assessing the short term revenue impacts of residential pv systems on electricity customers retailers and network service providers abstract falling costs and supportive government policies have seen remarkable growth in residential photovoltaic systems in jurisdictions around the world while there have been detailed studies of the financial attractiveness of pv for home owners under different policy and retail market arrangements there has been less consideration of the impacts of such systems on some other key industry participants in this paper we undertake an investigation of the annual short term revenue impacts of pv systems for those households installing them for their electricity retailers and network service providers nsps and for all electricity customers more in general in the australian state of nsw we use actual half hourly pv generation and electricity consumption for 80 households in sydney to estimate the real world impacts of a range of former current and possible future pv policy and retail tariff arrangements including gross and net feed in tariffs fit we found that the short term revenue impacts differ significantly for different commercial arrangements and are highly variable and largely driven by the pv performance and its match with household consumption patterns results highlight that current net metering policies in australia with low net fit rates may provide only moderate revenue incentives to households yet quite adverse revenue impacts on nsps and retailers depending on the level of pv export while nsp short term revenue losses will likely involve increasing electricity tariffs in the longer term losses for retailers may add risks to the profitability of household customers with pv the challenge for policy makers is to facilitate socially valuable pv deployment whilst appropriately managing the impacts on all key electricity industry stakeholders

computing welfare losses from data under imperfect competition with heterogeneous goods abstract we study the percentage of welfare losses pwl yielded by imperfect competition under product differentiation when demand is linear even if prices outputs costs and the number of firms can be observed pwl is arbitrary in both cournot and bertrand equilibria if in addition the elasticity of demand resp cross elasticity of demand is known we can calculate pwl in a cournot resp bertrand equilibrium when demand is isoelastic and there are many firms pwl can be computed from prices outputs costs and the number of firms we find that price marginal cost margins and demand elasticities may influence pwl in a counterintuitive way we also provide conditions under which pwl increases or decreases with concentration

targeting energy justice exploring spatial racial ethnic and socioeconomic disparities in urban residential heating energy efficiency abstract fuel poverty the inability of households to afford adequate energy services such as heating is a major energy justice concern increasing residential energy efficiency is a strategic fuel poverty intervention however the absence of easily accessible household energy data impedes effective targeting of energy efficiency programs this paper uses publicly available data bottom up modeling and small area estimation techniques to predict the mean census block group residential heating energy use intensity eui an energy efficiency proxy in kansas city missouri results mapped using geographic information systems gis and statistical analysis show disparities in the relationship between heating eui and spatial racial ethnic and socioeconomic block group characteristics block groups with lower median incomes a greater percentage of households below poverty a greater percentage of racial ethnic minority headed households and a larger percentage of adults with less than a high school education were on average less energy efficient higher euis results also imply that racial segregation which continues to influence urban housing choices exposes black and hispanic households to increased fuel poverty vulnerability lastly the spatial concentration and demographics of vulnerable block groups suggest proactive area and community based targeting of energy efficiency assistance programs may be more effective than existing self referral approaches

changes in food purchases at retirement in france abstract we estimate the impact of retirement on food expenditure and food quantities purchased using detailed home scan panel data on food purchases and household characteristics in france we identify a causal relationship by exploiting the french legal minimum age for retirement as an exogenous shock to retirement behavior upon retirement households significantly decrease their expenditure on food and the amount of food purchased households with lower pre retirement income appear to be more severely affected our results indicate that the decrease in food quantities purchased at the aggregate level is driven by a decline in purchases of food from animal origins a reduced consumption of animal based food products is likely to undermine the diet balance of retirees

endogenous number of firms horizontal concentration and heterogeneity of firms a note we re examine implications of heterogeneity of firms under a cournot setting on free entry equilibria concerning the number of firms heterogeneity reduces the number of firms in equilibrium the larger the cost asymmetries the smaller the free entry equilibrium number of firms in an industry

