sulfur dioxide control by electric utilities what are the gains from trade title iv of the 1990 clean air act amendments caaa established a market for transferable sulfur dioxide so2 emission allowances among electric utilities this market offers firms facing high marginal abatement costs the opportunity to purchase the right to emit so2 from firms with lower costs and this is expected to yield cost savings compared to a command and control approach to environmental regulation this paper uses econometrically estimated marginal abatement cost functions for power plants affected by title iv of the caaa to evaluate the performance of the so2 allowance market specifically we investigate whether the much heralded fall in the cost of abating so2 compared to original estimates can be attributed to allowance trading we demonstrate that for plants that use low sulfur coal to reduce so2 emissions technical change and the fall in prices of low sulfur coal have lowered marginal abatement cost curves by over 50 percent since 1985 the flexibility to take advantage of these chan

recent advances in the valuation of ecosystem services and biodiversity recent interest in the economics of biodiversity and wider ecosystem services has been given empirical expression through a focus upon economic valuation this emphasis has been prompted by a growing recognition that the benefits and opportunity costs associated with such services are frequently given cursory consideration in policy analyses or even completely ignored the valuation of biodiversity and ecosystem services is therefore increasingly seen as a crucial element of robust decision making and this has been reflected in a growing body of related research we provide a critical review of some of this research considering the valuation methods applied to date and focussing upon their limitations in respect to certain categories of ecosystem services particularly cultural services and the applicability of the extant literature to new settings substantial questions also remain at the interface of natural science and economics and we consider the potential contribution of the conceptualization of ecosystems as assets as a response to this challenge as part of this review we also highlight the role which large scale ecosystem assessments have played as an impetus to extending the valuation evidence base and the way in which frameworks and assessments of how ecosystems contribute to human wellbeing might be translated into policy thinking and decision analyses

protecting forests biodiversity and the climate predicting policy impact to improve policy choice p olicies must balance forest conservation s local costs with its benefits local to global in terms of biodiversity the mitigation of climate change and other eco services such as water quality the trade offs with development vary across forest locations we argue that considering location in three ways helps to predict policy impact and improve policy choice i policy impacts vary by location because baseline deforestation varies with characteristics market distances slopes soils etc of loca tions in a landscape ii different mixes of political economic pressures drive the location of different policies and iii policies can trigger second order or spillover effects likely to differ by location we provide empirical evidence that suggests the importance of all three considerations by reviewing high quality evaluations of the impact of conservation and development on forest impacts of well enforced conservation rise with private clearing pressure supporting i protection types e g federal state dif fer in locations and thus in impacts supporting ii differences in development process explain differ ent signs for spillovers supporting iii

liquidity flows and fragility of business enterprises abstract this paper develops a macroeconomic model in which funds are channeled to entrepreneurs through long term relationships between entrepreneurs and lenders the flow of funds to a relationship may be low causing it to break up due to insufficient liquidity multiple pareto ranked steady states emerge from complementarity between financial intermediation reflected by the number of relationships and households incentives to provide funds this complementarity also serves as a mechanism for propagating aggregate shocks financial collapse may become inescapable if a shock destroys sufficiently many relationships

job destruction and propagation of shocks this paper considers propagation of aggregate shocks in a dynamic general equilibrium model with labor market matching and endogenous job destruction cyclical fluctuations in the job destruction rate magnify the output effects of shocks as well as making them much more persistent interactions between capital adjustment and the job destruction rate play an important role in generating persistence propagation effects are shown to be quantitatively substantial when the model is calibrated using job flow data incorporating costly capital adjustment leads to significantly greater propagation

search theoretic models of the labor market a survey we survey the literature on search theoretic models of the labor market we show how this approach addresses many issues including the following why do workers sometimes choose to remain unemployed what determines the lengths of employment and unemployment spells how can there simultaneously exist unemployed workers and unfilled vacancies what determines aggregate unemployment and vacancies how can homogeneous workers earn different wages what are the tradeoffs firms face from different wages how do wages and turnover interact what determines efficient turnover we discuss various modeling choices concerning wage determination and the meeting process including recent models of directed search

