modelling seasonality in residential water demand the case of tunisia this article proposes to model seasonal patterns of residential water demand using the techniques of seasonal integration and cointegration the methodology is applied to quarterly aggregate time series data for tunisia 1980 2007 applying the same increasing multi step pricing scheme in the whole country first a seasonal cointegration analysis demonstrates the relevance of a pricing policy that increases the size of the lower consumption block in summer second the nonseasonal cointegration analysis reveals a relatively high price elasticity for the highest consumption block therefore we also propose to increase the tariff progressivity to promote water savings this modified pricing scheme will help to achieve goals of environmental protection and social equity

estimating residential water demand under multi part tariffs using aggregate data using a new model formulation and data from a sample of colorado utilities we investigated the price specification controversy marginal price versus average revenue when estimating residential water demand the improved statistical fit using average

long run water demand estimation habits adjustment dynamics and structural breaks this article examines a water demand equation for milan for the second half of the 20th century 1950 2001 we focus mainly on the effects of price and habits but also account for other factors in the demand for water such as climate income and productive activity allowing for trend break stationarity or nonlinear trend stationarity we find evidence against the unit root hypothesis for many time series based on this result standard cointegration analysis would not be appropriate therefore we adopt an alternative estimation and testing procedure we focus in particular on the so called bounds testing approach which can be applied irrespective of the level of integration of the variables and which can be a useful modelling strategy given that dynamics are important when estimating a water demand equation the main results are that long run price elasticity is higher than short run elasticity and that consumption habits are relevant we also find that both climate sectoral and technological modif

water and energy price impacts on residential water demand in copenhagen while water price effects on residential water demand have been studied for several decades the impact of energy prices does not seem to have received much attention in this paper a residential water demand function derived from a model of household production of final consumption goods taking water energy and an aggregate of other goods as inputs is estimated on pooled time series data we find negative energy cross price elasticities around 0 2 and water price elasticities in the order of 0 1 or smaller

how much does water consumption drop when each household takes charge of its own consumption the case of the city of seville making individuals take charge of their own domestic water consumption is one of the measures used to reduce the growing demand for this resource and to achieve sustainable consumption compatible with the goal of equity the use of individual meters instead of communal meters and fixing tariffs by inhabitant rather than by household are two measures aimed at achieving these objectives this article assesses the measures put in place in the seville metropolitan area during the last 20 years with an unobserved component model set up in a state space framework estimated using maximum likelihood water consumption elasticity to individual meters has changed from 0 307 to 1 317 with the introduction of per inhabitant tariffs which demonstrates that there are water saving synergies when the two measures are implemented together the reductions in water consumption achieved with these measures are also longer lasting than the changes in consumption habits during the frequent droughts in seville

behavioural attitudes towards water saving evidence from a study of environmental actions given the growing emphasis being placed on water conservation in and around the home by water companies there is a pressing need to identify the characteristics of the water saver so that policy makers can more accurately target initiatives for water conservation this paper examines the social attitudinal and behavioural composition of water saving activities using a sample of 1600 households from devon the research sought to examine the links between water saving energy conservation green consumerism and waste management in and around the home accordingly the extent to which water saving can be placed within a behavioural context that incorporates different environmental behaviours is discussed the data relating to water saving are then analysed and four different types of individual are defined according to their behavioural characteristics these are examined in the context of their demographic composition and a range of attitudinal factors the policy implications of the research are described throughout the paper

perceived price in residential water demand evidence from a natural experiment abstract under complicated billing structures the price to which consumers respond remains inconclusive in this paper i exploit a quasi experiment to estimate a causal effect of price for residential water customers during the introduction of increasing block rates for a north carolina utility perceived price is identified through a billing anomaly in which changes in marginal and average prices move in opposite directions empirical results contribute evidence that residential water customers respond to average price average price elasticity estimates vary from 0 43 to 1 14 across the distribution of consumption in triple difference models with an estimate of 0 31 in the tightest bandwidth of regression discontinuity specifications

examining the global environmental impact of regional consumption activities part 2 review of input output models for the assessment of environmental impacts embodied in trade this paper offers a detailed review of recently described single and multi region input output models used to assess environmental impacts of internationally traded goods and services it is the second part of a two part contribution in part 1 turner k lenzen m wiedmann t and barrett j in press examining the global environmental impact of regional consumption activities part 1 a technical note on combining input output and ecological footprint analysis ecological economics we describe how to enumerate the resource and pollution content of inter regional and inter national trade flows with the aim to illustrate an ideal accounting and modelling framework for the estimation of ecological footprints a large number of such environment economic models have been described but only in the last few years models have emerged that use a more sophisticated multi region multi sector input output framework this has been made possible through improvements in data availability and quality as well as computability we identify six major models that employ multi sector multi region input output analysis in order to calculate environmental impacts embodied in international trade results from the reviewed studies demonstrate that it is important to explicitly consider the production recipe land and energy use as well as emissions in a multi region multi sector and multi directional trade model with global coverage and detailed sector disaggregation only then reliable figures for indicators of impacts embodied in trade such as the ecological footprint can be derived