efficiency and surplus bounds in cournot competition we derive bounds on the ratios of deadweight loss and consumer surplus to producer surplus under cournot competition to do so we introduce a parameterization of the degree of curvature of market demand using the parallel concepts of concavity and convexity the more concave is demand the larger the share of producer surplus in overall surplus the smaller is consumer surplus relative to producer surplus and the lower the ratio of deadweight loss to producer surplus deadweight loss over total potential surplus is at rst increasing with demand concavity then eventually

the retirement consumption puzzle a marital bargaining approach abstract evidence from several countries reveals a substantial drop in household consumption around the age of retirement that is difficult to explain with life cycle models using food consumption data from more than 550 households from the panel study of income dynamics for the years 1979 1986 and 1989 1992 we find that married couple households decrease their expenditures on both food consumed at home and away from home by about 9 following the retirement of the male household head no significant decrease in consumption is found for single households either in a sample of males or a pooled sample of single males and females these results are consistent with a model of marital bargaining in which wives prefer to save more than their husbands do to support an expected longer retirement period and relative control over household decisions is affected by control over market income the pattern of the consumption decline which is increasing in the age gap between husband and wife lends further support to this interpretation

cournot equilibrium in large markets under increasing returns abstract we consider cournot partial equilibria in large markets where firms have decreasing average costs it is shown that the outcome of competition is approximatelyefficient if entry is free

consumption during retirement the missing link in the life cycle this study presents the first evidence on the relation of consumption to lifetime wealth based on data from the 1973 and 1975 retirement history survey that have been linked to social security earnings records nearly 500 white married fully retired couples ages 62 69 form the basis of the analysis on average their consumption early in retirement exceeds by 14 percent the income that their financial pension and social security wealth can generate this implies that their saving both private and through social security is insufficient to sustain consumption throughout the rest of their lives additional evidence based on changes in spending between 1973 and 1975 shows that these households respond by reducing their real consumption at a rate sufficient to generate positive changes in net financial worth within a few years after retirement these two pieces of evidence can be rationalized by a rate of time preference much higher than the interest rate coupled with either a bequest motive or uncertainty about the length of life they also imply that even when combined with private pensions and savings social security in the united states today does not enable most recipients to maintain their living standard at the levels they enjoyed before they retired this abstract was borrowed from another version of this item

optimal policy and network effects for the deployment of zero emission vehicles abstract we analyze the impact of indirect network effects in the deployment of zero emission vehicles in a static partial equilibrium model in most theoretical analyses direct and indirect effects are conflated and relatively few authors have explicitly considered indirect network effects we also introduce the market power of vehicle producers and scale effects in the production function the model exhibits a multiplicity of local social critical points and market equilibria suggesting a possibility of lock in the optimal two subsidies for vehicles and stations are derived so that the pareto dominating market equilibrium would coincide with the social optimum configurations associated with different values of the parameters are explored to revisit the policy issues at various stages of deployment of hydrogen and battery electric vehicles

welfare changes in the cournot setting with an empirical application to the telecommunications industry i characterize the efficiency of the cournot equilibrium and provide bounds for the loss in consumer surplus producer surplus and welfare when the number of firms in the market changes i only assume that demand is decreasing in price and costs increasing in the quantity produced as long as equilibrium exists i show how price demand and average cost before and after the number of firms in the market changes can be used to compute these bounds i apply these bounds to the portuguese wireline market and conclude that welfare increased significantly when the monopolist was split in 2007

consumption needs and inequality most empirical studies demonstrating a u turn in inequality in the united states are based on the distribution of income however utility is derived from the consumption of goods and services and there are many reasons to expect the distribution of expenditure to be different from the distribution of income the author demonstrates that consumption based inequality indexes actually decrease over the postwar era this conclusion differs from the stylized facts because of differences in the income and expenditure distributions differences also arise from the inclusion of equivalence scales to account for the different needs of heterogeneous households copyright 1994 by economics department of the university of pennsylvania and the osaka university institute of social and economic research association

free entry and social inefficiency our goal is to provide a simple yet general exposition of the conditions under which the number of entrants in a free entry equilibrium is excessive insufficient or optimal our analysis compares the number of firms that enter a market when there is free entry with the number that would be desired by a social planner who is unable to control the behavior of firms once they are in the market that is we consider the second best problem of choosing the welfare maximizing number of firms while we take as given their noncompetitive behavior after entry we demonstrate that the crucial conditions for establishing the presence of an entry bias can be stated quite simply in terms of the outcome of the postentry game played by entrants in contrast to previous work we do not need to model this postentry game explicitly