confronting the environmental kuznets curve t he environmental kuznets curve posits an inverted u relationship between pollution and economic development kuznets s name was apparently attached to the curve by grossman and krueger 1993 who noted its resemblance to kuznets s inverted u relationship between income inequality and development in the first stage of industrialization pollution in the environmental kuznets curve world grows rapidly because people are more interested in jobs and income than clean air and water communities are too poor to pay for abatement and environmental regulation is correspondingly weak the balance shifts as income rises leading industrial sectors become cleaner people value the environment more highly and regulatory institutions become more effective along the curve pollution levels off in the middle income range and then falls toward pre industrial levels in wealthy societies the environmental kuznets curve model has elicited conflicting reactions from researchers and policymakers applied econometricians have generally accepted the basic tenets of the model and focused on measuring its parameters their regressions typically fitted to cross sectional observations across countries or regions suggest that air and water pollution increase with development until per capita income reaches a range of 5000 to 8000 when income rises beyond that level pollution starts to decline as shown in the conventional ekc line in figure 1 in developing countries some policymakers have interpreted such results as conveying a message about priorities grow first then clean up numerous critics have challenged the conventional environmental kuznets curve both as a representation of what actually happens in the development process and as a policy prescription some pessimistic critics argue that crosssectional evidence for the environmental kuznets curve is nothing more than a

who cares about biodiversity optimal conservation and transboundary biodiversity externalities the convention on biological diversity s 2010 target to reduce the rate of biodiversity loss was achieved by very few countries why we use the theory of conservation implicit in the hotelling model of non renewable resource pricing to analyze the problem distinguishing between the benefits to countries where conservation takes place and to other countries we estimate models for three taxonomic groups and find that while individual countries value conservation within their borders in poor countries this effect is dominated by the negative impact of income growth international concessional financial contributions to conservation in poor countries are found to be statistically insignificant we conclude that countries care about the biodiversity within their national borders but only when development priorities permit and only when it becomes scarce enough that its value grows more rapidly than the return on alternative assets there is little evidence that high income countries yet care sufficiently about biodiversity in the places where it is most threatened to affect conservation outcomes there

employment prospects and the propagation of fiscal stimulus abstract this paper studies a mechanism that amplifies the effects of a rise in government purchases through private consumption fiscal stimulus increases aggregate demand boosts job creation and as a consequence improves job finding rates this in turn reduces individual unemployment risk faced by households decreases precautionary motives and crowds private spending in additionally higher job finding rates affect aggregate labor market flows which raises the ratio between employed and unemployed workers as the former feature higher spending than the latter then mechanically aggregate consumption increases a calibrated model with uninsured idiosyncratic risk frictional labor market and sticky prices is used to isolate and to quantify the joint impact of these two forces the so called employment prospects channel i find that when it is shut off the drop in the values of both impact and cumulative multipliers is substantial and ranges from 32 to 38 under various monetary and fiscal policy rules

technology shocks and job flows we consider a version of the solow growth model where technological progress can be investment specific or investment neutral the labour market is subject to search frictions and the existing productive units may fail to adopt the most recent technological advances technological progress can lead to the destruction of technologically obsolete jobs and cause unemployment we calibrate the model to replicate the high persistence that characterizes the dynamics of firms neutral technology and the frequency of firms capital adjustment we find that neutral technological advances increase job destruction and job reallocation and reduce aggregate employment investment specific technological advances reduce job destruction have mild effects on job creation and are expansionary hence neutral technological progress prompts schumpeterian creative destruction while investment specific technological progress operates essentially as in the standard neoclassical growth model using structural var models we provide support to the key dynamic implications of the model copyright 2007 wiley blackwell