privately operated water utilities municipal price negotiation and estimation of residential water demand the case of france this paper addresses the issue of price negotiation between a municipality and a private water utility operator and its implications for residential water demand estimation we use appropriate econometric procedures to estimate a water demand equation on a panel of french municipalities we find evidence that negotiated water price depends on municipality s characteristics causing endogeneity of price in the demand equation the impact of average household income housing and system features such as metering is investigated both on municipal consumption and price estimated price and income elasticities are significant and close to previous household level studies

on the specification of price in studies of consumer demand under block price scheduling using a new model formulation and data from a sample of colorado utilities we investigated the price specification controversy marginal price versus average revenue when estimating residential water demand the improved statistical fit using average

responses to changes in domestic water tariff structures a latent class analysis on household level data from granada spain a problem that affects the estimation of water demand functions is the presence of unobserved individual heterogeneity which means that a common demand function is unlikely to represent the behavior of all users we implement latent class models to estimate water demand functions for four groups of users who are classified according to their unobservable preferences this more flexible approach makes it possible to distinguish four different response patterns to changes in the drivers of water use including different price elasticities these results should be of particular interest to regulators who would like to tailor water demand management policy to heterogeneous users our analysis exploits household level panel data on residential water demand and consumers characteristics obtained by combining information from a survey of 1 465 domestic users in the city of granada and bimonthly price and consumption data supplied by this city s water supplier from the period 2009 2011

do droughts have long term effects on water consumption evidence from the urban area of barcelona this article examines the long term effects of droughts on water consumption using data of municipalities of the urban area of barcelona two important characteristics of the sample of municipalities are the relatively low water consumption in the pre drought period and the fact that indoor uses are clearly predominant controlling for prices income and various socio demographic factors we find a reduction in water consumption not only during the drought episode but also in subsequent periods these permanent reductions in water use may be explained by household behavioural changes technological changes or structural water policy changes

demand side management policies for residential water use who bears the conservation burden to assess the potential for urban demand side management dsm policies as a water resource management tool we analyze the extent to which price and alternative policy instruments such as use and quantity restrictions and subsidies for water efficient technologies reduce residential demand and their distributional implications by type of household using detailed household level panel data for two california communities the results suggest that the ultimate effects of dsm policies in terms of the reduction in aggregate demand and distribution of water savings among household classes depend both on the policy instrument selected and the composition of aggregate demand

between estimates of the emissions income elasticity abstract recent papers by wagner and vollebergh et al point out some fundamental econometric problems with traditional methods of estimating the environmental kuznets curve ekc and propose alternative approaches that avoid these issues wagner notes that traditional methods do not take into account the presence of powers of unit root variables and cross sectional dependence in the data while vollebergh et al point out that the time effects are not uniquely identified in the ekc model the between estimator is a simple estimator that also addresses the concerns of these authors it makes no a priori assumption about the nature of the time effects and is likely to provide consistent estimates of long run relationships in real world data situations i apply several common panel data estimators including the between estimator to oecd and global carbon and sulfur emissions datasets the between estimates of the sulfur income elasticity are 0 732 in the oecd and 1 067 in the global data set and the estimated carbon income elasticity is 1 612 in the oecd and 1 509 globally

climate change and trade in agriculture agricultural productivity in both developing and developed countries will have to improve to achieve substantial increases in food production by 2050 while land and water resources become less abundant and the effects of climate change introduce much uncertainty already less resilient production areas will suffer the most as temperatures will rise further in tropical and semi tropical latitudes and water scarce regions will face even drier conditions international trade plays an important role in compensating albeit partially for regional changes in productivity that are induced by climate change while a well functioning international trade system can support the adaptation to climate change related challenges trade policies as such are imperfect instruments to induce less emissions globally a well functioning international trading system can support the adaptation to climate change related challenges hence welfare gains from reforms to trade policies may be greater than normally measured if they also reduce ghg emissions globally

cross country evidence for social dimensions of urban water consumption during droughts a systematic literature review is carried out to understand the social dimensions driving the adoption of water saving behaviors in urban households salient aspects of the problem correspond to price elasticity of water demand citizens awareness of water value and water conservation intentions the management of which is generally tackled through water price and non price approaches however the evidence falls short to explain the social drivers and inhibitors of stable water consumption reductions after reviewing 65 papers documenting research conducted in north america australia united kingdom middle east mexico china and japan a series of categories of analysis drawn from the literature are introduced as the social factors that influence water conservation reduction although the brink of the state of the art mentions the existence of an intention behavior gap sustainability requires further aspirations than short term water consumption reduction by households the long term challenges of sustainability require the understanding of intention behavior stable reduction gaps further research is needed to fill this double gap understanding the determinants and insights behind the dissipation or stabilization of water consumption reductions through time are certainly rich areas of analysis for the social sciences

