material flows vs natural capital what makes an economy sustainable abstract in the discourse about sustainable development constant natural capital is frequently referred to as a criterion for ecological sustainability but what is natural capital the concept will be analyzed by presenting arguments in favour of using the term and different versions of sustainability strong and weak subsequently a critique of the natural capital concept is brought forward from an ecological as well as from an economic perspective following this critique the use of material inputs and the material input per unit of service mips as a measure for the environmental impact potential is suggested dematerialisation is understood to be an alternative management rule for sustainability in conclusion a change of perspective is proposed due to the conceptual and measurement problems associated with the constant natural capital criterion which refers to a stock it seems more reasonable from a scientific as well as from a practical perspective to add flows i e material inputs to a decision criterion for whether a development is sustainable or not

handling unobserved site characteristics in random utility models of recreation demand abstract this paper presents a new random utility model of recreation demand that addresses the unobserved characteristics of recreation sites most random utility recreation demand models implicitly assume that all relevant site characteristics are observed by the researcher or allow for the possibility of unobserved characteristics in a restrictive manner unlike traditional approaches the proposed model avoids the bias unobserved site characteristics can cause in welfare estimates and the travel cost parameter monte carlo simulations motivate the proposed model by showing that it provides more efficient parameter estimates in contrast existing methods yield less efficient estimates and biased standard errors that overstate precision an empirical application to recreational fishing in wisconsin illustrates the potential importance of this modeling innovation in this application controlling for unobserved characteristics is important for a range of model specifications

meta analysis in model implementation choice sets and the valuation of air quality improvements this research illustrates how the methods developed for meta analysis can serve to document and summarize voluminous information derived from repeated sensitivity analyses our application is to the sensitivity of welfare estimates derived from discrete choice models to assumptions about the choice set these assumptions affect welfare estimates through both the estimated parameters of the model and conditional on the parameters the substitution among alternatives in our specific application the evaluation is in terms of estimated benefits of air quality improvements in los angeles based on discrete choices of neighborhood and housing copyright 2007 john wiley sons ltd

a utility consistent combined discrete choice and count data model assessing recreational use losses due to natural resource damage abstract a two stage budgeting approach can often be taken when analyzing consumer choice situations in this paper we examine the particular situation where a consumer makes purchases of a discrete commodity of which there are a number of brands in the first stage the consumer decides how many purchases to make in the second stage the consumer decides how to allocate these purchases across brands our econometric approach to this type of situation uses a utility consistent combined discrete choice and count data model the second stage which is specified as a multinomial choice model produces a price index for the commodity which is used to estimate the first stage which is specified as a count data model we apply the model to recreational demand behavior in alaska in order to estimate the welfare losses suffered by recreational users due to the exxon valdez oil spill these results may provide useful input to government agencies attempting to estimate the appropriate level of taxes fines or regulations for deterring damage to the environment

spatial boundaries and choice set definition in a random utility model of recreation demand we are concerned with the definition of choice set used in random utility models of recreation demand in particular we are concerned with the spatial boundaries used to define choice sets in this paper using a model of day trip fishing in maine we examine the sensitivity of parameter and welfare estimates to changes in the spatial boundary we find that there exists some threshold distance beyond which adding more sites to the choice set has negligible effects on the estimation results

revealing preferences for leisure time from stated preference data when consumer choice is constrained by time as well as money willingness to pay can be defined with respect to either numeraire the two measures can be related formally within a utility consistent model of choice subject to two constraints furthermore when information is collected on both the respondent s marginal value of time can be identified a system of willingness to pay time and money and the marginal value of leisure time is estimated jointly in an application to california whalewatching and whale stock enhancement the empirical approach can be applied with only minor additions to survey techniques for nonmarket valuation

a repeated nested logit model of atlantic salmon fishing participation and site choice for atlantic salmon fishing are modeled in the context of a repeated three level nested logit model consumer s surplus measures are derived for different levels of species availability in the penobscot river the most important salmon river in new england for comparison six other travel cost models are estimated these include restrictive cases of the nested logit model a partial demand model and two single site demand models comparisons across these models indicate the importance of modeling the participation decision including income effects and of adopting a nested logit structure rather than a single level logit structure