did we lose the war on poverty was the war on poverty a failure or a success official u s poverty statistics based on household income imply that the war on poverty ended in failure according to the bureau of the census the proportion of the u s population below the poverty level of income reached a minimum of 11 1 percent in 1973 this ratio rebounded to 15 2 percent in 1983 and has fluctuated within a narrow range since then giving rise to the widespread impression that the elimination of poverty is difficult or even impossible 1 however poverty estimates based on household consumption imply that the war on poverty was a success jorgenson and slesnick 1989 showed that the proportion of the u s population below the poverty level of consumption fell to 10 9 percent in 1973 only slightly below the poverty incidence as measured by income in that year the poverty ratio for consumption declined further reaching 6 8 percent in 1983 slesnick 1993 presents estimates of poverty ratios incorporating consumption data from the consumer expenditure survey conducted by the bureau of labor statistics the poverty rate for consumption fell to 9 7 percent in 1973 and reached a low of 8 7 percent in 1978 before rising to 12 0 percent in 1980 the consumptionbased poverty rate then declined to a new low of 8 3 percent in 1986 ending at 8 4 percent in 1989 calibrating consumption to levels reported in the u s national income and product accounts slesnick obtained a poverty rate of 4 1 percent in 1978 and a postwar low in 1989 of only 2 2 percent 2 1 the persistence of poverty as reflected in the official statistics is discussed by sawhill 1988 2 slesnick 1993 presented a detailed decomposition of the differences between estimates of poverty rates based on consumption and the official estimates based on income neither measures of consumption from the consumer expenditure survey nor measures of income used by the bureau of the census include in kind transfers slesnick 1996 discussed the effects of these transfers on measures of poverty

welfare losses under cournot competition abstract in a market for a homogeneous good where firms are identical compete in quantities and produce with constant returns the percentage of welfare losses pwl is small with as few as five competitors for a class of demand functions which includes linear and isoelastic cases we study markets with positive fixed costs and asymmetric firms we provide exact formulae of pwl and robust constructions of markets were pwl is close to one in these two cases we show that the market structure that maximizes pwl is either monopoly or dominant firm depending on demand finally we prove that pwl is minimized when all firms are identical a clear indication that the assumption of identical firms biases the estimation of pwl downwards

effects of changes in italian bioenergy promotion schemes for agricultural biogas projects insights from a regional optimization model italy has witnessed an extraordinary growth in biogas generation from livestock effluents and agricultural activities in the last few years as well as a severe isomorphic process leading to a market dominance of 999 kw power plants owned by entrepreneurial farms under the pressure of the economic crisis in the country the italian government has restructured renewable energy support schemes introducing a new program in 2013 in this paper the effects of the previous and current support schemes on the optimal plant size feedstock mix and profitability were investigated by introducing a spatially explicit biogas supply chain optimization model which accounts for different incentive structures by applying the model to a regional case study homogenization observed to date is recognized as a result of former incentive structures considerable reductions in local economic potentials for agricultural biogas power plants without external heat use are estimated new plants are likely to be manure based and due to the lower energy density of such feedstock wider supply chains are expected although optimal plant size will be smaller the new support scheme will therefore most likely eliminate past distortions but also slow down investments in agricultural biogas plants

rising inequality changes in the distribution of income and consumption in the 1980s this paper examines changes in the distribution of income and consumption in the united states during the 1980s using data from the current population survey income and consumer expenditure survey consumption we reach three primary conclusions first changes in the distribution of consumption parallel changes in the distribution of income the lowest quintile of the consumption distribution received 0 9 percentage points less of total consumption in 1988 than in 1980 the corresponding decline for income was 0 6 percentage points second broad conclusions concerning recent changes in the consumption distribution are not very sensitive to the exact choice of a measure of family needs under a wide variety of alternative household equivalence scales there is a widening in the consumption distribution in the 1980s third the usc of consumption measures of well being in place of measures based on current money income docs change conclusions concerning the extent of poverty in the united stales using the official federal poverty thresholds we find that the overall consumption poverty rate was three percentage points below the income poverty rate in 1988 comparisons of the poverty rates of the elderly and the non elderly are substantially affected by the choice of poverty measure the consumption poverty rare for the elderly was only 60 percent of the rate for adults and one third of the rate for children in 1988 this abstract was borrowed from another version of this item