from production based to consumption based national emission inventories abstract under the united national framework convention of climate change unfccc countries are required to submit national emission inventories nei to benchmark reductions in greenhouse gas ghg emissions depending on the definition and system boundary of the nei the mitigation options and priorities may vary the territorial system boundary used by the unfccc has been critiqued for not including international transportation and potentially causing carbon leakage to address these issues past literature has argued in favour of using consumption based nei in climate policy this article discusses several issues in moving from the standard production based nei to consumption based nei first two distinct accounting approaches for constructing consumption based nei are presented the approaches differ in the allocation of intermediate consumption of imported products second a consistent method of weighting production based and consumption based nei is discussed this is an extension of the previous literature on shared responsibility to nei third due to increased uncertainty and a wide system boundary it may be difficult to implement consumption based nei directly into climate policy several alternative options for incorporating consumption based inventories into climate policy are discussed

an econometric view on the estimation of gravity models and the calculation of trade potentials this paper presents an ar 1 model in the spirit of hausman and taylor zero differences between actual and in sample predicted trade flows large systematic differences between observed and in sample predicted trade flows only indicate model misspecification and econometric problems out of sample predictions make sense if countries of interest are in an early stage of the transformation process the gravity model remains an interesting tool for the calculation of counterfactuals e g the impact of catching up in gdp per capita in the ceec or of the reduction of trade costs via infrastructure investments or tariffs on bilateral trade etc for this line of research the difference between short term and long term influences could provide interesting insights

microeconometric analysis of residential water demand this paper develops a structural model for obtaining price elasticities and evaluating consumer s response to changes in nonlinear tariffs when only panel data on household consumption are available the model and the empirical strategy address problems implied by nonlinear tariffs existence of a fixed cost and use of limited data giving rise to a random effects model with a nonlinear individual effect results show that the estimated model does well at fitting data and demand is inelastic although elasticity varies by initial consumption block then i estimate welfare consequences of implementing several demand policies

measuring the impact of water supply interruptions on household welfare water scarcity frequently leads to a need for rationing the choice of an adequate rationing method should be based on the impact on consumer welfare that is produced by each rationing plan some rationing schemes such as the frequently used supply interruption method can be regarded as changes in the characteristics of the good in this case time availability that do not modify the pre set consumer budget under the standard theoretical restrictions on consumer behavior compensating or equivalent variations surpluses cannot be used to identify the impacts of these methods on household welfare in this paper we propose a set of sufficient conditions with respect to the utility function that allows for the evaluation of the compensating or equivalent variations surpluses associated with changes in goods quality even if those goods are considered to be essential for consumers we use these conditions to compare the welfare losses associated with the water supply cuts implemented in seville spain to those that would result if water was instead rationed using price changes

farm costs and food miles an assessment of the full cost of the uk weekly food basket changes in both farm production and food transport have resulted in the imposition of new levels of environmental costs this study analyses the full costs of foods in the average weekly uk food basket by calculating the costs arising at diverent stages from farms to consumers plates of the 12 commodities assessed livestock produce contributes the most costs per kg the external cost of uk agriculture up to the farm gate is estimated to be 1 51 bn yr i1 it is calculated that a switch to organic production could lead to avoided costs of 1 13 bn yr i1 agricultural and food produce accounts for 28 of goods transported on uk roads currently imposing estimated external costs of 2 35 bn yr i1 the contribution made by sea and air transport is currently trivial owing to low volumes however road transport to carry food from the shop to home is estimated to impose a further 1 28 bn yr i1 to total external costs subsidies not targeted at environmental improvements cost consumers 2 88 bn yr i1 thus the real cost of the per capita uk food basket 24 79 is calculated to be 2 91 more per person wk i1 11 8 if externalities and subsidies are included with farm externalities 81 p domestic road transport 76 p government subsidies 93 p and shopping transport 41 p contributing the most we assess a variety of scenarios for adoption of organic farming localised food systems and sustainable transport to indicate the substantial potential to reduce environmental costs in the uk food system 2005 elsevier ltd all rights reserved

demand specification for municipal water management evaluation of the stone geary form to specify demand in most water allocation problems researchers face a tradeoff between flexibility and parsimony flexible forms are less constraining on elasticity estimates but require large parameter sets that tend to cause poor out of sample forecasts and computational difficulties using a five year panel of texas municipalities the parsimonious stone geary form yields estimated demand functions that are comparable to flexible form results the stone geary specification also provides an estimate of the portion of water use that may not be responsive to price and is useful in analysing price structures and designing conservation policies

estimating residential water demand in the presence of free allowances the main aim of this paper is to quantify the impact of a rate structure which includes a free allowance on residential water consumption the analysis here differs from most previous research in that it explicitly recognizes that water consumption above the free allowance being sensitive to price responds less to social and climatic factors than consumption below the free allowance while the model specification and estimation procedures used here should be of interest to those interested in the demand for water the results using data for adelaide south australia on the determinants of water consumption should be of interest to water authorities

a discrete continuous choice approach to residential water demand under block rate pricing reply waldman is quite correct in noting that the microeconomic theory of block rate pricing in hewitt and hanemann hh 1995 is given for the general case of a k block rate structure whereas the econometric theory is largely confined to the case of exactly two blocks the extension in waldman to the more general case of k blocks is correct although the extension itself could be even more general if it addressed the nonnegativity of demand as is demonstrated below that no apparent attention was paid to the nonnegativity of demand in hh may be attributed to the fact that the need to do so was negated by a fortuitous assumption in the earlier work although that assumption that the errors are multiplicative and lognormally distributed was only maintained and not tested in hh i now estimate two models with the more common assumptions of linear demand and additive and normally distributed errors both with and without a modification for