estimating the cost of leisure time for recreation demand models abstract in this paper we propose a method of determining the opportunity cost of leisure time with an empirical recreation demand application typically the opportunity cost of leisure time is assumed to be some fraction of the wage rate this practice has limitations first it assumes that individuals can trade time for money at their wage second it offers no guidance about how to value the time of an individual who is not in the labor force this paper proposes a method of determining this cost that does not suffer from these drawbacks an empirical example is provided which demonstrates the proposed approach and contrasts it with commonly applied approaches

the individual travel cost method with consumer specific values of travel time savings the treatment of the opportunity cost of travel time in travel cost models has been an area of research interest for many decades our analysis develops a methodology to combine the travel distance and travel time data with respondent specific estimates of the value of travel time savings vtts the individual vtts are elicited with the use of discrete choice stated preference methods the travel time valuation procedure is integrated into the travel cost valuation exercise to create a two equation structural model of site valuation since the travel time equation of the structural model incorporates individual preference heterogeneity the full structure model provides a travel cost site demand model based upon individualized values of time the methodology is illustrated in a study of recreational birdwatching more specifically visits to a stork village in poland we show that the usual practice of basing respondents vtts on 1 3 of their wage rate is largely unfounded and propose alternatives including a separate component of the travel cost survey aimed at valuation of respondents vtts or as a second best asking if they wish if their journey was shorter and for those who do use full hourly wage as an indicator of their vtts

estimation of distance decay functions to account for substitution and spatial heterogeneity in stated preference research in a site selection choice experiment various hypotheses are tested related to spatial heterogeneity in willingness to pay wtp for environmental improvements spatial heterogeneity is measured through distance decay effects substitute sites inside and outside the experiment s choice set and spatial trend variables we demonstrate that distance decay functions differ between users and nonusers and across study sites also the distance to substitutes outside the choice set explains spatial variation in wtp we show that further extending the model with spatial trend variables reveals additional spatial heterogeneity in choices accounting for spatial heterogeneity patterns results in significantly different wtp estimates for environmental improvements jel q25 q51

optimized quantity within distance models of spatial welfare heterogeneity abstract spatial welfare heterogeneity is frequently modeled within stated preference analysis as a function of discrete or continuous distance between households and affected resources a common example is distance decay analysis although distance based models such as these are easily estimated the ubiquity of this paradigm can lead to analyses that overlook other forms of analysis with equal or greater relevance this paper develops an alternative approach to spatial heterogeneity in stated preference willingness to pay wtp based on the quantity or area of an affected resource surrounding each respondent at an optimized distance band or radius with distance bands optimized using a grid search algorithm that maximizes model likelihood methods and results are illustrated using a choice experiment on riparian land restoration in maine usa the resulting quantity within distance model identifies systematic spatial patterns that are undetectable using distance based analysis and directly relevant for welfare analysis

the distributional impacts of recreational fees a discrete choice model with incomplete data in this manuscript we explore the consequences to different income groups of various policies to reduce overfishing in the gulf marine recreational fishery to do so we estimate a discrete choice model of marine recreational fishing demand allowing for incomplete data and a non constant marginal utility of income by allowing the marginal utility of income to vary across three categorical income groups our model allows us to explore the distributional consequences of various fee schemes and other policy programs that would change catch in the fishery we find that flat fees have a strong proportional effect on the participation of shore fishermen where low income anglers predominate and a relatively small impact on the expensive charter fishing mode we also find that the welfare consequences of declining catch rates would fall disproportionately on low income anglers jel q51 q22

the opportunity cost of travel time in recreation demand models deciding how to allocate forage among animals is a fundamentally important process in range management the wisdom of these decisions can be enhanced by estimating the marginal value of forage needed by competing species we present a method for

materials product chains theory and an application to zinc and pvc gutters a framework is presented for the analysis of economic and environmental impacts of policies applied to materials product mp chains this is based on materials flows product flows costs prices and optimal management of an mp chain the main differences compared with other studies focusing on materials flows is that here the link between products or services and materials is explicitly dealt with the framework is developed on the basis of materials balance conditions production functions allowing for substitution and recycling of both materials and products after presenting theoretical mp chain models and analytical results an application to the problem of choosing between zinc and pvc gutters is discussed here optimal mp chain management decisions are presented for various policy and strategy scenarios

