public research and industrial innovations in germany this paper deals with the effects of publicly funded research at universities polytechnics and federal research labs on industrial innovations in germany we discuss the characteristics of companies that benefit from the findings of public research institutions in questioning 2 300 companies we found that less than one tenth of product or process innovating firms introduced innovations between 1993 and 1995 that would not have been developed without public research these new products amount to approximately 5 percent of all new product sales regressions show that firms own r d support the ability to absorb the findings of public research and turn them into innovations contrary to the widely held opinion that proximity to public research institutions does promote collaboration between firms and public research and increase the amount of received knowledge spillovers we found no higher probability of publicly supported innovations for firms in germany that are located near universities or polytechnics

stacking up the ladder a panel data analysis of tanzanian household energy choices energy use statistics in tanzania reflect the country s low level of industrialization and development in 2016 only 16 9 of rural and 65 3 of urban inhabitants in mainland tanzania were connected to some form of electricity we use a nationally representative three wave panel dataset 2008 2013 to contribute to the literature on household energy use decisions in tanzania in the context of the stacking and energy ladder hypotheses we firstly adopt a panel multinomial logit approach to model the determinants of household cooking and lighting fuel choices secondly we focus explicitly on energy stacking behaviour proposing various ways of measuring what is inferred when stacking behaviour is thought of in the context of the energy transition and presenting household level correlates of energy stacking behaviour thirdly since fuel uses have gender differentiated impacts we investigate women s bargaining power in the decision making process of household fuel choices we find that whilst higher household incomes are strongly associated with a transition towards the adoption of more modern fuels especially lighting fuels this transition takes place in a context of significant fuel stacking in tanzania government policy has been aimed mostly at connecting households to the electric grid however the public health environmental and social benefits of access to modern energy sources are likely to be diminished in a context of significant fuel stacking lastly we present evidence that the educational attainment of women in the household is an important aspect of household fuel choices

fuel demand elasticities for energy and environmental policies indian sample survey evidence india has been running large scale interventions in the energy sector over the last decades still there is a dearth of reliable and readily available price and income elasticities of demand to base these on especially for domestic use of traditional fuels this study uses the linear approximate almost ideal demand system la aids using micro data of more than 100 000 households sampled across india the la aids model is expanded by specifying the intercept as a linear function of household characteristics marshallian and hicksian price and expenditure elasticities of demand for four main fuels are estimated for both urban and rural areas by different income groups these can be used to evaluate recent and current energy policies the results can also be used for energy projections and carbon dioxide simulations given different growth rates for different segments of the indian population

activity choice labor allocation and forest use in malawi this article examines the determinants of activity choice affecting forest use among low income households in malawi data from three villages are used to estimate a system of household labor share equations for maize production forest employment and non forest employment a system estimation approach is used to identify factors influencing the competing and synergistic livelihood strategies which households undertake at the forest margin results from constrained maximum likelihood estimation indicate heightened incentives to degrade forests when returns to forest use are high factors reducing forest pressure include favorable returns to non forest employment secondary education of the household head and wealth

portfolio resampling review and critique a well understood fact of asset allocation is that the traditional portfolio optimization algorithm is too powerful for the quality of the inputs recently a new concept called resampled efficiency has been introduced into the asset management world to deal with estimation error the objective of this article is to describe this new technology put it into the context of established procedures and point to some peculiarities of the approach even though portfolio resampling is a thoughtful heuristic some features make it difficult to interpret by the inexperienced portfolio resampling review and critique a comment

household fuelwood demand and supply in nepal s tarai and mid hills choice between cash outlays and labor opportunity abstract subsistence households are a leading source of deforestation and their consumption of fuelwood in particular is important in many developing countries yet the empirical economic examinations of fuelwood consumption are sparse particularly for rural areas where the deforestation occurs and we would argue that forest policy is often designed without a good understanding of the potential responses of subsistence households to the new policy this paper addresses these issues with household evidence from the two major populated regions of nepal market prices labor opportunities the availability of substitutes and measure of access to the basic resource are the most reliable predictive variables for fuelwood consumption and production there are however regional differences and important distinctions between the elasticities of fuelwood collecting or purchasing households with respect to these predictive variables the difference between collecting and purchasing households is notable it recommends forestry policies that target the labor opportunity and the physical resource in regions where collecting households dominate and policies that affect the fuelwood market itself in regions where purchasing households are important a second interesting finding is that fuelwood is relatively scarcer prices are higher in the mid hills and both collecting and purchasing households in this region are beginning to respond to deforestation by using their own land for fuelwood production

migration and fuel use in rural mexico many households in developing countries rely on renewable natural resources as their main source of energy collecting and burning firewood requires a considerable amount of time has negative health consequences and can cause deforestation and depletion of local resources if forests are not properly managed a transition from traditional to modern fuels can benefit households by reducing these negative effects migration a quintessential feature of development may facilitate this transition but its impacts on fuel choice are theoretically ambiguous it can reduce the household labor available for firewood collection and provide cash to purchase substitutes however it has an income effect that changes the demand for home cooked food and energy to cook it firewood or gas could be used to meet the increase in energy demand to resolve this theoretical ambiguity we use an instrumental variables method with household panel data from rural mexico and investigate the impact of mexico to us migration and remittances on gas expenditures and household labor allocated to firewood collection sending a migrant to the united states causes a significant decrease in reliance on firewood collection and an increase in both stove and gas purchases these findings have potentially far reaching environmental implications as labor moves off the farm

a survey of agricultural household models recent findings and policy implications semicommercial farms that produce multiple crops make up a large part of the agricultural sector in developing economies these farms or agricultural households combine two fundamental units of microeconomic analysis the household and the firm traditional economic theory has dealt with these units seperately but in developing economies in which peasant farms dominate their interdependence is of crucial importance researchers have developed models of agricultural households that combine producer and consumer behavior in a theoretically consistent fashion recent empirical applications of these models have extended them and expanded the range of policy issues which can be investigated using this general framework this article reports the results of empirical applications of this model in india indonesia japan the republic of korea malaysia nigeria senegal sierra leone taiwan and thailand it provides a comparative analysis of the policy implications of the approach for such matters as the welfare of farm households the size of marketed surplus the demand for nonagricultural goods and services and for hired labor and the availability of budget revenues and foreign exchange