an empirical survey of residential water demand modelling abstract the increased reliance on demand side management policies as an urban water consumption management tool has stimulated considerable debate among economists water utility managers regulators consumer interest groups and policymakers in turn this has fostered an increasing volume of literature aimed at providing best practice estimates of price and income elasticities quantifying the impact of non price water restrictions and gauging the impact of non discretionary environmental factors affecting residential water demand this paper provides a synoptic survey of empirical residential water demand analyses conducted in the last 25 years both model specification and estimation and the outcomes of the analyses are discussed

household adoption of water efficient equipment the role of socio economic factors environmental attitudes and policy using survey data of around 10 000 households from 10 oecd countries we identify the driving factors of household adoption of water efficient equipment by estimating probit models of a household s probability to invest in such equipment the results indicate that environmental attitudes and ownership status are strong predictors of adoption of water efficient equipment in terms of policy we find that households that were both metered and charged for their water individually had a much higher probability to invest in water efficient equipment compared to households that paid a flat fee

hourly earnings in the united states another look at unionization schooling sickness and unemployment using psid data this paper makes use of panel data to consider the effects of unionization schooling sickness and unemployment on individual earnings our results may be summarized as follows the unionization effect is around 15 20 this measure is consistently estimated controlling for both fixed individual attributes and serially uncorrelated measurement error sickness has little immediate impact but there is some indication that after 4 years earnings have fallen permanently by around 8 consequent on a 10 week spell of sickness a spell of unemployment on the other hand leads to a sharp fall in earnings but this effect decays rapidly leaving the possibility of a small permanent impact finally controlling for all fixed individual attributes we are unable to pin down the schooling effect with any accuracy owing to the absence of instruments that are both valid and effective within the data set

price and income elasticities of residential and industrial electricity demand in the european union this study examines the short and long run price and income elasticities of residential and industrial electricity demand in the european union between 1996 and 2016 instrumental variable models using the between estimator as well as dynamic panel models are employed to present robust estimates and to assess the impact of different methodologies on the reported elasticities the long run price elasticity of residential electricity consumption is estimated between 0 53 and 0 56 these elasticities are more inelastic than that of industrial electricity use which is reported between 0 75 and 1 01 the choice of different econometric methodologies has only moderate impact on the estimates while long run residential income elasticity estimates are moderately inelastic and estimated around 0 61 industrial electricity use tends to be closely tied to income with elasticities between 0 76 and 1 08 electricity demand in all sectors is highly price and income inelastic in the short run additionally population density temperatures and policy measures also influence sectoral electricity use the above estimates can aid the design of european energy and environmental policy

household water demand seasonal elasticities a stone geary model under an increasing block rate structure using household level panel data from tucson arizona and a unique set of highly disaggregated control variables we estimate residential demand for water via a stone geary specification the stone geary functional form allows price elasticity of demand to vary with quantity consumed price and income and enables estimation of a threshold level of consumption below which demand is considered perfectly price inelastic an encompassing test of consumer price response reveals evidence favoring a lagged average price specification rather than one using lagged marginal price the estimated model also finds substantial seasonal variation in price elasticity and declining consumer price responsiveness

specification of block rate price variables in demand models using a new model formulation and data from a sample of colorado utilities we investigated the price specification controversy marginal price versus average revenue when estimating residential water demand the improved statistical fit using average

international outsourcing and the productivity of low skilled labor in the eu this article presents first insights into the role of international outsourcing on the productivity of low skilled workers in eu manufacturing whereas in the short run international outsourcing exhibits a negative marginal effect on real value added per low skilled worker the long run parameter estimates reveal a positive impact this may be explained by imperfections in european labor and goods markets which prohibit an immediate adjustment in the factor employment and the output structure the change in the outsourcing intensity since 1993 alone acounts for a long run increase of about 6 0 in the real value added per low skilled worker jel c33 f14 f15

the shading and distancing of commerce when internalization is not enough abstract a political economy of degradation and of sustainability should account not only for the full range of production costs but the sources of those costs it should consider how the pursuit of wealth can deliberately or not lead to uncounted costs and unaccountable actors this article explores the conditions of cost generation and externalization especially those that are largely unintended and inadvertent it shows how the pursuit of wealth the expansion of markets the mobility of capital and the entanglements of production processes can lead to the unwitting generation and displacement of costs it analyzes competitive business strategy and patterns of production and consumption for their contribution to such costs business strategy and state policy tend to create a never ending search for frontiers however simulated and however unecological they may be the costs generated in those frontiers are a function of shading that is obscuring of costs and distancing the separation of production and consumption decisions both of which impede ecological and social feedback and create cognitive institutional and ethical lags between initial benefits and eventual full costs as distance increases along dimensions of geography culture bargaining power or agency negative feedback loops are severed stakeholders expand while decision making contracts environmental problems are displaced and shading and cost externalization increase the likelihood of sustainable resource use increases as distance is lowered as institutions locate decision authority in those who receive negative ecological feedback and who have the capacity and incentives to act on that feedback and as the burden of proof for economic interventions shifts to the interveners