the relationship between hours of work and labor force participation in four models of labor supply behavior this article analyzes the relationship between hours of work and labor force participation lfp in heckman s model cogan s fixed cost model moffitt s minimum hours constraint model and a generalized version of heckman s model first the parameter restrictions between the lfp and reduced form hours of work equations are compared the models are then estimated and the results support the weakening of the link between the lfp and hours of work decisions one implication of the analysis is that heckman s model overstates the standard labor supply elasticities because it confounds the direct effect on labor supply with the participation effect

an empirical analysis of dematerialisation application to metal policies in the netherlands abstract this paper presents a first empirical step in filling the gap between physical and economic models by combining a material flow model and an applied general equilibrium age model the goal of this paper is threefold firstly a new methodology is discussed for the integration of material and economic flow models secondly the new methodology is tested for its empirical applicability by simulation of material policies finally the analysis leads to the identification of major steps for filling the existing gap between physical and economic models further fiscal material policies are imposed to reduce the use of specific materials the material levy and the accompanying labour tax reduction shift the tax burden from labour to the use of materials the empirical illustration shows that the physical and economic flows can be made mutually compatible and that the combined model can be used for empirical analysis of material policies from this analysis of material policies in an economic model it may be concluded that the combination of an age model and a material flow model may produce an appropriate tool for analysing environmental sectoral and distributional effects of dematerialisation policies

developments in the throughput income relationship theoretical and empirical observations abstract it has been suggested that the relationship between income and the associated environmental pressure in terms of derived materials inputs and pollution levels may take an inverted u shape indicating a delinking of environmental pressure from economic growth in relation to rising per capita incomes the likelihood of such a relationship being persistent is discussed in the context of a simple macro model of industrial metabolism and the possibility of relinking clearly emerges data on specific indicators of environmental pressure i e the throughput of materials energy and the volume of transport in 19 countries have been used to investigate patterns of delinking the results suggest that delinking may not be persistent already some advanced economies may be entering a new period of relinking the relationships between environmental pressure and welfare in the medium long term may be n shaped rather than inverted u shaped

social capital geography and survival gujarati immigrant entrepreneurs in the u s lodging industry immigrant entrepreneurs often rely on their groups local social capital in their new home market to establish and maintain their businesses in particular immigrant entrepreneurs with few resources of their own receive help from those possessing more resources supporting these arguments using the empirical setting of gujarati immigrant entrepreneurs in the lodging industry we find that the likelihood of survival of an immigrant entrepreneurs hotel increases when surrounded by higher counts of branded hotels representing high resource establishments owned by individuals from their ethnic group but is unaffected by unbranded motels representing low resource establishments owned by members of their ethnic group or by branded hotels owned by individuals from other ethnic groups these results isolate and reinforce the importance of social capital not only for immigrant entrepreneurs but also more generally for any entrepreneurs belonging to ethnic professional religious or social groups

interactions between investment timing and management effort under asymmetric information costs and benefits of privatized firms abstract in this paper we examine the interactions between investment timing and management effort in the presence of asymmetric information between the owner and the manager where the manager has an informational advantage we find that investment timing is later under asymmetric information than under full information implying a decrease in the value of equity option however in order to minimize any distortion under underinvestment management effort is greater under asymmetric information than under full information we show that there are trade offs in the efficiencies of investment timing and management effort under asymmetric information these results fit well with the findings of past empirical studies concerning the costs and benefits of privatized firms

the impact of voluntary disclosure on a firm s investment policy in this paper we provide a model which describes how voluntary disclosure impacts on the timing of a firm s investment decisions a manager chooses a time to invest in a project and a time to disclose the investment return in order to maximise his monetary payoff we assume that this payoff is linked to the level of the firm s stock price prior to investing the profitability of the project and the market reaction to the disclosure of the investment return are uncertain but the manager receives signals at random points in time which assist in resolving some of this uncertainty we find that a manager whose objective can only be achieved through voluntarily disclosing the return is motivated to invest at a time that would be sub optimal for an identical manager with a profit maximising objective