equity externalities and energy subsidies the case of kerosine in indonesia abstract this paper examines two arguments used to justify the subsidy provided kerosine the primary commercial fuel of indonesian households one argument holds that the subsidy reduces deforestation externalities resulting from wood gathering econometric analysis of a large cross section of households finds that firewood kerosene substitution is very limited in java where the deforestation problem is most severe so that kerosene subsidy is not an effective means of alleviating the problem the second argument holds that social equity requires the subsidization of basic needs such as kerosene it is found that the kerosene subsidy disproportionately benefits urban and wealthier households

forests fuelwood and livelihoods energy transition patterns in eastern indonesia the central thesis of the energy ladder model is a unidirectional transition from primitive to advance fuel with increased affluence of households although now largely discredited this assumption remains a foundation of laissez faire policies that anticipate energy transition resulting spontaneous forest recovery with economic development our results suggest that such policies can undermine broader policy objectives and actually worsen forest conditions in rural indonesia based on a case study of forest margin communities in eastern indonesia we demonstrate that fuel subsidy reform did little to reduce rural household demand for fuelwood while dramatically increasing fuelwood demand for processing agricultural products our results show how household decisions related to fuel sources are affected by non economic considerations and external factors such as opportunities to sell fuelwood we argue that policy interventions that encourage energy transition of households do not necessarily improve forest conditions as household fuelwood use may be a symptom rather than a driver of deforestation and forest degradation thus policies to improve forest conditions should focus more on addressing the market environment of forest margin communities providing energy alternatives to small industries that are often the larger consumers of fuelwood

the effect of labor market performance on deforestation in developing countries under open access an example from rural nepal abstract this research examines the deforestation behavior of smallholder agriculturalists as off farm labor market conditions change a model of a representative village is proposed which incorporates dependence on open access forests for fuelwood and animal raising dynamic simulations are then presented which compare time paths of forest stocks deforestation levels and household labor supply under a variety of conditions despite the open access regime assumed in the model with a perfect albeit low wage off farm labor market the agro forestry system in nepal is basically stable an alternative model where there is no off farm labor market eliminates the important features of adjustment to deforestation which generate forest stability suggesting that the availability of off farm opportunities is an important determinant of deforesting behavior and equilibrium forest stock levels

expected utility asset allocation most asset allocation analyses use the mean variance approach for analyzing the trade off between risk and expected return analysts use quadratic programming to find optimal asset mixes and the characteristics of the capital asset pricing model to determine reasonable optimization inputs this article presents an alternative approach in which the goal of asset allocation is to maximize expected utility where the utility function may be more complex than that associated with mean variance analysis inputs for the analysis are based on the assumption of asset prices that would prevail if there were a single representative investor who desired to maximize expected utility

portfolio selection based on return risk and relative performance markowitz introduced the concept of portfolio selection based on return and variance recognition that many investors evaluate performance relative to a benchmark led to the idea of portfolio selection based on return and relative risk for many investors both approaches fail to yield satisfactory results although they acknowledge the importance of benchmarks in the decision process they are not indifferent to the variance of absolute returns in this situation a utility function that measures return variance and tracking error is more appropriate analysis of this utility function shows that its set of efficient portfolios includes the mean variance efficient set the mean tracking error efficient set and all convex combinations of these two sets optimization with this utility function may find solutions that investors will actually use

household biomass energy choice and its policy implications on improving rural livelihoods in sichuan china abstract it is widely known that a switch from traditional biomass energy to modern clean safe and efficient energy could improve local rural livelihoods by enhancing the access to high quality energy and reducing the negative impacts of traditional biomass energy on health environment and living standards hence in this paper we used alternative specific conditional logit model asclm to examine the rural household energy choice behaviors in sichuan province of china from the perspective of revealed and stated preferences the results show that the fuel switching in our study region is not a simple unidirectional process from traditional biomass energy to modern fuels as incomes improve household energy choice behaviors could be not only affected by energy specific characteristics such as fuel price smoky level and safety risk but also influenced by household specific factors such as income level age and educational level of the decision maker household demographic structure number of people frequently eating at home distance to the nearest biomass collecting spot and household location suggesting that government should attach more importance to simultaneously improve energy quality control energy price and enhance household socio economic status

residential bioenergy heating a study of consumer perceptions of improved woodstoves abstract consumers choices play a key role for the development of biomass heating in the residential sector the city of oslo has granted subsidies to households who change to new improved low emission woodstoves the purpose of this study is to expand the knowledge about users experiences and attitudes to residential biomass heating an adapted model of the theory of planned behavior was used to model households inclination to continue using their woodstoves for heating more than 800 questionnaires were collected from households that recently had invested in an improved woodstove the respondents were satisfied with the new woodstoves the respondents also considered themselves competent to use and maintain the stove and few had problems acquiring fuelwood further analyses showed that the intention to continue to use the new woodstove depends on economic benefits heating performance perceived time and effort to operate the stove environmental effects of heating as well as perceived subjective norm the results imply that when marketing a modern technology for bioenergy heating both public authorities and producers should consider issues related to the users perception of subjective norm such as perceived status of using bioenergy or environmental concerns when designing campaigns to promote the use of woodstoves

academic research and industrial innovation the purpose of this study is to estimate the extent to which technological innovations in various industries have been based on recent academic research and the time lags between the investment in recent academic research projects and the industrial utilization of their findings because no attempt to my knowledge has been made to estimate the social rate of return from academic research we also make some rough and tentative estimates of this sort while the results are subject to many limitations discussed below they should be of interest to public policy makers concerned with science and technology as well as to