prospects for expanded utilization of biogas in germany the prospects for expanded utilization of biogas systems in german was analysed by identifying the operational and policy factors affecting the complete chain of processes from implementation process for biogas plants through to biogas production and utilization it was found that the renewable energies act eeg and energy tax reliefs provide bases for the support of expanded utilization upgrading of biogas to natural gas quality for utilization in the transportation sector was arguably the most promising technology that could support rapid utilization expansion sustainable deployment of biogas systems in light of the unstable feedstock prices and availability and the need for subsidy free operation in the long term requires enhancement of feedstock flexibility and quality characteristics to maximise gas yield and optimisation of the anaerobic digestion process management assessment of energy balance and potential environmental impacts of the integrated process chain provides a holistic assessment of sustainability the results also support the development and foster of policies and framework for development of biogas as environmentally friendly energy resource among a mix of renewable energy sources hence compete favourably with fossil fuels to enhance the prospects for expanded utilization

unequal resilience the duration of electricity outages abstract the resilience of social biophysical and technological systems is of increasing scholarly and practical import guided by scholarship on disaster resilience environmental inequality and urban service inequality we advance the study of unequal resilience in a critical infrastructure the electric grid we analyze inequality in electricity outage duration at the census block group level using data from the u s census the u s geological survey and a u s electrical utility s database of power outages from 2002 to 2004 our intersectional approach identifies a factor variable of american indian disadvantage as a correlate of average outage duration suggesting possible support for an institutional bias hypothesis however spatial error regression models demonstrate that unequal resilience within our study area is most consistently explained by proximity to priority assets i e hospitals average downstream customers affected by outages and environmental conditions i e the seasonality of outages these results are consistent with existing research on utilities response to power outages and more broadly with the bureaucratic decision rules perspective on service inequalities we discuss the implications of our findings for future research and energy policy

oligopoly and welfare welfare losses due to monopoly have received much attention in the literature since the pioneering work of harberger 1954 over the past decade the discussion has inter alia been extended to take explicit account of oligopolistic interaction see in particular dixit and stern 1982 masson and shaanan 1984 daskin 1991 however the ultimate aim has mostly remained to work towards theoretically well grounded empirical estimates of actual losses in different industries sectors or economies as daskin observes the range of estimated losses though significantly larger than harberger s original 0 1 per cent of gnp with one or two notable exceptions rarely exceeds 1 3 per cent of the value of output based on monopoly models1 though using a theoretical extension and empirical implementation of dixit and stern daskin himself goes on to report an estimate of 6 10 per cent of the value of shipments for the us manufacturing sector if industry demand is elastic and considerably higher with inelastic demand

changes in consumption at retirement evidence from panel data abstract previous empirical literature has found a sharp decline in consumption during the first years of retirement implying that individuals do not save enough for their retirement this phenomenon is called the retirement consumption puzzle we find no evidence of the retirement consumption puzzle using panel data from 1980 to 2000 consumption is defined as nondurable expenditure a more comprehensive measure than only food used in many of the previous studies we find that food expenditure declines at retirement which is consistent with previous studies

the retirement consumption conundrum evidence from a consumption survey abstract recent studies have shown that food consumption declines at retirement we use broader definitions of consumption from the consumer expenditure survey and find that the so called retirement consumption puzzle is solved by using comprehensive consumption data

the retirement consumption puzzle in china abstract using data from china s urban household survey and exploiting china s mandatory retirement policy we use the regression discontinuity approach to estimate the impact of retirement on household expenditures retirement reduces total non durable expenditures by 20 percent among the categories of non durable expenditures retirement reduces work related expenditures and expenditures on food consumed at home but has an insignificant effect on entertainment expenditures after excluding these three components retirement does not have an effect on the remaining non durable expenditures it suggests that the retirement consumption puzzle might not be a puzzle if a life cycle model with home production is considered