decoupling waste generation from economic growth a cge analysis of the swedish case abstract over the past decades we have seen the quantities of solid waste increase in close relation to economic growth to tackle this problem of continuing waste growth the eu has on its agenda that waste generation should decouple from economic growth within the eu in the future sweden also has stated a target of non increasing future waste quantities the strength of the policy measures needed to attain this target is here illustrated by comparing the waste intensity outcomes in a decoupling scenario and a baseline scenario of the swedish economy 2006 2030 a computable general equilibrium cge model is used for linking waste generation to firms material input firms production and households consumption when projecting future quantities of hazardous and non hazardous waste in sweden we show that to offset the effect of economic growth on waste generation in the decoupling scenario the intensities of material related wastes must decrease at a yearly rate that is about twice the historically estimated reduction rate used in the baseline scenario the reduction in the intensities of waste related to firms production and households consumption must also be substantial compared to historical estimates

modelling the effect of chronic wasting disease on recreational hunting site choice preferences and choice set formation over time chronic wasting disease cwd is a prion disease that affects deer elk and other cervid wildlife species although there is no known link between the consumption of cwd affected meat and human health hunters are advised to have animals from cwd affected areas tested and are advised against consuming meat from cwd infected animals government of alberta 2010 we model hunter response to the knowledge that deer in a wildlife management unit have been found to have cwd in alberta canada we examine hunter site choice over two hunting seasons using revealed and stated preference data in models that incorporate preferences choice set formation and scale we compare a fully endogenous choice set model using the independent availability logit model swait in probabilistic choice set formation in transportation demand models dissertation mit 1984 with the availability function approach cascetta and papola in transp res c 9 4 249 263 2001 that approximates choice set formation we find that cwd incidence affects choice set formation and preferences and that ignoring choice set formation would result in biased estimates of impact and welfare measures this study contributes to the broader recreation demand literature by incorporating choice set formation scale and temporal impacts into a random utility model of recreation demand

choice set formation for outdoor destinations the role of motivations and preference discrimination in site selection for the management of public expenditures on protected areas effective public expenditure currently dominates the management focus of many protected areas this calls for explicit modeling of constraints and motivations that respectively obstruct and stimulate visits to selected outdoor destinations choice set formation is the result of screening and or inclusion of specific sites alternatives to form the set of sites considered in real choices evidence shows that the omission of a structural representation of choice set formation is harmful to econometric inference yet the literature has largely ignored the underlying behavioral phenomenon we show using a discrete choice experiment involving selection among seven recreational sites in an italian national park that choice set formation is behaviorally relevant even after controlling for preference discrimination motivations why visit are important determinants of preliminary site screening for choice set inclusion as well as site selection justifying the additional value of such modeling extension

the recreational value of lake mckenzie fraser island an application of the travel cost method lake mckenzie is one of the most highly used and popular visitor destinations of all fraser island s natural sites attracting 2000 visitors a day in peak periods many consider this level of visitation to be unsustainable and the management authority is currently considering a range of management options to address this issue in assessing the alternatives it is useful to have some idea of the recreational use value of the lake under the current regime as it is this value that is at risk if visitor numbers are to be reduced this paper using the zonal travel cost method estimates the recreational use value of fraser island and lake mckenzie for australian resident independent visitors

the opportunity cost of travel time as a noisy wage fraction few issues are more important to welfare estimation with recreation demand models than the specification of the opportunity cost of travel time the two most common approaches to specifying this cost treat it as a fixed fraction of the recreationist s wage and either estimate the fraction done infrequently or assume it takes some value done commonly with references to results from the commute time literature used to justify the latter however these approaches lack firm conceptual rationales and the consequences of using them are not fully understood recognizing that information limitations often preclude more general approaches we use a joint recreation travel labor supply model to show that under relatively modest assumptions the opportunity cost of travel time can be expressed as a wage fraction with noise this formulation is straightforward to implement as part of random parameters based recreation demand models we then evaluate the welfare consequences of using the two approaches noted above which are special cases of the noisy wage fraction specification our results suggest that the more critical restriction to relax in opportunity cost of travel time specifications is the absence of noise rather than the specific level of the wage fraction