preferences for domestic fuel analysis with socio economic factors and rankings in kolkata india abstract the choice of domestic fuel is a matter of great concern for households and policy makers in india this paper investigates the demand for domestic fuels when households face four choices fuelwood coal kerosene and lpg the study is based on a survey of 500 households in kolkata india the demand estimates are conducted using a two stage process where the first stage investigates choice and the second the quantity used determinants of fuel demand are identified and their relative importance shown extending the study the paper also analyses the choice of the main cooking fuel in terms of the households stated rankings of six fuels for five attributes the policy discussion indicates that subsidies have less potential to reduce polluting fuels such as coal and fuelwood due to weak cross price elasticities while increased availability of lpg and potentially also increased awareness of indoor air pollution have greater prospect

bayes stein estimation for portfolio analysis in portfolio analysis uncertainty about parameter values leads to suboptimal portfolio choices the resulting loss in the investor s utility is a function of the particular estimator chosen for expected returns so this is a problem of simultaneous estimation of normal means under a well specified loss function in this situation as stein has shown the clas sical sample mean is inadmissible this paper presents a simple empirical bayes estimator that should outperform the sample mean in the context of a portfolio simulation analysis shows that these bayes stein estimators provide significant gains in portfolio selection problems

spatial patterns of market participation and resource extraction fuelwood collection in northern uganda while distance to markets is a key determinant of market participation for households that are dependent on natural resources the distance to the resource stock is also essential thus a household s location with respect to markets and the resource stock determines household market participation and associated resource degradation applying a discrete choice framework for fuelwood collection in a developing country we characterize the spatial pattern of market participation regimes and forest use all else being equal autarkic households are closest to the forest and furthest from the market buyer households are closest to the market and furthest from the forest and seller households are at intermediate distances empirical tests based on survey data from northern uganda support the predictions from our theoretical model our findings have important implications for understanding the spatial patterns of forest degradation and determining the control group when designing impact evaluations of the effectiveness of development and conservation interventions

low quality or high quality coal household energy choice in rural beijing abstract household low quality coal consumption contributes to severe haze pollution in china in response subsidy policies on high quality coal consumption and the adoption of new type coal stoves have been implemented using survey data in rural beijing this paper characterizes the determinants of coal consumption and switching behavior between low quality and high quality coals to this end we apply bivariate probit regression and tobit regression to evaluate the effectiveness of government policies and the influence of cognitive psychological and socioeconomic factors on coal consumption behaviors our empirical results reveal that prosociality and local environmental concern play crucial roles in household choices and consumption behaviors between two types of coals but global environmental concern does not the promotion of new type coal stoves significantly facilitates the transition from low quality to high quality coal while price subsidies on high quality coal do not influence market acceptance of high quality coal these results demonstrate the importance of cognitive psychological factors and promotion policies on coal consumption behavior overall we suggest that an education campaign or program regarding local environmental awareness prosocial values and behaviors and on new type coal stoves should be further promoted to accelerate the transition from low quality to high quality coal

institutions supporting technical advance in industry elsewhere 1982 economists beliefs that modern capitalism is a fine innovation generating machine have no intellectual grounding in contemporary neoclassical theory the twin theorems take technologies as given the apparent effectiveness of capitalism in this arena must reside in characteristics and mechanisms other than those featured in the microeconomic theory textbooks in our book we attempt to analyze these it also is true that the capitalist engine is a much more complicated one than many economists seem to think i presently am

fuelwood consumption and forest degradation a household model for domestic energy substitution in rural india this paper disusses domestic en ergy supply and demand in rural india links be tween forest scarcity and household fuel collec tion are analyzed in a non separable household model focusing on substitution of non commer cial fuels from the commons and the private do main based on data from villages bordering a protected area a novel maximum entropy ap proach is used for estimation it is found that households respond to forest scarcity and in creased fuelwood collection time by substituting fuels from private sources for forest fuelwood however the magnitude of the response appears insufficient to prevent current fuelwood collection practices from causing serious forest degrada tion jel q24

household energy demand in kenya an application of the linear approximate almost ideal demand system la aids abstract this paper estimates price and fuel expenditure elasticities of demand by applying the linear approximate almost ideal demand system la aids to 3665 households sampled across kenya in 2009 the results indicate that motor spirit premium msp automotive gas oil ago and lubricants are price elastic while fuel wood kerosene charcoal liquefied petroleum gas lpg and electricity are price inelastic kerosene is income elastic while fuel wood charcoal lpg electricity msp and ago are income inelastic the results also reveal fuel stack behaviour that is multiple fuel use among the households main policy implications of the results include increasing the penetration of alternative fuels as well as provision of more fiscal incentives to increase usage of cleaner fuels this not withstanding however the household income should be increased beyond a certain point for the household to completely shift and use a new fuel

why have improved cook stove initiatives in india failed summary an estimated 2 7 billion people cook meals on biomass fueled brick stone and clay stoves scarcity of wood and negative impacts on health and environment have motivated efforts to design and distribute improved cook stoves in developing countries in india adoption is limited despite massive promotion over many decades existing research suggests that many rural women in india do not want improved stoves and those who do face obstacles to adoption we step back from the many good case studies to examine the broader story of improved cook stoves ics in india we do so by bringing together technical research of applied science and narrative critique of social science rather than assuming a priori that traditional stoves require replacement we ask why indian cook stoves been a magnet for so much attention why adoptions rates have remained low and what lessons might be learned from a broad multi disciplinary perspective our approach is critical and reflexive given our own involvement in ic efforts and puts gender at the center our big picture review shows that the indian chulha for all its problems is a remarkably successful technology which also satisfies several important household needs hence targeting this device for obsolescence has profound implications that cannot be reduced to energy consumption or environmental hazards rural women do not prioritize ics but addressing their priorities requires either capital intensive investment or challenging powerful institutions in contrast ic interventions are relatively cheap decentralized mechanical and seemingly apolitical hence their popularity in development programs our review of chulha research leads us to reject both the optimism of development planners who frame such problems as technical and the antagonistic pessimism of their critics searching for a middle ground requires stepping back from the dogma of efforts to improve biomass cook stoves