price knowledge in household demand for utility services a household s decision to acquire price knowledge is endogenous in the demand for utility services and may affect elasticities and consumption levels a simultaneous equation model with endogenous switching is developed to evaluate the effects of price knowledge and other sources of heterogeneity results indicate informed households were more responsive to average and marginal price signals informed households also use less water but this is due to heterogeneity rather than price knowledge controlling for heterogeneity price knowledge actually increases monthly water usage the implications of accounting for differences in price knowledge in utility demand modeling and demand management policy are discussed

consumption and environment some conceptual issues abstract consumption ranks with population and technology as a major driver of environmental change and yet researchers and policymakers have paid it scant attention when the topic is addressed its conceptual foundations are either taken as self evident or are conflated with production overall economic activity materialism maldistribution population or technology the risk is to adopt the latest buzzword in the environmental debate stretch the concept to encompass all conceivable concerns and forfeit any advantage for analysis or for behavior change that may accrue to a new perspective on environmental problems consumption must be distinguished conceptually from other approaches to environmental problems one approach is to work within the consumption production dichotomy examining not just purchasing but product use and non purchase decisions a second approach one that challenges the prevailing dichotomy and its propensity to relegate consumption to a black box is to treat all resource use as consuming that is using up and ask what risks are entailed consumption can then be seen as material provisioning where risks increase with increasing distance from the resource as background misconsumption or overconsumption depending on the social concern raised or as a chain of decisions that compel the behaviors of restraint and resistance among producers pursuing the consumption and environment topic engenders resistance among a wide range of actors for reasons that are personal analytic and policy related nevertheless the topic appears to have the potential of helping analysts and others transcend conventional approaches to excess throughput

determinants of domestic water consumption in hermosillo sonora mexico this article presents a cross sectional study that explored the determinants of domestic water consumption in hermosillo mexico in a continuous 24 h water supply a probability sample with a confidence interval ci of 95 was established by applying a 65 question survey to collect data on 403 households consecutively the model reflecting the water consumption in hermosillo households was identified through a multiple regression analysis using ordinary least squares ols the analysis revealed that the statistically significant variables that explain the domestic water consumption in the home with a share of 31 6 were low water cost number of bathrooms in the household measured service supply use of purified bottled water per week in households and the number of female inhabitants after obtaining the model the monthly water consumption was calculated in a group of houses throughout the equation to compare it with the water consumption measured by the operating agency and it showed an acceptable approximation 78 90 the results contribute to improving the current understanding of factors influencing the use of the vital liquid and they may be useful in the development of policies to promote the sustainable use of water resources

urban residential demand for water in the united states further discussion using a new model formulation and data from a sample of colorado utilities we investigated the price specification controversy marginal price versus average revenue when estimating residential water demand the improved statistical fit using average

the value of scarce water measuring the inefficiency of municipal regulations abstract rather than allowing urban water prices to reflect scarcity rents during periods of drought induced excess demand policy makers have mandated command and control approaches primarily rationing the use of water outdoors while such policies are ubiquitous and likely inefficient economists have not had access to sufficient data to estimate their economic impact using unique panel data on residential end uses of water in 11 north american cities we examine the welfare implications of urban water rationing in response to drought using estimates of expected marginal prices that vary both across and within markets we estimate price elasticities specific to indoor and outdoor water use our results suggest that current policies do target water uses that households themselves are most willing to forgo nevertheless we find that rationing outdoor water in cities has costly welfare implications primarily due to household heterogeneity in willingness to pay for scarce water we find that replacing rationing policies with a market clearing drought price would result in welfare gains of more than 29 of what households in the sample spend each year on water

determinants of residential water demand in germany abstract we econometrically analyze the impact of several economic environmental and social determinants for the per capita demand for water in about 600 water supply areas in germany besides prices income and household size we consider the effects of population age the share of wells housing patterns precipitation and temperature we also explore why current per capita residential water consumption in the new federal states is about 30 lower than in the old federal states since average cost pricing may cause an endogeneity problem we apply instrumental variable procedures in addition to single equation ordinary least squares but find no evidence that prices are endogenous our estimation results suggest that the price elasticity of water demand in germany is around 0 24 the income elasticity is positive decreases with higher income levels and is at least three times higher in the new federal states than in the old federal states current differences in prices and income levels explain about one third of the gap in residential water use between the two regions household size and the share of wells have a negative impact on per capita water demand and water use increases with age finally the findings provide some evidence that rainfall patterns rather than total rainfall affect water consumption while temperature appears to have no impact at all all outcomes are robust to a log log and two types of semi log specifications for the water demand function

measuring welfare losses from interruption and pricing as responses to water shortages an application to the case of seville supply cuts and pricing policies can be used to ration water the appropriateness of a given policy depends on the losses in social welfare which it generates we find some drawbacks with the only method in the previous literature which deals with the issue of measuring welfare losses under supply cuts we propose an alternative method we compare the welfare losses under supply cuts and a pricing policy during the drought period of 1992 1996 in seville spain using both methods and find that the results vary widely from one method to the other