an efficiency approach to choice set formation theory and application to recreational destination choice an unresolved debate in behavioural choice research surrounds specifying individual choice sets to overcome the limitations of deterministic and probabilistic approaches in a framework consistent with individual optimizing behaviour this study develops an efficient frontiers approach to the choice set problem in the context of revealed preference destination choice stochastic frontier models relating costly inputs to utility generating outputs are estimated to measure the efficiency of sites choice sets are then formed by retaining sites that exceed alternative efficiency thresholds choice set composition site choice efficiency and probability of selection and consumer surplus are evaluated in the case of fishery site choice in maine

the effect of nesting structure specification on welfare estimation in a random utility model of recreation demand an application to the demand for recreational fishing nested logit has become common in estimating random utility models of recreation demand because welfare analysis is often the objective of estimating these models it seems natural to ask what effect does the choice of nesting structure have on the welfare estimates generated by these models therefore we compare the results of nine nesting structures andfindthat the variation in welfare estimates across the models is not large our results are contrary to those of kling and thomson and shaw and ozog the difference appears to originate with differences in the estimated dissimilarity coefficients in the nested models

the implications of model specification for welfare estimation in nested logit models nested logit models are increasingly being used to value environmental amenities the implications of nesting structure choice of estimator fiml or sequential and restrictions on parameters across nested groups on welfare estimates are examined these issues have received little previous attention model selection criteria that can be used to distinguish among the models are extended and applied additionally a simulation procedure is implemented to construct standard errors for the welfare measures

combining revealed and stated preference data to estimate the nonmarket value of ecological services an assessment of the state of the science this paper reviews the marketing transportation and environmental economics literature on the joint estimation of revealed preference rp and stated preference sp data the rp and sp approaches are first described with a focus on the strengths and weaknesses of each recognizing these strengths and weaknesses the potential gains from combining data are described a classification system for combined data that emphasizes the type of data combination and the econometric models used is proposed a methodological review of the literature is pursued based on this classification system examples from the environmental economics literature are highlighted a discussion of the advantages and disadvantages of each type of jointly estimated model is then presented suggestions for future research in particular opportunities for application of these models to environmental quality valuation are presented

improving new technology venture performance under direct and indirect network externality conditions this study compares the effectiveness of five responses to external uncertainty in markets with network externalities avoidance imitation control cooperation and real options reasoning as a form of strategic flexibility our analysis of 385 new technology ventures shows that direct and indirect network externalities have opposite effects on the effectiveness of these strategies moreover under network externalities attempts to make ventures less dependent upon environmental instabilities perform differently compared to attempts to control the environment finally we show that real options reasoning does not always perform better under conditions of higher uncertainty such as uncertainty due to direct network externalities

structural models of family labor supply a discrete choice approach a static neoclassical structural model is presented explaining labor supply of both spouses in two adult households in the netherlands family preferences are described with a direct translog utility function with the husbands leisure the wifes leisure and family income as its arguments we assume that the choice set of each family is finite account is taken of the dutch tax and benefits system we allow for hours restrictions and random preferences and account for unobserved wages of nonworkers the models are estimated using smooth simulated maximum likelihood results based upon dutch cross section data from 1987 are illustrated by confidence intervals for elasticities and by several policy simulations excerpt

the effect of consumers real world choice sets on inferences from stated preference surveys for stated preference sp studies we develop a model that assesses the influence of choice set misspecification arising from the omission of perceived substitutes among real world alternatives in the same class of goods this problem is most likely to be present when individuals are allowed to select a no purchase option instead of being forced to choose from an explicit set of sp alternatives with hypothetical attribute levels a convenient feature of our model is that researchers do not need to know exactly which omitted real substitute the individual most prefers only the set of real substitutes that exists in our empirical illustration a comparison of rival models suggests researchers who overlook the presence of perceived real alternatives related to an sp experiment can end up with noticeably biased welfare estimates our more general model suggests that it may be prudent for future sp researchers to anticipate then test and possibly correct for distortions in utility parameter estimates that result from this problem

earnouts in mergers and acquisitions a game theoretic option pricing approach abstract this paper presents a valuation approach for merger and acquisition m a deals employing contingent earnouts it is argued that these transactions have option like features and the paper uses a game theoretic option approach to model the value of such claims more specifically the paper examines the impact of uncertainty on the optimal timing of m a using earnouts and it also investigates the impact of uncertainty on the terms of the earnout optimal earnout and initial payment combinations are endogenously derived from the model and testable hypotheses are developed the theoretical contribution of this paper is a dynamic decision making model of the invest to learn option generated upon investment in an acquisition the paper also offers practical implications for the design of acquisitions employing earnouts