building on poor people s capacities the case of common property resources in india and west africa revised version of a paper commissioned by the international development research centre idrc of canada for a world bank conference on poverty environment growth linkages held in washington dc march 1999

household fuel use in developing countries review of theory and evidence because of recent concerns about the negative externalities of traditional fuel use on the environment and health the issue of the household fuel transition in developing countries from dirty fuels towards clean fuels has received growing research attention this paper provides an up to date survey of the economic literature on household fuel use in these countries first we present the conceptual and theoretical frameworks then we discuss the empirical results that show how a wide range of factors drive the household fuel transition finally we suggest priorities for policy initiatives and highlight areas of future research

female labor force participation and household dependence on biomass energy evidence from national longitudinal data this research received financial support from the food policy institute at the australian national university

impact on firms of the use of knowledge external sources a systematic review of the literature this study summarizes the main conclusions from a systematic review of the empirical literature regarding the impact on firms of the use of knowledge external sources universities research institutes and knowledge intensive business services with the aim to organize the literature we classify the different works according to the research question addressed i which firms use knowledge external sources ii do firms using knowledge external sources achieve better results and iii which firms benefit the most from using knowledge external sources stylized facts are that larger more r d intensive and high tech firms are more likely to use knowledge external sources and that use of knowledge external sources is associated to firms higher technical results less attention has been paid to the third question and evidence is not conclusive several recommendations for future research emerge first to take in greater consideration methodological issues so that potential biases in the results caused by sample selection and endogeneity are handled properly second to pay more attention to heterogeneous outcomes third to use continuous indicators of depth and breadth of links allowing for non linear relationships and fourth to extend evidence for developing countries and service industries

the population problem theory and evidence this study is concerned with the relationships among population growth poverty and environmental degradation with particular focus on the situation in developing countries the author rejects the concept of a general theory of fertility behavior in favor of an interpretation of these relationships which might be applicable to certain situations in the poorest parts of the indian subcontinent and sub saharan africa such situations include unacceptable risks of maternal death for poor illiterate women and a condemnation to extreme poverty in conditions of the deterioration of local resources and of the environment the author concludes that population growth rates are too high in certain specific areas and that an appropriate policy reaction to such conditions would be to try to change the options that men and women face so that their reasoned choice would be to lower their fertility

naive diversification strategies in defined contribution saving plans there is a worldwide trend toward defined contribution saving plans and growing interest in privatized social security plans in both environments individuals are given some responsibility to make their own asset allocation decisions raising concerns about how well they do at this task this paper investigates one aspect of the task namely diversification it is shown that some investors follow the 1 n strategy they divide their contributions evenly across the funds offered in the plan consistent with this naive notion of diversification it is found that the proportion invested in stocks depends strongly on the proportion of stock funds in the plan

stoves or sugar willingness to adopt improved cookstoves in malawi malawi has set a target of adoption of two million improved cookstoves ics by 2020 meeting this objective requires knowledge about determinants of adoption particularly in rural areas where the cost of traditional cooking technologies and fuels are non monetary and where people have limited capacity to purchase an ics we conducted a discrete choice experiment with 383 households in rural malawi asking them if they would chose a locally made ics or a package of sugar and salt of roughly equal value six months later we assessed adoption and stove use patterns sixty six percent of households chose the ics we find that having a larger share of crop residues in household fuel supply awareness of the environmental impacts of woodfuel reliance time the primary cook devotes to collecting fuelwood and peer effects at the village level increase the odds of choosing the ics having a large labor supply for fuelwood collection and experience with a non traditional cooking technology decreased the odds of choosing the ics in a rapid assessment six months after stoves were distributed we found 80 of households were still using the ics but not exclusively our findings suggest considerable potential for wide scale adoption of ics in malawi

the determinants of household energy demand in rural beijing can environmentally friendly technologies be effective with the recent rapid economic growth total energy demand in rural china has increased dramatically and the energy structure is in the transition from non commercial to commercial sources simultaneously it is expected that households in rural areas will face energy shortages and additional environmental problems unless they have more access to renewable energy technologies however little is known about i the transition of energy use patterns and ii whether introduced technologies have been effective to analyze these issues we estimated the energy demands of rural households by using survey data taken from beijing s ten suburban districts the data contain information on both non commercial and commercial energy use key characteristics of the households and several renewable energy technologies our empirical analysis yielded three main results first the per capita income is a key factor in the per capita energy consumption more specifically the marginal increase or marginal change in per capita coal consumption strongly diminishes or declines as per capita income increases second coal and liquefied petroleum gas lpg prices do not exhibit substitution effects but an increase in these prices has strong negative effects on the use of these energy resources third renewable energy technologies are identified to reduce coal consumption and to improve energy efficiency overall these findings suggest a positive perspective if the chinese government were to design appropriate policies associated with renewable energy technologies and related energy prices then coal consumption can be reduced in the near future and the substitution to cleaner energy use will accelerate therefore a smooth energy transition in rural china could be made in a more environmentally sustainable manner

poverty and environmental degradation a review and analysis of the nexus abstract there is much controversy surrounding the poverty environmental degradation nexus the predominant school of thought argues that poverty is a major cause of environmental degradation and if policy makers want to address environmental issues then they must first address the poverty problem another school of thought argues that a direct link between poverty and environmental degradation is too simplistic and the nexus is governed by a complex web of factors in this paper a formal structure for analyzing the complex web of factors is formulated and used to review the existing literature on the links between poverty and the degradation of four natural resource sectors the analysis highlights the important role institutional and market failure in encouraging agents from various income groups to exhibit unsustainable activities which in turn forces some of the agents to fall into poverty another important factor is the role of conflicts between different agents income groups in the povertyenvironmental degradation nexus the analysis also highlights the presence of feedback loops between environmental degradation and poverty