outsourcing labour productivity and wage inequality in the us a primal approach we investigate the linkages among outsourcing activities labour productivity and wage inequality for skilled and unskilled labour by employing a primal approach that involves estimating a nested constant elasticity of substitution production function using six digit north american industry classification system us manufacturing industries from 2002 to 2005 first we find that general outsourcing and international outsourcing have a skill biased impact on labour productivity however the skill biased impact of general outsourcing on labour productivity is larger than that of international outsourcing second we find that the wage gap between skilled and unskilled labour which is defined as their marginal productivity gap can be better explained by general outsourcing than by international outsourcing these two results imply that the wage inequality of us manufacturing industries during 2002 2005 was mainly due to the skill biased labour productivity effect of general outsourcing rather than that of

climate change and dietary choices how can emissions of greenhouse gases from food consumption be reduced abstract results from an analysis of greenhouse gas emissions and energy consumption during the life cycle of carrots tomatoes potatoes pork rice and dry peas consumed in sweden are presented and discussed the life cycle is delineated to the part of the production chain prior to purchase by the consumer the study shows that emissions expressed in g co2 equivalents are highest for pork and rice and lowest for potatoes carrots and dry peas the most important stages of emissions in the life cycle are identified for each of the different food items crop farming is the most important stage for rice and tomatoes while rearing of animals is the most important stage for pork and storage is the most important stage for carrots comparison with an energy analysis shows that important stages in the life cycle of food may be under evaluated when energy only is accounted for this may lead to a sub optimisation of pollution control exemplified by the case of transportation also it is shown that the choice of functional unit has a decisive influence on the outcome of the study the recommendation is to compare whole meals or diets with the same nutritional qualities a comparison of four meals composed of the food items under analysis shows that a meal with tomatoes rice and pork has nine times higher emissions than a meal made from potatoes carrots and dry peas emissions of greenhouse gases from consumption patterns based on the food items analysed are compared with an assumed sustainable limit of greenhouse gas emissions the conclusion is that current food consumption patterns in the developed countries exceed the level of sustainability by at least a factor of 4 prospects for achieving sustainable food consumption patterns are questionable in view of current trends in food demand

is all domestic water consumption sensitive to price control this paper presents a model of residential water demand based on the stone geary utility function which explicitly considers a threshold of water that is insensitive to price and a quantity that can adapt instantaneously to price changes first the threshold is assumed constant being then allowed to vary according to past levels of consumption a proxy for households water using equipment and habits a measure of the depreciation rate of habits is derived and the effectiveness of price and non price conservation measures are compared the results provide useful policy recommendations for the studied case of seville spain

efficiency and equity in natural resources pricing a proposal for urban water distribution service this paper focuses on the design of optimal prices for urban water distribution service in this context pricing should be aimed at achieving efficiency equity financial aspects and or public acceptability and transparency the proposed tariffs are based on the theoretical frameworks suggested by ramsey 1927 and feldstein 1972 as a prior step estimations of urban water demands and water costs are carried out for the spanish municipality of seville finally an empirical comparison in welfare terms is conducted between the proposed tariffs and those applicable in the year 2000

comparing residential water demand estimates under decreasing and increasing block rates using household data using a new model formulation and data from a sample of colorado utilities we investigated the price specification controversy marginal price versus average revenue when estimating residential water demand the improved statistical fit using average

an econometric estimation of industrial water demand in france this study investigates the structure of industrial water demand byestimating the derived demand for water on a sample of industrialestablishments located in the south west of france productiontechnologies are represented by short term variable cost functions andapproximated by a translog form industrial water use is modeled ashaving three components the quantity of water bought to a waterutility the quantity of autonomous water and the quantity of watertreated prior to use we include in this framework water effluents which are considered as a by product of the production process emittedby firms each of the three water components is treated as a separateinput and all are estimated as a system of simultaneous equations themodel is estimated on a sample of 51 industrial plants in the girondedistrict observed from 1994 to 1996 using seemingly unrelated regression sur and feasible generalized least squares fgls results ofestimations show that industrial firms are sensitive to water priceinputs network water elasticity is estimated at 0 29 it variesfrom 0 10 to 0 79 according to the type of industryconsidered autonomous water price elasticity is not significant elasticity for treated water is evaluated at 1 42 at themean sample and varies from 0 90 to 2 21 according to theindustry considered

understanding the energy gdp elasticity a sectoral approach abstract this paper uses per capita data for 132 countries over 1960 2010 to estimate elasticities of sectoral energy use with respect to national gross domestic product gdp we estimate models in both levels and growth rates and use our estimates to sectorally decompose the aggregate energy gdp elasticity our estimates show that residential energy use is very inelastic to gdp if primary solid biofuels are counted in energy use tallies especially at low income levels residential use of electricity is more tightly linked to gdp as is energy use by the transportation industrial and services sectors agriculture typically accounts for a small share of energy use and has a modest energy gdp elasticity the aggregate energy gdp elasticity tends to be higher for countries at higher income levels in large part because traditional use of primary solid biofuels is less important gasoline prices winter temperature population and land area are among other factors influencing sectoral energy use