real options and preemption under incomplete information abstract this paper introduces incomplete information and preemption into an equilibrium model of firms facing real investment decisions the optimal investment strategy may lie anywhere between the zero npv trigger level and the optimal strategy of a monopolist depending on the distribution of competitors costs and the implied fear of preemption our model implies that the equity returns of firms which hold real options and are subject to preemption will contain jumps and positive skewness

accounting for stochastic shadow values of time in discrete choice recreation demand models abstract in this paper a discrete choice recreation demand model that explicitly accounts for a stochastic shadow value of time function is proposed using data from a survey of san diego beach users the stochastic shadow value of time labor supply and beach choice are jointly estimated results from this joint estimation approach are compared with the familiar two step approach that estimates labor supply first and uses predicted values of time in the recreational site choice model the approaches produce markedly different welfare measures with the two step model which does not account for unobserved variability of time values predicting significantly higher values a monte carlo simulation illustrates how ignoring the stochastic nature of shadow value of time in discrete choice recreation demand models can bias model parameters and hence welfare estimates

time and the recreational demand model in this paper a theoretically consistent approach to including time costs in recreational demand models is developed the demand model is conditional on the recreationist s labor market situation for individuals at corner solutions in the labor market utility maximization is subject to two constraints leading to a demand function with travel costs and travel time as independent variables with interior solutions in the labor market time is valued at the wage rate and combined with travel costs to produce one full cost variable in an illustration welfare measures based on the new model are estimated for a sample of sportfishermen

the economics of fish consumption advisories insights from revealed and stated preference data measuring how fish consumption advisories affect angler s utility has proven difficult relying on stated preference sp data is problematic because of hypothetical bias revealed preference rp data benefits from using actual behavior however co linearity often makes it difficult to model the array of advisory severity levels across different species and catch rates the array of advisories also makes traditional joint estimation impractical this paper describes an alternative joint estimation technique based on an index of sp parameter that we used for estimating the effect of fish consumption advisories on the fox river green bay

willingness to pay and willingness to accept how much can they differ comment i agree with the point made by edoh y amiran and daniel a hagen 2003 that there can be a substantial or even infinite divergence between the wta and wtp for a public good even where there is a nonzero elasticity of substitution between market goods and the public good provided that the indifference curves are asymptotically bounded with respect to market goods in the manner they describe this is an important point they are also correct to point out that the elasticity of substitution is a local concept whereas their asymptotic boundedness condition applies also for discrete changes my 1991 paper used a local analysis because it was following the structure of the analysis in robert d willig 1976 and alan randall and john r stoll 1980 i wanted to show that while randall and stoll appeared to extend willig s local result on wta versus wtp from price changes to changes in the quantity of a public good the relevant elasticity was in fact different and involved the substitution elasticity as well as the income elasticity i view these points by amiran and hagen as not two separate results but essentially the same result their asymptotic boundedness condition generalizes my zero elasticity of substitution condition to discrete changes the asymptotic boundedness condition can be expressed as follows assuming a bivariate utility function u x q and given a reference point x q associated with a reference utility level u u x q there exists some q q such that for all q q there exists no x such that u x q u in other words no amount of x can substitute for the reduction in public good from q to q q in the case of a zero elasticity of substitution q q but as amiran and hagen show in their theorem 1 this is unnecessarily restrictive when dealing with a discrete reduction in q furthermore their theorem 2 can be viewed as a special case of their theorem 1 in which q 0 which makes q an essential commodity it is well known in consumer theory that the wta to avoid the loss of an essential market good is infinite their theorem 2 extends this result to the case of an essential nonmarket good but as their theorem 1 shows essentialness is not necessary for an infinite wta the boundedness condition is the key and this implies a fundamental lack of substitutability between money market goods and the public good