the benefits of differential variance based constraints in portfolio optimization abstract the main problem of portfolio optimization is parameter estimation error various methods have been suggested to mitigate this problem among which are shrinkage resampling bayesian updating naive diversification and imposing constraints on the portfolio weights this study suggests two substantial extensions of the constrained optimization approach the variance based constraints vbc and the global variance based constraints gvbc methods by the vbc method the constraint imposed on the weight of a given stock is inversely proportional to its standard deviation the higher a stock s sample standard deviation the higher the potential estimation error of its parameters and therefore the tighter the constraint imposed on its weight gvbc employs a similar idea but instead of imposing a sharp boundary constraint on each stock a quadratic cost is assigned to deviations from the naive 1 n weight and a single global constraint is imposed on the total cost of all deviations comparing ten optimization methods we find that the two new suggested methods typically yield the best performance as measured by the sharpe ratio gvbc ranks first these results are obtained for two different datasets and are also robust to the number of assets under consideration

household energy mix in uganda abstract this paper presents evidence that household energy use in uganda conforms to the energy ladder theory as household income increases solid and transitional fuel use evolves in an inverse u manner while electricity consumption shows a direct relationship with income public infrastructure provision income and education are the key variables which can be targeted to reduce household dependence on solid fuels while increasing non solid fuel use while education and public infrastructure have varying impacts on rural and urban households energy mix these variables generally reduce rudimentary fuel use and increase modern fuel consumption timely investment in electricity infrastructure is necessary to cater for burgeoning electricity demand as households become affluent strategies for reforestation dissemination of improved cookstoves relieving supply side constraints for modern fuels and staggered payment options to lower the cost of entry for modern fuels can improve ugandan households energy security

startup costs and the decision to switch from firewood to gas fuel firewood remains a key source of energy for households in developing countries contributing to forest degradation and deforestation the adoption of alternative fuels may be hindered by high startup costs and this problem may be compounded by restrictions in credit availability we use survey data to examine how credit access affects firewood consumption in guatemala our results suggest that access to credit plays a statistically significant role in determining firewood consumption through its effect on the ability to purchase a gas stove however simulations suggest that these effects are small and that subsidizing stoves would be amore promising policy for reducing firewood consumption

rising wages and energy consumption transition in rural china abstract residential energy consumption in rural china is undergoing a transition from traditional biomass energy to modern commercial energy this paper examines the impact of rising wage rates on energy consumption mix in rural china using a unique panel data set from our two round surveys of 409 rural households in 4 provinces the results show that the wage rate at the village level has a significant negative impact on traditional biomass energy consumption and significant positive effects on consumption of electricity and new renewable energy in rural china as traditional biomass energy is mainly collected with family labor and is relatively labor intensive an increase in rural wage rates would enhance the opportunity costs of traditional biomass energy leading to a reduction in biomass energy consumption continuously rising rural wage rates could accelerate the transition from biomass energy to electricity in rural areas these findings could have important policy implications not only for indoor air quality and environmental and health issues in rural areas but also for greater security in rural energy supply and policies to incentive farmers to better utilize biomass resource after harvest

household energy choice and consumption intensity empirical evidence from bhutan abstract this paper uses data from three bhutan living standard surveys blss 2003 blss 2007 and blss 2012 to examine the trends and patterns of household energy consumption and identify and analyze the factors that influence household energy choices consumption intensity and the per capita household expenditure on energy sources in bhutan during the last decade significant numbers of bhutanese households have switched to cleaner energy sources empirical results show that a household s choice of cleaner energy sources is driven by income level and household wealth the age gender and education of the household heads access to electricity and location education and income have a differential role on the choice of clean or dirty fuel wealthier and more educated households use and rely more on clean sources of energy like electricity and liquid petroleum gas while poorer households use and rely on dirty fuel such as fuelwood and kerosene the study shows that female headed households are more likely to choose cleaner fuels and above all the availability of a clean and cost effective source of energy within proximity to the household is an important factor in the adoption of clean energy several models using a variety of alternative independent variables such as proxies for education and wealth were estimated and confirmed the robustness of the results

resource constraints as triggers of radical innovation longitudinal evidence from the manufacturing sector abstract despite the significant role of radical innovation as a driver of firm growth and performance the consequences of resource constraints for radical innovation outcomes remain unknown our paper addresses this gap we combine arguments from entrepreneurship theory and the theory of recombinative innovation to construct an overarching theoretical framework that argues why resource constraints can promote rather than impede radical innovation we then build hypotheses on two specific resource constraints knowledge and financial and test these by a lagged variable random effects tobit model with longitudinal data from an exceptionally large and detailed innovation survey controlling for absorptive capacity firm age and firm growth we find full support for the hypothesis that knowledge constraints spur radical innovation and partial support for the hypothesis that financial constraints spur radical innovation we discuss the theoretical significance of these findings and point to managerial implications and paths for future research

bayesian and capm estimators of the means implications for portfolio selection abstract this paper compares active investment policies under three alternative models for estimating expected stock returns the historical sample mean a shrinkage or bayesian estimator and a capm based estimator the out of sample performance of actively managed u s industry portfolios is analyzed for these three estimators over the period 1931 to 1987 it is found that the classical method based on historical means and covariances leads to the worst forecasts and out of sample performance and is generally outperformed by shrinkage estimators an active portfolio with expected returns based on the capm produced the best results among all actively managed portfolios this strategy as we show closely matches a simple buy and hold the market rule