the retirement consumption puzzle evidence from a regression discontinuity approach in this paper we investigate the size of the consumption drop at retirement in italy we use micro data on food and total non durable household spending covering the period 1993 2004 and evaluate the change in consumption that accompanies retirement by exploiting the exogenous variability in pension eligibility to correct for the endogenous nature of the retirement decision we take a regression discontinuity design approach and make the identifying assumption that consumption would be the same around the threshold for pension eligibility if individuals would not retire we check in our data that a non negligible fraction of individuals retire as soon as they become eligible and estimate at 9 8 the part of the non durable consumption drop that is associated with retirement induced by eligibility we show that such fall is not driven by liquidity problems for the less well off in the population and can be accounted for by drops in goods that are work related expenses or leisure substitutes however we also show that retirement induces a significant drop in the number of grown children living with their parents and this can account for most of the retirement consumption drop

resolving society s energy trilemma through the energy justice metric carbon dioxide emissions continue to increase to the detriment of society in many forms one of the difficulties faced is the imbalance between the competing aims of economics politics and the environment which form the trilemma of energy policy this article advances that this energy trilemma can be resolved through energy justice energy justice develops the debate on energy policy to one that highlights cosmopolitanism progresses thinking beyond economics and incorporates a new futuristic perspective to capture these dynamics of energy justice this research developed an energy justice metric ejm that involves the calculation of several metrics 1 a country national ejm 2 an ejm for different energy infrastructure and 3 an ejm which is incorporated into economic models that derive costs for energy infrastructure projects an ejm is modeled for china the european union and the united states and for different energy infrastructure in the united kingdom the ejm is plotted on a ternary phase diagram which is used in the sciences for analyzing the relationship trilemma of three forms of matter the development of an ejm can provide a tool for decision making on energy policy and one that solves the energy trilemma with a just and equitable approach

entry barriers and economic welfare the relationship between economic welfare and the number of firms in a quasi cournot market is examined in the first place we presuppose the existence of a strong first best government that can enforce the marginal cost principle to the firms along with regulating the number of firms it is shown that there exist excessive number of firms at the free entry quasicournot equilibrium vis a vis the first best welfare maximizing number of firms the thrust of this result essentially survives even if we replace a utopian first best government by a secondbest government that leaves the firms to pursue their respective profit maximization freely and engages solely in regulating the number of firms it can be shown that the excess entry prevails again in this second best world recent studies in the theoretical industrial organization literature have uncovered several instances which cast serious doubt on the reasonableness of a widespread belief that increasing competition will increase welfare stiglitz 1981 p 184 it has been shown that there are cases which are not altogether unreasonable where social welfare will be increased by strengthening rather than weakening the protection of incumbent firms from the threat of potential entry this is in sharp contrast with the traditional belief 2 what is not known however is how robust these pathologies in fact are we intend to settle this problem by proving two excess entry theorems in the quasi cournot parametric conjectural variations homogeneous oligopoly model seade 1980a b in the first place we presuppose the existence of a strong first best government that could costlessly enforce the marginal cost pricing principle by firms in an oligopolistic market and regulate entry in pursuit of first best social welfare optimization it is shown that the number of firms at the free entry equilibrium exceeds the first best welfare optimizing number of firms the result has already been noted by von weizsacker 1980a b and others in terms of numerical examples our theorem 1 asserts that this phenomenon always holds true for the family of quasi cournot models at hand an implication of this result is that the existence of entry barriers which protect incumbent firms from potential competitors is not necessarily welfare decreasing in sharp contrast with the traditional belief a problem remains with theorem 1 however in that an omnipotent first best government does not exist in reality and the first best ideal is unrealizable in the actual economy therefore even if the intervention by a first best government with a view to restricting the number of firms within an industry may be welfare improving it does