the impacts of uncertainties in a real options model under incomplete information abstract this paper examines the impact with respect to the uncertainty of the underlying state variable profit uncertainty on the real options model in a situation of incomplete information profit uncertainty has not incorporated into the real options model under incomplete information in that the underlying state variable is not formulated as the stochastic process see e g bernardo a e chowdhry e b 2002 resources real options and corporate strategy journal of financial economics 63 211 234 we extend the model developed by bernardo and chowdhry to formulate the underlying state variable as the stochastic process we conclude that profit uncertainty has the same type of impact on the real options value and its triggers both under complete and incomplete information

theory and estimation of the household production function for wildlife recreation abstract the household production function is an intuitively appealing way to model man s interaction with nature this paper models the interaction between the household s behavior and publicly provided inputs into wildlife recreation the paper shows how to compute benefits assuming that the household production function is known the household production function approach collapses to the simple travel cost approach when households are unable to substitute their own inputs for publicly provided inputs in addition the paper demonstrates the conditions under which the parameters of cost and preference functions can be identified the conditions for identification are quite restrictive when several choices are endogenous

accounting for choice set endogeneity in random utility models of recreation demand abstract modeling the choice among a discrete set of recreation alternatives is driven by the possible patterns of substitution among sites researchers typically assume that the individual s choice set is the same as the set of alternatives included in the recreation survey instrument our endogenous choice set model is a generalization of the standard multinomial logit random utility model which allows for the possibility of heterogeneous choice sets that are endogenously determined in the model using two examples we show that parameter and compensating variation estimates differ greatly between the endogenous choice set model and the traditional logit model

optimal portfolio choice under incomplete information models of asset pricing generally assume that the variables which characterize the state of the economy are observable however the distributional properties of asset prices that are relevant for portfolio decisions are in general not observable and therefore must be estimated the estimation of expected returns is a particularly difficult problem and estimation errors are likely to be substantial in this light it is reasonable to examine whether the assumption of observability of expected returns and other relevant state variables causes significant mis specification in equilibrium models of asset prices this paper has three main objectives first to derive optimal estimators for the unobservable expected instantaneous returns using observations of past realized returns second to establish that estimation and portfolio choice can be solved in two separate steps third to analyze the impact of estimation error on investment choices the estimators of expected returns are in general not consistent i e the estimation error does not tend to disappear asymptotically the effects of the estimation error therefore cannot be ignored even if realized returns are observed continuously over an infinite time period

a dual approach to modeling corner solutions in recreation demand abstract the dual approach of lee and pitt to estimating demand systems for which individuals often choose not to consume one or more of the available goods provides a utility consistent framework for estimating preferences over visits to recreation sites because of the complexity of the model however this approach has not been applied in the recreation demand literature this paper provides the first application of the model to recreation demand and develops a methodology for conducting welfare analysis relying on monte carlo integration to derive estimates of compensating variation the methods are applied to the demand for fishing in the wisconsin great lakes region

directional heterogeneity in wtp models for environmental valuation many studies in the stated preference literature on environmental valuation do not include the effects of substitutes and distance in willingness to pay wtp models in spite of the relevance of these effects in aggregation and benefit transfer heterogeneity in the availability of substitutes over space may cause multidirectional distance effects in wtp as a result disregarding this spatial heterogeneity may lead to biased estimators of the distance effect and associated wtp values cameron 2006 in this paper we demonstrate that distance decay is subject to significant directional effects which tend to be related to differences in the availability of substitutes across the study area we apply a straightforward methodology to account for such spatial heterogeneity in choice experiments and assess the effect on wtp for improvements in ecosystem services in a lake district we model distance decay effects whilst controlling for heterogeneity between users and non users and non use related wtp reasons the directional effects result in significantly different wtp estimates different market sizes reflecting the population with positive wtp and differences in total wtp up to 32

material accounting in a macroeconomic framework forecast of waste generated in manufacturing industries in norway this paper analyses the generation of waste inproduction processes using a technique based onthe physical law of conservation of mass according to this law mass going into aproduction process must equal the mass comingout of the same process the paper uses thismass balance perspective to refine a previouslydeveloped technique for forecasting wastequantities a macroeconomic model predicts theuse of intermediate inputs and production inmonetary units and by multiplying thesevariables with weight conversion factors weestimate physical amounts going into and out ofproduction the difference between input andoutput the residual consists of discharges toland water and air we predict a growth in theresiduals from manufacturing industries of 74 from 1993 to 2010 this growth is partly explained by an anticipated growth in material intensity