household preferences for cooking fuels and inter fuel substitutions unlocking the modern fuels in the nepalese household different cooking fuels are associated with various economic and environmental challenges such as increased economic costs indoor air pollution deforestation and deterioration of public health in this study we assess the impact of various socioeconomic factors in a household s cooking fuel choice and motive for making a transition toward cleaner fuels this study uses household level cross sectional data 2011 and pooled data 1996 2004 and 2011 from the nepal living standard survey we use multinomial and binomial logit models for the empirical analysis the results suggest that along with household income other social and ecological factors play a critical role in inter fuel switching decisions we find that transferring property rights of government owned forests to the communities encourages households to move towards cleaner cooking fuels we also find that household head s education distance to the firewood sources energy access status and household income are significant factors influencing the households fuel choice decisions the policy implication is that increasing information spillover involving local communities in forest management and expanding alternative socioeconomic opportunities such as jobs and modern fuels in the remote regions play a vital role in encouraging the households to move towards cleaner energy sources

the environmental impact of poverty evidence from firewood collection in rural nepal abstract we investigate determinants of household firewood collection in rural nepal using 1995 96 and 2002 3 world bank living standards measurement survey lsms data we incorporate village fixed effects endogenous censoring measurement error in living standards and heterogeneous effects of different household assets we find no evidence in favor of the poverty environment hypothesis the evidence for the environmental kuznets curve depends on the precise measure of living standards and time period studied firewood collections fall with a transition to modern occupations and rise with increasing population and household division the local interhousehold collection externality is negligible indicating that policy interventions are justified only by ecological considerations or nonlocal spillovers

fuelling calorie intake decline household level evidence from rural india summary in india average calorie intake has declined even as real monthly expenditure has increased since cross sectional evidence suggests a positive relationship between the two variables the trend emerges as a major puzzle using household level data from four recent rounds of national sample survey data on consumption expenditure and a novel instrumental variable estimation strategy we find that rising expenditure on non food items is one of the factors that has led to the calorie intake decline we provide causal evidence for such a food budget squeeze in the case of one type of non food item viz expenditures on cooking fuel

identifying a sustained pathway to multidimensional poverty reduction evidence from two chinese provinces poor rural households in developing countries often endure many faceted burdens including monetary poverty nutrition deficiency and energy shortage due to reliance on limited local natural resourc

the ecological footprint of poverty alleviation evidence from mexico s oportunidades program abstract we study the consequences of poverty alleviation programs for environmental degradation we exploit the community level eligibility discontinuity for a conditional cash transfer program in mexico to identify the impacts of income increases on deforestation and use the program s initial randomized rollout to explore household responses we find that additional income raises consumption of land intensive goods and increases deforestation the observed production response and deforestation increase are larger in communities with poor road infrastructure this suggests that better access to markets disperses environmental harm and that the full effects of poverty alleviation on the environment can be observed only where poor infrastructure localizes them

the heart kuznets curve understanding the relations between economic development and cardiac conditions abstract as countries turn wealthier some health indicators such as child mortality seem to have well defined trends however others including cardiovascular conditions do not follow clear linear patterns of change with economic development abnormal blood pressure is a serious health risk factor with consequences for population growth and longevity as well as public and private expenditure in health care and labor productivity this also increases the risk of the population in certain pandemics such as covid 19 to determine the correlation of income and blood pressure we analyzed time series for the mean systolic blood pressure sbp of men s population mmhg and nominal gross domestic product per capita gdppc for 136 countries from 1980 to 2008 using regression and statistical analysis by pearson s correlation r our study finds a trend similar to an inverted u shaped curve or a heart kuznets curve there is a positive correlation increase gdppc increase sbp in low income countries and a negative correlation in high income countries increase gdppc decrease sbp as country income rises people tend to change their diets and habits and have better access to health services and education which affects blood pressure however the latter two may not offset the rise in blood pressure until countries reach a certain income investing early in health education and preventive health care could avoid the sharp increase in blood pressure as countries develop and therefore avoiding the heart kuznets curve and its economic and human impacts

effect of fuelwood scarcity and socio economic factors on household bio based energy use and energy substitution in rural ethiopia abstract in ethiopia biomass is predominantly utilized for household energy needs often using inefficient rudimentary stoves which cause adverse environmental and welfare effects this paper examined the contribution of biomass resources to rural household energy use and energy substitution the analysis applied the ordinary least square in the final stage estimation of fuelwood and overall biomass energy consumption by using predicted shadow prices the paper used tobit model to estimate charcoal and agricultural fuel consumption due to the presence of censoring an increase in fuelwood shadow price was associated with reduced household fuelwood consumption with price elasticity of 0 38 the cross price elasticity between fuelwood and agricultural fuels revealed no evidence of energy substitution which conforms to the findings of previous studies household access to electricity was associated with lower household biomass energy utilization but kerosene was not fuelwood substitute household energy use conformed to the fuel stacking or multiple fuel use concept but households preferred modern energy options as welfare increased in areas where modern energy is available this suggests that there is a promising prospect for fuel transition but access to modern energy and economic growth have key roles the findings suggest that a concerted policy effort is required that would help diversify rural livelihoods improve living standards and encourage economic growth encourage inter fuel substitution through improved modern energy access and afforestation to increase biomass supply

a ladder within a ladder understanding the factors influencing a household s domestic use of electricity in four african countries abstract according to the energy ladder hypothesis electricity is at the top of the energy ladder of household energy use that depends primarily on wealth status income and education levels of the users however it is often observed that households with higher income wealth and education levels do not use electricity for all domestic activities such as lighting heating and cooking creating a ladder within a ladder using a comprehensive data set from the living standard measurement study from four african countries ethiopia malawi tanzania and uganda covering 17 000 households this paper investigates the factors determining a household s adoption of electricity for lighting only and for lighting and cooking the results of a multinomial logit model and an ordered probit model show that demographic characteristics a household s wealth and human capital access to markets and remoteness greatly accelerate a household s use of electricity for light and cooking which provides evidence of a ladder within a ladder