on the rate of convergence of oligopoly equilibria in large markets an example abstract in this note we explore the rate of convergence of cournot nash equilibria with free entry and those with an entry deterring monopolist in a replicated market where the market demand functions is linear and firms face linear cost curves

competition timing of entry and welfare in a preemption game we show that in a preemption game of entry into a cournot market increasing the number of competitors beyond duopoly does not bring forward the time of first entry we also show that all entries except the first one occur earlier than socially optimal

what accounts for the variation in retirement wealth among u s households even among households with similar socioeconomic characteristics saving and wealth vary considerably life cycle models attribute this variation to differences in time preference rates risk tolerance exposure to uncertainty relative tastes for work and leisure at advanced ages and income replacement rates these factors have testable implications concerning the relation between accumulated wealth and the shape of the consumption profile using the panel study of income dynamics and the consumer expenditure survey we find little support for these implications the data are instead consistent with rule of thumb mental accounting or hyperbolic discounting theories of wealth accumulation jel di d91 e21

modeling of biomass to energy supply chain operations applications challenges and research directions reducing dependency on fossil fuels and mitigating their environmental impacts are among the most promising aspects of utilizing renewable energy sources the availability of various biomass resources has made it an appealing source of renewable energy given the variability of supply and sources of biomass supply chains play an important role in the efficient provisioning of biomass resources for energy production this paper provides a comprehensive review and classification of the excising literature in modeling of biomass supply chain operations while linking them to the wider strategic challenges and issues with the design planning and management of biomass supply chains on that basis we will present an analysis of the existing gaps and the potential future directions for research in modeling of biomass supply chain operations

key challenges to expanding renewable energy the key advantage of renewables is that they are free of direct pollution and carbon emissions given concern over global warming caused by carbon emissions there are substantial policy efforts to increase renewable penetrations the purpose of this paper is to outline and evaluate the challenges presented by increasing penetrations of renewable electricity generation these generation sources primarily include solar and wind which are growing rapidly and are new enough to the grid that the impact of high penetrations is not fully understood the intrinsic nature of solar and wind power is very likely to present greater system challenges than conventional sources within limits those challenges can be overcome but at a cost later sections of the paper will draw on a variety of sources to identify a range of such costs at least as they are foreseen by researchers helping prepare ambitious plans for grids to obtain high shares 30 50 of their megawatt hours from primarily solar and wind generation energy poverty issues are outlined and related to renewable costs issues

solar power generation in the us too expensive or a bargain abstract this article identifies the combined value that solar electric power plants deliver to utilities rate payers and society s tax payers benefits that are relevant to utilities and their rate payers include traditional measures of energy and capacity benefits that are tangible to tax payers include environmental fuel price mitigation outage risk protection and long term economic growth components results for the state of new york suggest that solar electric installations deliver between 15 and 40 kwh to ratepayers and tax payers these results provide economic justification for the existence of payment structures often referred to as incentives that transfer value from those who benefit from solar electric generation to those who invest in solar electric generation

non separable time preferences novelty consumption and body weight theory and evidence from the east german transition to capitalism abstract this paper develops a dynamic model to illustrate how diet and body weight change when novel food products become available to consumers we propose a microfounded test to empirically discriminate between habit and taste formation in intertemporal preferences moreover we show that novelty consumption and endogenous preferences can explain the persistent correlation between economic development and obesity by empirically studying the german reunification we find that east germans consumed more novel western food and gained more weight than west germans when a larger variety of food products became readily accessible after the fall of the wall the observed consumption patterns suggest that food consumption features habit formation

energy production from biogas in the italian countryside policies and organizational models abstract in recent years italy has witnessed a proliferation of agricultural biogas plants this article argues that institutional factors have played an important role in their diffusion it describes the state and evolution of agricultural biogas in italy and then investigates the extent to which institutional pressures have been influential in shaping organizational models of biogas production it finds that the dominance of one particular organizational model is the result of an isomorphic process in which a monopolistic market legal structures and subsidies play a role the prevalence of this organizational model however does not lead to the effective use of biogas production and furthermore it results in low environmental efficiency for a more sustainable development of bioenergy italian policy makers should reform the existing institutional framework by reorganizing subsidies liberalizing the management of gas grids and involving farmers in local projects