estimating water demand under increasing block tariffs using aggregate data and proportions of users per block forming a strategy for the management of a water resource requires reasonable knowledge of the effects that alterations in the control variables bring on water use such knowledge of the determinants influencing domestic water demand constitutes an essential ingredient of a pricing policy for domestic water supply special attention should be paid to the effects of the level shape and frequency of the tariff since these are the variables that can be altered by the policy maker

biofuels and land use change sugarcane and soybean acreage response in brazil scientists and economists are increasingly worried that biofuels production is leading to land use changes in the form of competition with food crops or loss of natural ecosystems i estimate acreage conversion in response to shocks in sugarcane a biofuels feedstock and soybean thought to be affected by united states corn ethanol production prices in brazil at a national and regional level using county level data from 1973 to 2005 i consider a dynamic panel data model of input demand for agricultural land conditioning on price changes of other commodities the short run crop price elasticity of sugarcane acreage in brazil is estimated to be approximately zero whereas the elasticity of soybean acreage is 0 9 when both spot and futures prices change the regional estimates for soybeans show considerable variation and are highest in areas of ecological importance such as the cerrado sugarcane estimates are more homogeneous these results should be taken into account in impact assessments of biofuels

perception of price when price information is costly evidence from residential electricity demand a bstract residential electricity consumption is an example of a good for which it is costly to determine marginal price since price changes with the quantity purchased according to multistep block rate schedules this paper investigates the effect of the price information problem on consumers price perceptions an alternative hypothesis of average price perception is tested against the marginal price postulate which assumes wellinformed consumers the model which includes a price perception variable allows the estimation of the price to which consumers actually respond the empirical results support the hypothesis that consumers respond to average price perceived from the electricity bill

gasoline demand in the oecd an application of pooling and testing procedures abstract this study utilizes a pooled inter country data set finding the long run price elasticity falls in the range 0 55 to 0 9 depending on the choice of pooled estimators the estimators included the ols within and between country estimators plus five feasible gls estimators even allowing for a ten year distributed lag on price to reflect changes in auto efficiency characteristics the within country estimator yields appreciably more inelastic estimates than did the o s estimator which was heavily influenced by the between or inter country variation this difference raises intriguing questions for future research

price and income elasticities of residential water demand a meta analysis this article presents a meta analysis of variations in price and income elasticities of residential water demand meta analysis constitutes an adequate tool to synthesize research results by means of an analysis of the variation in empirical estimates reported in the literature we link the variation in estimated elasticities to differences in theoretical microeconomic choice approaches differences in spatial and temporal dynamics as well as differences in research design of the underlying studies the occurrence of increasing or decreasing block rate systems turns out to be important with respect to price elasticities the use of the discrete continuous choice approach is relevant in explaining observed differences

effect of price information on residential water demand microeconomic theory predicts that people decrease consumption when price increases the magnitude of the effect depending on price elasticity the law of demand however implicitly assumes that consumers know prices an assumption that is not always satisfied in markets with ex post billing when prices are not transparent elasticity estimates are potentially lower than their full information potential evidence of low price elasticity abounds in residential water demand studies limiting the effectiveness and desirability of using price signals as a conservation tool it is hypothesized that resident s sluggish response to price is partly due to the absence of price information on water bills differences in the informational content of bills are documented for the first time on the basis of sample bills collected from 383 utilities across the usa a standard aggregate water demand model is augmented with qualitative variables describing differences in billing information allowing such variables to a

residential water demand responds asymmetrically to rising and falling prices this paper econometrically estimates residential water consumption in germany between 2007 and 2013 based on a panel of almost 3000 supply areas in particular the analysis distinguishes periods o

the value of free water analyzing south africa s free basic water policy this paper analyzes south africa s free basic water policy under which households receive a free water allowance equal to the world health organization s recommended minimum of 6 kiloliters per month i structurally estimate residential water demand evaluate the welfare eects of free water and provide optimal price schedules derived from a social planner s problem i use a unique dataset of monthly metered billing data for 60 000 households for 2002 2008 from a particularly disadvantaged suburb of pretoria the dataset contains rich price variation across 18 dierent nonlinear tarischedules and includes a policy experiment which removed the free allowance i nd that without government subsidy the mean monthly consumption would decrease from 12 6 to 5 6 kiloliters which is below the clean water consumption recommended by the who however it is possible to reallocate the current subsidy to form an optimal tari without a free allowance which would increase welfare while leaving the water provider s revenue unchanged this optimal tariwould also reduce the number of households consuming below the who recommended level

household responses to increased water rates during the california drought this paper explores the use of fixed effects and maximum likelihood techniques to es timate household responses to water price in creases during the california drought estimates are based on bimonthly meter readings from 599 single family households in the alameda county water district over the period 1982 1992 before and after the introduction of a steeply increasing block rate price structure i find that household and monthly fixed effects models are not success ful in modeling water demand with these data however maximum likelihood models that ex plicitly consider the household s response to the rate structure result in plausible estimates of wa ter demand jel q25