the economic relevance of sustainable agroforestry practices an empirical analysis from tanzania abstract this paper investigates the economic relevance of sustainable behavior of agroforestry practices for smallholders using the example of firewood exploitation in rural tanzania three questions are addressed 1 to what extent do households behave sustainably regarding firewood extraction from agroforestry 2 which factors determine the likelihood of households practicing sustainable agroforestry 3 are sustainably behaving households better off in terms of income compared to households practicing unsustainable agroforestry the analysis is based on cross sectional data of 314 households a sustainability indicator shows that the share of sustainable households varies between 14 and 41 depending on the underlying wood growth rate the results of the logistic regression indicate that property rights regarding the ownership of agricultural land and environmental awareness increase the likelihood of sustainable firewood extraction empirical evidence from the quantile regression reveals that poorest households generate higher income if they extract firewood unsustainably the opposite is true for households of upper income percentiles thus the poor are likely to increase environmental degradation to generate more income causing a downward spiral of the poverty environment trap resulting in income losses in the long run households with a per capita income of 524 tzs or more manage their tree stocks sustainably

firms transfer strategies with universities and the relationship with firms innovation performance based on a representative sample of swiss firms we empirically investigated strategies for knowledge and technology transfer ktt activities between business firms and universities as well as other public research institutions based on a cluster analysis of 19 different forms for ktt three types of ktt strategies were identified they were significantly correlated mainly to i the absorptive capacity of a firm ii several factors hampering ktt activities and iii some characteristics of the transfer process such as the number of partners the existence of contacts to foreign universities and the utilization of the mediating services of transfer offices furthermore it was found that ktt strategies related to the core transfer activities such as r d contracts are stronger correlated with innovation performance compared to strategies related to softer transfer forms copyright 2009 the author 2009 published by oxford university press on behalf of associazione icc all rights reserved oxford university press

in defense of optimization the fallacy of 1 n previous research has shown that equally weighted portfolios outperform optimized portfolios which suggests that optimization adds no value in the absence of informed inputs this article argues the opposite with naive inputs optimized portfolios usually outperform equally weighted portfolios the ostensible superiority of the 1 n approach arises not from limitations in optimization but rather from reliance on rolling short term samples for estimating expected returns this approach often yields implausible expectations by relying on longer term samples for estimating expected returns or even naively contrived yet plausible assumptions optimized portfolios outperform equally weighted portfolios out of sample

are forest incomes sustainable firewood and timber extraction and productivity in community managed forests in nepal summary lack of combined forest productivity and income studies means there is scant evidence for the sustainability of rural household level forest incomes in developing countries this study examines levels and patterns of forest increment wood product extraction and household level incomes in three community managed forests in nepal using data from 240 permanent sample plots and a structured household survey conducted in 2006 and 2009 n 507 and 558 respectively we find that analyses of sustainability need to recognize the complexity of forest stand utilization and that there is considerable scope by altering how existing local forest management rules are implemented for increasing rural household forest incomes while keeping harvesting levels sustainable

economic growth and the rise of forests although forests have diminished globally over the past 400 years forest cover has increased in some areas including india in the last two decades aggregate time series evidence on forest growth rates and income growth across countries and within india and a newly assembled data set that combines national household survey data census data and satellite images of land use in rural india at the village level over a 29 year period are used to explore the hypothesis that increases in the demand for forest products associated with income and population growth lead to forest growth the evidence is consistent with this hypothesis which also shows that neither the expansion of agricultural productivity nor rising wages in india increased local forest cover

application of an almost ideal demand system aids to ethiopian rural residential energy use panel data evidence abstract it is well known that poor rural households in low income economies are reliant on traditional fuels to meet basic domestic energy needs but little is known about the specific underlying socio economic drivers of residential fuel choices in ethiopia i used the linear approximation almost ideal demand system laaids with normalized prices to compute expenditure elasticity and a multinomial logit model mlm to examine household fuel use the laaids model result showed that expenditure was elastic for modern fuels but inelastic for traditional fuels regression results from the mlm indicated that fuel choice behaviour of rural households could be more accurately described as fuel stacking behaviour as opposed to the energy ladder hypothesis in rural areas household fuel choice may be constrained by limited access to commercial fuels and efficient cook stoves supply dependency and affordability consumer preferences and a web of other intricate factors rural households had less incentive for fuel switching due to underlying factors and the availability of fuel wood without direct financial cost with continued deforestation and receding forests households are expected to develop inter fuel substitution and switching behaviour conditional on access to modern energy technologies

shadow wages and peasant family labour supply an econometric application to the peruvian sierra a striking feature of developing economies is the large proportion of the work force that is self employed lack of widespread labor market participation in the agricultural sector can pose a major obstacle to the empirical implementation of economic models of the peasant household whether because wage data are simply not available or because the assumptions required to make use of wage data stretch the bounds of credulity this paper develops a methodology for estimating a structural labor supply model for primarily self employed peasant households which holds under a general agricultural technology and set of labor market conditions the unique feature of the approach is that the opportunity cost of time or shadow wage of household workers is explicitly estimated from an agricultural production function and is subsequently used to identify a set of structural labor supply parameters recent household survey data from rural peru is employed to estimate and perform various diagnostic tests on the model the empirical findings lend support to the hypothesis that peasant households allocate their members time as if to maximize a family utility function and moreover demonstrate the tractability of the shadow wage methodology and its usefulness in estimating more elaborate time allocation models

modeling the choice to switch from fuelwood to electricity implications for giant panda habitat conservation despite its status as a nature reserve wolong nature reserve china has experienced continued loss of giant panda habitat due to human activities such as fuelwood collection electricity though available throughout wolong has not replaced fuelwood as an energy source we used stated preference data obtained from in person interviews to estimate a random utility model of the choice of adopting electricity for cooking and heating willingness to switch to electricity was explained by demographic and electricity factors price voltage and outage frequency in addition to price nonprice factors such as voltage and outage frequency significantly affect the demand thus lowering electricity prices and increasing electricity quality would encourage local residents to switch from fuelwood to electricity and should be considered in the mix of policies to promote conservation of panda habitat 2002 elsevier science b v all rights reserved