evaluation of biodiversity policy instruments what works and what doesn t w e review and confirm the claim that credible evaluations of common conservation instru ments continue to be rare the limited set of rigorous studies suggests that protected areas cause modest reductions in deforestation however the evidence base for payments for ecosystem services decentralization policies and other interventions is much weaker thus we renew our urgent call for more evaluations from many more biodiversity relevant locations specifically we call for a programme of research conservation evaluation 2 0 that seeks to measure how programme impacts vary by socio political and bio physical context to track economic and environmental impacts jointly to iden tify spatial spillover effects to untargeted areas and to use theories of change to characterize causal mechanisms that can guide the collection of data and the interpretation of results only then can we usefully contribute to the debate over how to protect biodiversity in developing countries

unemployment and market size without strong empirical support labour market matching models typically assume constant returns to scale in matching we construct a tractable equilibrium random matching model with a general matching technology introducing market size effects the job finding rate varies with unemployment stable steady states may occur in regions of increasing or decreasing returns and multiple equilibria are welfare ranked by market size while the standard model relies on high frequency shocks to the steady state to explain the co movement of unemployment and job finding locally decreasing returns in matching generate plausible adjustment dynamics and slower convergence lastly an extension of the hosios condition internalises search externalities

valuing research leads bioprospecting and the conservation of genetic resources bioprospecting has been touted as a source of finance for biodiversity conservation recent work has suggested that the bioprospecting value of the marginal unit of genetic resources is likely to be vanishingly small creating essentially no conservation incentive this result is shown to flow specifically from a stylized description of the research process as one of brute force testing unaided by an organizing scientific framework scientific models channel research effort toward leads for which the expected productivity of discoveries is highest leads of unusual promise then command information rents associated with their role in reducing the costs of search when genetic materials are abundant information rents are virtually unaffected by increases in the profitability of product discovery and decline as technology improvements lower search costs numerical simulation results suggest that under plausible conditions the bioprospecting value of certain genetic resources could be large enough to s

dynamite in the ekc tunnel inconsistencies in resource stock analysis under the environmental kuznets curve hypothesis recent studies incorporating consumption into the relationship between gdp and conservation increasingly reveal that economic prosperity does not lead to improvements in environmental quality even in cases where rich countries may appear to protect a greater proportion of their domestic resources this study reinforces those findings for forest and species conservation across two groups of countries additionally through explicit comparison with two previous ekc studies i enable an illustration of precisely how ekc results are affected by the incorporation of consumption and highlight persistent problems with ekc analyses despite general linear modeling results showing that wealthy countries drive deforestation in poorer countries through the import of forest resources ekc analyses can still indicate improvements in conservation for wealthier countries such contradictions suggest that recent methodological improvements to the ekc cannot guarantee the validity of evidence from ekc analyses poor quality of resource stocks data the restrictive time scales that can be examined with those data and the lack of consistent results across different groups of countries all speak to continued inadequacies of the ekc hypothesis and the need to focus on approaches that address actual behavior patterns exhibited by different income groups

collective bargaining firm heterogeneity and unemployment abstract we compare labor market outcomes under firm level and sector level bargaining in a one sector mortensen pissarides economy with firm specific productivity shocks our main theoretical results are two fold first unemployment is lower under firm level bargaining due both to a lower job destruction rate and a higher job finding rate key to this result is the interplay between firm heterogeneity and wage compression under sector level bargaining second introducing efficient opting out of sector level agreements suffices to bring unemployment down to its level under decentralized bargaining

reconciling endogenous job destruction with labor market stylized facts the role of hiring costs abstract this note considers a real business cycle model with search and matching frictions as well as purely endogenous separations in line with the model of mortensen and pissarides 1994 in order to solve the shimer 2005 puzzle this puzzle shows the inconsistency of such a model to capture the high volatility of labor market variables unemployment vacancies and cyclical property beveridge curve job creation and destruction using hiring costs rather than vacancy posting cost in this setup allows to solve this puzzle

