of renewable energy resources and it has one of the largest programs in the world for deploying renewable energy based products and systems so this paper attempts to review the various policies and measures undertaken by indian government for promotion of renewable energy the aim of this paper is also to review the current policy mechanisms especially investment or generation based price driven and capacity driven mechanisms ranging from investment incentives for the development of renewable energy projects feed in tariffs production tax incentives tradable green certificates and their effects upon the prospects of encouraging as well as expanding the development of renewable energy in indian restructured power sector this will make renewable more attractive in the indian future electricity market

benefit optimization of centralized and decentralized power systems in a multi utility environment the objective is to examine the theoretical bases for benefit optimization in centralized and decentralized electric power systems in a centralized single control power system cost revenue and profit are used as system performance criteria for benefit optimization and the conditions are compared the results show that conventional cost minimization is not necessarily equivalent to benefit optimization based on other criteria in a decentralized multi utility power system benefit optimization and its allocation are investigated at the unconstrained economic optimum economic optimum with constraints and conditions under which the solution is an economic suboptimum the data from the epri regional systems are used to show practical examples of the benefit allocation with wheeling transactions although some rules are better for society than others there still is not one right answer to determine the rules for benefit optimization

the yield curve and the macro economy across time and frequencies this paper assesses the relation between the yield curve and the main macroeconomic variables in the u s between early 1960s and 2009 across time and frequencies using wavelet analyses the shape of the yield curve is modelled by latent factors corresponding to its level slope and curvature estimated by maximum likelihood with the kalman filter the macroeconomic variables measure economic activity unemployment inflation and the fed funds rate the cross wavelet tools employed coherency and phase difference the set of variables and the length of the sample allow for a thorough appraisal of the timevariation and structural breaks in the direction intensity synchronization and periodicity of the relation between the yield curve and the macro economy our evidence establishes a number of new stylized facts on the yield curve macro relation and sheds light on several results found in the literature which could not have been achieved with analyses conducted strictly in the time domain as most of the literature or purely in the frequency domain

do oil spot and futures prices move together abstract this paper investigates the time varying correlation and the causal relationship between crude oil spot and futures prices using a newly developed approach wavelet coherency analysis in time frequency domain first we find evidence of a long run cointegration relationship between oil spot and futures prices moreover the short run causality is more significant in shorter maturity pairs versus longer maturity pairs in the vector error correction framework second the results from wavelet coherency analysis show significant dynamic correlations between variables in the time frequency domain third the illustration of the phase difference series around zero suggests that spot and futures prices contribute to the dynamics of the long run equilibrium fourth and finally we provide reasons for the structural changes in oil prices and also recommend investment strategies corresponding to risk diversification future studies focusing on the behavior of oil prices should consider the characteristics of the time frequency space and lead lag dynamic relationships

a physical flow based approach to allocating transmission losses in a transaction framework a physical flow based approach to allocating transmission losses in a multiple transaction system is presented the allocation scheme is developed using a framework in which the transactions are explicitly represented the proposed scheme is based on expressing losses explicitly in terms of all the transactions in the system an important property of the allocation scheme is its effective capability to deal with counter flows that result in the presence of specific transactions extensive numerical testing indicates that the allocation scheme produces loss allocations that are appropriate and that behave in a physically reasonable manner test results on several systems are presented

an algorithm for the allocation of distribution system demand and energy losses this paper describes a new approach to the evaluation of loss adjustment factors for distribution systems such factors are required for use of system and wheeling calculations and reflect the amount by which purchases of energy at entry points to the system must exceed consumption at the point of use to account for the losses which occur in between renewed interest in cost reflective methods of charging for losses has resulted from the deregulation of the electricity supply industry in many parts of the world an algorithm is described which combines the use of graph theory with readily available load flow results to assign the losses in each line or transformer within the system to the consumers supplied by it the resulting allocation is shown to account for the voltage level location and consumption pattern of the consumer in a way which is economically efficient a variety of strategies for apportioning losses between multiple consumers at a given location can be implemented the algorithm is suitable for allocating both demand and energy losses results on a full size distribution network are presented and are compared with traditional published loss adjustment factors

estimating incumbency advantage without bias in this paper we prove theoretically and demonstrate empirically that all existing measures of incumbency advantage in the congressional elections literature are biased or inconsistent we then provide an unbiased estimator based on a very simple linear regression model we apply this new method to congressional elections since 1900 providing the first evidence of a positive incumbency advantage in the first half of the century incumbency advantage is the most frequently studied factor in the last 15 years of congressional elections research discovery of the increase in incum bency advantage has sparked controversy over its origins historical pattern cur rent magnitude and electoral democratic and policy consequences even the most basic descriptive information about incumbency advantage is flawed be cause every previous measure based on aggregate data in this literature is plagued by selection bias inconsistencies and inefficiencies we prove this result and also propose a new unbiased and statistically efficient measure that is very easy to calculate congressional elections from 1900 to the present fit our theoretical model our empirical reanalyses do not challenge the existing scholarly consen sus that incumbency advantage is much larger than it once was however we do challenge the prevailing belief that incumbency advantage was nonexistent and the evidence that it was negative in house elections during the first half of this century alford and brady 1988 we show instead that the average advantage of incumbency in these elections was about two percentage points in section 1 of this paper we define incumbency advantage and section 2 gives an intuitive sense of the problems identifying it even in ideal electoral sys tems section 3 formally proves that sophomore surge and retirement slump are biased estimates of incumbency advantage and section 4 briefly reveals the flaws

interchange costing and wheeling loss evaluation by means of incrementals electricity the authors consider the incremental pricing concepts and incremental loss concepts for use in real time operations involving interchange evaluation and wheeling loss evaluation they provide an overview of methods to evaluate the cost of electrical energy for purchases and sales using incrementals i e derivatives of energy costs and energy losses since incrementals are directly available from economic dispatch the methods are well suited for rapid on line costing the authors extend the incremental methods to calculate on line losses associated with three party or wheeling type transactions the accuracy of the method of calculating wheeling losses is verified by a load flow comparison the potential impacts to the production cost for such transactions are also evaluated using a large system model finally it is pointed out that the overall production cost of the wheeling utility may increase or decrease even though the wheeling losses are completely accounted for due to the change in generation profile which results from adjustments in the economic dispatch

wheeling rates based on marginal cost theory knowledge of what rates for wheeling electric power should be if based on marginal costs is vital in the debate on how wheeling should be priced the authors present extensive computations of marginal costs sensitivities to losses constraints load levels amount of power wheeled revenue reconciliation etc are examined in the context of two case studies revenue reconciliation for capital recovery is described briefly