optimal portfolios in good times and bad recent experience with emerging market investments and hedge funds has highlighted the fact that risk parameters are unstable to address this problem we introduce a procedure for identifying multivariate outliers and use the outliers to estimate a new covariance matrix we suggest that a covariance matrix estimated from outliers characterizes a portfolio s riskiness during market turbulence better than a full sample covariance matrix we also introduce a procedure for blending an inside sample covariance matrix with one from an outlier sample this procedure enables one to express views about the likelihood of each risk regime and to differentiate one s aversion to them our framework collapses to the markowitz mean variance model if 1 we set the probabilities of the inside and outlying covariance matrixes equal to their empirical frequencies 2 we are equally averse to both risk regimes and 3 we estimate the inside and outlying covariances around the full sample s mean

household energy choices and fuelwood consumption an econometric approach using french data this study proposes an econometric analysis of household fuelwood demand in france the choice concerning the energy used for heating is modeled stressing the combination between one type of energy used as a main source and another one used as a back up this endogenous decision has an impact on fuelwood consumption and is taken into account to avoid biased estimates of price and income elasticities the results show that the choice of energy mix is determined by the income and the socio economic characteristics of households and that fuelwood consumption is price sensitive in the case where wood is the main source of energy

food versus fuel examining tradeoffs in the allocation of biomass energy sources to domestic and productive uses in ethiopia rural households in ethiopia have limited options to meet their domestic energy needs because they lack access to modern fuels and technologies domestic use of certain fuel sources such as cow dung can hinder agricultural outcomes and productivity this article explores the tradeoffs between domestic and productive uses of biomass energy sources in the nile basin of ethiopia using a nonseparable farm household model where labor allocation to energy collection and farming are analyzed simultaneously we estimate a system of five structural equations using three stage least squares and find that the use of dung as a domestic fuel source has negative implications for the value of harvested crops while use of on farm fuelwood is associated with increased value of agricultural output on farm production of fuelwood appears to increase the value of crop output and provide labor savings by making fuelwood collection more convenient for households policy interventions to support the expansion of agroforestry and increase access to new energy efficient technologies are needed to ensure that agricultural productivity can be both increased and sustained

an energy pricing scheme for the diffusion of decentralized renewable technology investment in developing countries the purpose of this paper is to investigate price support for market penetration of renewable energy in developing nations through a decentralized supply process we integrate the new decentralized energy support renewable premium tariff to analyze impacts of tariff incentives on the diffusion of renewable technology in senegal based on photovoltaic and wind technologies and an assessment of renewable energy resources in senegal an optimization technique is combined with a cash flow analysis to investigate investment decisions in renewable energy sector our findings indicate that this support mechanism could strengthen the sustainable deployment of renewable energy in remote areas of senegal although different payoffs emerged profits associated with a renewable premium tariff are the highest among the set of existing payoffs moreover in analyzing impacts of price incentives on social welfare we show that price tariffing schemes must be strategically scrutinized in order to minimize welfare loss associated with price incentives finally we argue that a sustainable promotion of incentive mechanisms supporting deployment of renewable technology in developing nations should be carried out under reliable institutional structures the additional advantage of the proposed methodology is its ability to integrate different stakeholders producers investors and consumers in the planning process

rural household energy use and its determinants in china how important are influences of payment for ecosystem services vs other factors abstract fuelwood is an essential environmental good for livelihood in rural china heavy reliance on fuelwood is associated with numerous negative externalities due to decades of rapid economic growth in china we hypothesize that the increase in rural household income would reduce reliance on fuelwood using data from a survey of 481 households conducted in 2014 we examined the effects of two payments for ecosystem services programs the conversion of cropland to forest program ccfp and the ecological welfare forest program ewfp on energy use along with other factors we found that the ccfp did not significantly affect fuel choice nor the quantity of fuelwood used but households with more forestland in ewfp were less likely to adopt modern fuels and likely to use more fuelwood household per capita annual income was the main factor promoting adoption of modern fuels while household size was the most important factor determining the quantity of fuelwood used per capita overall the gradually increasing adoption of modern fuels has thus far not resulted in any significant abandonment of fuelwood fuelwood remains the dominant fuel across all income groups suggesting that households in the study area are in the early stages of the energy transition

factors determining household use of clean and renewable energy sources for lighting in sub saharan africa abstract the purpose of the current research is to examine the factors that influence household use of determinants of renewable and clean energy sources used for lighting purposes in africa using the data from the living standard measurement study lsms from three african countries ethiopia tanzania and malawi for this purpose the paper uses multinomial logit and ordered probit econometrics models the descriptive analysis reveals that rural households are dependent largely on kerosene and batteries for lighting their houses while electricity and batteries form a major source of energy for lighting urban households a small fraction of households uses solid fuels and solar as their source of energy for lighting econometric results show that female headed households are likely to adopt clean and renewable sources of energy compared to male headed households wealthier and more educated households are found to use electricity and solar energy for lighting while poorer households tend to use kerosene batteries and solid fuels empirical results indicated that the ethiopian households followed by malawian households are more likely to use clean sources of energy compared to tanzanian households

asset allocation with correlation a composite trade off abstract we assess the ability of minimum variance portfolio allocation strategies accounting for time varying correlation between assets to provide performance benefits relative to an equally weighted portfolio prior to transaction costs correlation based strategies emphatically outperform the equally weighted benchmark this finding is strongest for short horizon correlation forecasts and attributed to dynamic correlation as opposed to variance forecasts thus estimation error is not found to be the primary obstacle to successful portfolio optimization rather frequent rebalancing and associated transaction costs pose a significant challenge limiting portfolio turnover through short selling restrictions and greater rebalancing error tolerance results in regular outperformance of the correlation based strategies even for large transaction costs taken together these findings provide evidence of a trade off between optimal portfolio performance forecasting horizon rebalancing frequency and transaction costs