cournot equilibrium with free entry the case of decreasing average cost functions this paper investigates in the context of a market for a homogeneous commodity the asymptotic properties of cournot equilibria with free entry when the size of the market increases indefinitely the analysis focuses on the case where the average cost function is always decreasing and the marginal cost function is non decreasing for all sufficiently large outputs

food expenditure and involuntary retirement resolving the retirement consumption puzzle international research has shown that household expenditure on nondurables significantly decreases at retirement a finding that is inconsistent with the standard life cycle model of consumption if retirement is anticipated we analyze australian panel data and find that the decline in grocery and food expenditure is explained by households forced to retire earlier than planned due to a health event or job loss which represent unanticipated wealth shocks for most households retirement is anticipated and there is no decline in basic expenditures however for an important minority retirement is involuntary and these households experience a marked decline across the basic expenditure categories

helping minor firms reduces welfare the effect on national welfare of uneven technical progress and eli mination of a firm is analyzed under the existence of a cournot oligopolistic sector an increase in the share of an inefficient firm owing to its innovations results in a shift of production from more efficient firms to the inefficient firm causing a less efficie nt allocation of production it may decrease welfare even though the innovation itself is beneficial conversely policies keeping ineffic ient firms from innovations or eliminating them may increase welfare though they make the market structure more oligopolistic copyright 1988 by royal economic society

fuel poverty as injustice integrating distribution recognition and procedure in the struggle for affordable warmth bringing attention to fuel poverty as a distinct manifestation of social inequality has asserted the place of affordable warmth in the profile of contemporary rights and entitlements as such fuel poverty can be understood as an expression of injustice involving the compromised ability to access energy services and thereby to secure a healthful living environment in this paper we consider how fuel poverty may be aligned to various alternative concepts of social and environmental justice whilst recognising that fuel poverty is fundamentally a complex problem of distributive injustice we argue that other understandings of injustice are also implicated and play important roles in producing and sustaining inequalities in access to affordable warmth addressing fuel poverty has to involve seeking justice in terms of the cultural and political recognition of vulnerable and marginalised social groups and pursuing procedural justice through opening up involvement and influence in decision making processes we make this argument both in theoretical terms and through considering the experience of fuel poverty advocacy and policy development in the uk opportunities for future action may be illuminated through such interconnected justice framings as wider awareness of energy climate and poverty issues emerge

welfare losses in oligopoly and monopolistic competition estimates of the magnitudes of monopoly welfare losses mwl appearing in the economics literature have tended to differ quite widely at one end of the spectrum we find figures of the order of o i of gnp quoted by harberger i 954 in his pioneering study while at the other extreme cowling and mueller i 978 have derived estimates of around i o of gross corporate product from some of their measures two of the major sources of such differences lie in the treatment of a the general equilibrium aspects of deviations between prices and marginal costs and b the impact of market power on the cost levels of firms but unfortunately the tendency of writers to adopt rather different analytical frameworks often makes it difficult to accurately assign the variations in the estimates to specific factors in the present paper the issue of monopoly welfare loss is considered in the context of a differentiated goods model based upon work on monopolistic competition by spence i976 and by dixit and stiglitz i977 within a set of common assumptions about demand the effects of varying cost conditions and differing equilibria on the level of mwl are examined on this basis four major factors connected with suboptimal resource allocation can be identified a supernormal profits b product differentiation c suboptimal scale and d factor bias the first of these needs little explanation its association with welfare loss has been well explored in structure conduct performance theory and is used extensively in applied anti trust economics attention will therefore be focused upon the remaining three all of which can produce mwl in zeroprofit equilibria the paper is organised as follows section ii sets out and discusses the differentiated goods framework which will be used throughout the rest of the analysis it is also shown how a simple transformation of variables reduces the model to the homogeneous goods case and thereby makes immediately available a number of familiar results from the structure conduct performance literature in section iii the focus is on welfare analysis of monopolistic competition the results here are essentially restatements of earlier work although the transformation of variables helps to clarify their foundations section iv extends the analysis to incorporate additional decision variables such as advertising research and development etc while section v considers the case where market conditions will not sustain a large number of firms in equilibrium and suboptimal scale effects become important factor bias is analysed in