empirical specification requirements for two constraint models of recreation choice two constraint models are common in recreation demand analysis because of the important role time can play in consumer choices two versions of roy s identity hold for these models and imply coefficient restrictions on empirical demand functions the two constraint restrictions are fully observable and can be expressed in a form analogous to the slutsky hicks equations in single constraint consumer models empirical specifications that use full prices and full budgets can be consistent with the two constraint models when the marginal value of time is either exogenous or endogenous but models with full prices and money income alone are not copyright 2001 oxford university press

sampling and aggregation issues in random utility model estimation measurement of nonmarket values often involves subjective judgments since these judgments may influence results they should be carefully considered i focus on an aspect of subjective choice relating to the estimation of random utility models such models require specification of each recreationalist s choice set whether an individual perceives his choice set as composed of all possible alternatives a few popular alternatives or collections of spatially aggregated alternatives is an important judgment affecting the conclusions

measuring the cost of time in recreation demand analysis an application to sportfishing since the work of cesario and knetsch economists have recognized that the opportunity cost of time plays an important role in determining the demand for outdoor recreation the opportunities one has for spare time are more significant for consumption of time intensive outdoor recreation activities than for other commodities especially nondurables bishop and heberlein illustrate the overwhelming importance of time costs to final recreational values total consumer surplus is nearly four times as large when time costs are added at half the income rate as when time costs were set at zero p 21 despite the recognition economists have neither successfully integrated the costs of time with the methods of recreational demand analysis nor reached a consensus on how it should be measured brown charbonneau and hay state finally the apparently crucial importance of how opportunity cost of time is handled needs further work while we are convinced it is an appropriate concept exactly how it should be included and measured s remains to be determined p 24 several approaches have been taken to include it in the travel cost method one approach brown and nawas gum and martin suggests that time in transit be considered as a separate independent variable another approach bishop and heberlein brown charbonneau hay nicols bowes dwyer cesario and knetsch measures the cost of time and adds it to other costs several approaches have been suggested to measure time costs one approach is simply to choose an hourly wage e g 2 00 per hour or perhaps the minimum wage rate a more flexible but still ad hoc approach is to use some proportion of the individual s wage rate as the opportunity cost of time nichols bowes dwyer the proportion is usually taken from independent studies and used to value the travel time this approach is better than using a constant opportunity cost of time because it allows variation across individuals it suffers because the choice of the percentage of the wage rate is arbitrary independent of the sampled population cesario has discussed the consequences of ignoring time costs and the differences in values arising from alternative measurement approaches in this paper we argue that the opportunity cost of time is some proportion of the individual s market wage rate or income per hour and that this proportion can be determined from sample data this method permits the proportion to vary from one study to another rather than imposing either an arbitrary estimate or one from a sample different from the study s sample

the extent of information its relevance for random utility models this paper examines the effect of the researcher s definition of a recreator s choice set on the parameter and welfare estimates from standard random utility models three choice set definitions are compared choice sets based on all alternatives within the survey those alternatives within a specified distance from the respondents home and alternatives familiar to the individual we show that parameter and welfare estimates are sensitive to the definition of the choice set welfare measures of site closures differ in varying ways depending on the familiarity level of the sites in question

investment timing asymmetric information and audit structure a real options framework abstract this paper examines investment timing by the manager in a decentralized firm in the presence of asymmetric information in particular we incorporate an audit technology in the agency model developed by grenadier and wang 2005 investment timing agency and information journal of financial economics 75 493 533 the implied investment trigger in the agency problem with auditing is larger than in the full information problem and smaller than in the agency problem without auditing nevertheless the audit technology does not necessarily reduce inefficiency in the total social welfare

the mne as a portfolio interdependencies in mne growth trajectory we conceptualize the mne as a portfolio of interdependent sub units and examine its growth trajectory in relation to its existing portfolio the empirical testing is based on a unique dataset that details all the location moves of us legal services mnes during 1949 2006 these mnes evolve in directions that follow from their past their portfolios affect their subsequent moves speaking for the impact of interdependencies among sub units on the evolution of mnes the portfolio exercises stronger impact on entry than on exit suggesting that different forces affect mnes expansion and contraction we outline strategic and organizational implications of the conceptualization of the mne as a portfolio