convergence of the static estimation toward the long run effects of dynamic panel data models abstract this article focuses on the estimation of long run effects on panel data we show that the probability limit of the between estimator of a static relation whereas the true specification is a dynamic error components model converges to the long run effects

analysing rationing policies drought and its effects on urban users welfare analysing rationing policies during drought the aim of this paper is to study the impact on consumers of rationing policies implemented during water shortages water scarcity gives rise to the need for rationing and various methods including supply cutoffs can be used a model is devised to quantify the welfare losses associated with qualitive and quantitive restrictions based on virtual prices and using the consumer surplus as a welfare measurement welfare variations for different users have been calculated to achieve the aim information relative to seville spain has been used analysing the drought period that took place in the first half of the 1990s it has been possible to observe the main source that led to welfare losses for each kind of user

evidence on the specification of price in the study of domestic water demand the development of lakefront property in northern wisconsin has prompted in several towns minimum frontage zoning stricter than the state standard such zoning generates an economic loss by constraining development development effect and an economic

do residential water demand side management policies measure up an analysis of eight california water agencies abstract to assess the potential of price and alternative demand side management dsm policies as an urban water resource management tool an econometric model of residential demand is formulated and estimated this econometric model incorporates alternative dsm policy instruments such as water allocations use restrictions public education and increasing block pricing schedules the analysis relies on cross sectional monthly time series data for eight water agencies in california representing 24 of the state s population 7 1 million people results suggest that both price and alternative dsm policies were effective in reducing demand however the magnitude of the reduction in demand varied among policy instruments

nonparametric estimation of exact consumers surplus and deadweight loss we apply nonparametric regression models to estimation of demand curves of the type most often used in applied research from the demand curve estimators we derive estimates of exact consumers surplus and deadweight loss which are the most widely used welfare and economic efficiency measures in areas of economics such as public finance we also develop tests of the symmetry and downward sloping properties of compensated demand we work out asymptotic normal sampling theory for kernel and series nonparametric estimators as well as for the parametric case the paper includes an application to gasoline demand empirical questions of interest here are the shape of the demand curve and the average magnitude of welfare loss from a tax on gasoline in this application we compare parametric and nonparametric estimates of the demand curve calculate exact and approximate measures of consumers surplus and deadweight loss and give standard error estimates we also analyze the sensitivity of the welfare measures to components of nonparametric regression estimators such as the number of terms in a series approximation

international trade related food miles the case of canada abstract at the beginning of the 21st century imports of agricultural and food commodities have become a major part of many nations food baskets indeed the global food system has several merits for nations businesses and individual consumers well being however as increasing evidence suggests that we are approaching an era of climate change and scarcity of cheap energy sources the sustainability of that system must be examined one part of any food commodity chain is its food miles the distance the commodity travels from point of production to point of consumption the required energy and resulting emissions this paper presents a 1 year snapshot of canada s total import related food miles it presents an analysis of the distance imported foods traveled from around the world to major points of consumption in canada and documents the equivalent carbon dioxide emissions related to those imports it presents both a macro scale picture of the equivalent emissions related to transportation of imported food and a micro scale picture which focuses on specific commodities consumed in various parts of the country it then discusses policy implications for food sustainability overall the research highlights that about 30 of the agricultural and food commodities consumed in canada are imported resulting in food miles of over 61 billion tonnes km leading to annual emissions of 3 3 million metric tonnes of co 2 of the various agriculture and food commodities studied fruits and vegetables had the highest food miles related emissions

the random utility hypothesis and inference in demand systems in this paper the authors examine the consequences of adopting the random utility hypothesis as an approach for randomizing a system of demand equations random utility models are appealing since they allow the usual assumption of deterministic utility maximizing behavior by each consumer to coexist with the apparent randomness across individuals that is exhibited by data their results show that the use of random utility models implies that the disturbances of the demand equations may not be homoskedastic but must be functions of prices and or income copyright 1989 by the econometric society

residential water demand in the northwest of spain a panel of monthly aggregate data from the northwest of spain is used to estimate domestic water demand functions under linear and non linear tariffs price billing climatic and sociodemographic variables are used as explanatory variables the use of intraannual data constitutes a relevant contribution in the european context overall marginal price elasticity estimates lie between 0 12 and 0 17 summer only elasticities and elasticities associated with uses beyond the effectively free allowances seem significantly higher climatic variables significantly affect monthly use although probably less than in other wealthier and drier areas domestic water use appears to be a normal good

potential for pricing policies in water resource management estimation of urban residential water demand in zaragoza spain this paper presents an empirical study to estimate the urban residential water demand in zaragoza spain this allows the testing of the short run sensitivity of water demand to changes in a set of

information provision and consumer behavior a natural experiment in billing frequency abstract in this study i estimate a causal effect of increased billing frequency on consumer behavior i exploit a natural experiment in which residential water customers switched exogenously from bimonthly to monthly billing customers increase consumption by 3 5 5 in response to more frequent information this result is reconciled in models of price and quantity uncertainty where increases in billing frequency reduce the distortion in consumer perceptions using treatment effects as sufficient statistics i calculate consumer welfare gains equivalent to 0 5 1 of annual water expenditures heterogeneous treatment effects suggest increases in outdoor water use