regulating a monopolist with unknown costs we consider the problem of how to regulate a monopolistic firm whose costs are unknown to the regulator the regulator s objective is to maximize a linear social welfare function of the consumers surplus and the firm s profit in the optimal regulatory policy prices and subsidies are designed as functions of the firm s cost report so that expected social welfare is maximized subject to the constraints that the firm has nonnegative profit and has no incentive to misrepresent its costs we explicitly derive the optimal policy and analyze its properties in their classic papers dupuit 2 and hotelling 5 considered pricing policies for a bridge that had a fixed cost of construction and zero marginal cost they demonstrated that the pricing policy that maximizes consumer well being is to set price equal to marginal cost and to provide a subsidy to the supplier equal to the fixed cost so that a firm would be willing to provide the bridge this first best solution is based on a number of informational assumptions first the demand function is assumed to be known to both the regulator and to the firm while the assumption of complete information may be too strong the assumption that information about demand is as available to the regulator as it is to the firm does not seem unnatural a second informational assumption is that the regulator has complete information about the cost of the firm or at least has the same information about cost as does the firm this assumption is unlikely to be met in reality since the firm would be expected to have better information about costs than would the regulator as weitzman has stated an essential feature of the regulatory environment i am trying to describe is uncertainty about the exact specification of each firm s cost function in most cases even the managers and engineers most closely associated with production will be unable to precisely specify beforehand the cheapest way to generate various hypothetical output levels because they are yet removed from the production process the regulators are likely to be vaguer still about a firm s cost function 12 p 684 as this observation suggests it is natural to expect that a firm would have better information regarding its costs than would a regulator the purpose of this paper is to develop an optimal regulatory policy for the case in which the regulator does not know the costs of the firm one strategy that a regulator could use in the absence of full information about costs is to give the firm the title to the total social surplus and to delegate the pricing decision to the firm in pursuing its own interests which would then be to maximize the total social surplus the firm would adopt the same marginal cost pricing strategy that the regulator would have imposed if the regulator had

is there a retirement consumption puzzle evidence using subjective retirement expectations abstract previous research finds a systematic decrease in consumption at retirement a finding that is inconsistent with the life cycle permanent income hypothesis if retirement is an expected event in this paper we use workers subjective beliefs about their retirement dates as an instrument for retirement after demonstrating that subjective retirement expectations are strong predictors of subsequent retirement decisions we still find a consumption decline at retirement for workers who retire when expected however our estimates of this consumption fall are about a third less than those found when we instead rely on the instrumental variables strategy used in prior studies

consumption versus expenditure previous authors have documented a dramatic decline in food expenditures at the time of retirement we show that this is matched by an equally dramatic rise in time spent shopping for and preparing meals using a novel data set that collects detailed food diaries for a large cross section of u s households we show that neither the quality nor the quantity of food intake deteriorates with retirement status we also show that unemployed households experience a decline in food expenditure and food consumption commensurate with the impact of job displacement on permanent income these results highlight how direct measures of consumption distinguish between anticipated and unanticipated shocks to income whereas measures of expenditures obscure the distinction

is there a retirement savings puzzle in this paper we ask whether households are saving enough for their retirement we use data on income expenditure and expenditure components to analyse patterns of behaviour at and around the time of retirement for successive date of birth cohorts we compare periods of unemployment to periods of retirement and separate expenditures into categories reflecting work related expenditures basic necessities and other goods we find that income typically falls by more at unemployment than retirement but the reverse is true for expenditure we observe falls in expenditure at retirement for all expenditure categories using a stochastic life cycle model including mortality rates we assess the anticipated impact of retirement on consumption against that of unemployment the inter relationship between goods and leisure explains a large part of the persistent fall in expenditure at retirement we argue that the only way in which the life cycle hypothesis could be reconciled with the remaining unanticipated dip in consumption would be with the systematic arrival of unexpected adverse information at the time of retirement