job matching and propagation in the u s labor market the vacancy unemployment ratio and employment react sluggishly to productivity shocks we show that the job matching model in its standard form cannot reproduce these patterns due to excessively rapid vacancy responses extending the model to incorporate sunk costs for vacancy creation yields highly realistic dynamics creation costs induce entrant firms to smooth the adjustment of new openings following a shock leading the stock of vacancies to react sluggishly

unemployment dynamics in britain we examine the inter related dynamics of the unemployment flows and stock our model allows them to be linked through the standard accounting identity but also through behavioural relationships we find that for the uk the bulk of the correlation between duration and the unemployment stock arises from the dependence of duration on unemployment taking careful account of the inter temporal identity outflow shocks have contributed little to the evolution of unemployment since the late 1960s given that the correlation of duration and unemployment arises from the behavioural relationship we show that unemployment dynamics arise mostly from shocks to the inflow unemployment remains one of europe s more pressing economic and social problems as highlighted in the eu s lisbon declaration of 2000 a dynamic approach to unemployment starts from the recognition that unemployment is a stock and changes through shocks to the outflow and inflow the research and policy focus has generally been on the outflow process or equivalently unemployment duration a glance at figure 1 shows why this might be so it reveals a very strong co movement of the unemployment rate and the proportion of the unemployed out of work for a year or more analysts have used data like this to argue that the source of unemployment fluctuations has been changes in the outflow process 1 possibly as a consequence of this most policies directed at reducing unemployment focus on improving the search effectiveness and employability of the currently unemployed the unemployment flows and stock are related in quite complex ways and in this paper we focus on these inter related dynamics the model we use allows them to be linked in two ways first there is the simple accounting relationship whereby shocks to the flows accumulate in the stock second search and matching models suggest behavioural relationships of the flows depending on unemployment the presence of the nonlinear accounting identity in the model makes the analysis of the joint system problematic so we proceed sequentially investigating first one link and then the other we find that for the uk the bulk of the correlation between duration and the unemployment stock displayed in figure 1 arises from the dependence of the former on the latter we find a strong dependence of the outflow rate on unemployment taking careful account of the inter temporal identity on the other hand outflow shocks have contributed little to the evolution of unem

optimal fiscal policy with labor selection this paper characterizes long run and short run optimal scal policy in the labor selection framework quantitatively the time series volatility of the labor income tax rate is orders of magnitude larger than the tax smoothing results based on walrasian labor markets but is a few times smaller than the results based on search and matching labor markets to understand these results in terms of model primitives we develop a welfare relevant analytic concept of externalities for the selection model which we label tightness this concept of tightness is the source of the decentralized economy s inecient cross sectional wage premia between the average newly hired worker and the marginal newly hired worker compared to the traditional concept of labor market tightness in the search and matching literature this new concept of tightness plays a highly similar role and like in the matching model is crucial for understanding eciency and optimal policy

indivisible labor and the business cycle abstract a growth model with shocks to technology is studied labor is indivisible so all variability in hours worked is due to fluctuations in the number employed we find that unlike previous equilibrium models of the business cycle this economy displays large fluctuations in hours worked and relatively small fluctuations in productivity this finding is independent of individuals willingness to substitute leisure across time this and other findings are the result of studying and comparing summary statistics describing this economy an economy with divisible labor and post war u s time series

entry costs and labor market dynamics abstract we study the cyclical dynamics of the value of a vacant position in labor markets characterized by search and matching frictions we present a model of aggregate fluctuations in which firms face sunk costs to enter the production process our specification of sunk costs gives rise to a countercyclical value of a vacancy we find that this overlooked object has important quantitative implications for the study of labor markets and business cycles it affects the cyclical dynamics of the surplus division between workers and firms and provides a better characterization of the movements in income shares over recessions and expansions understanding movements in the value of a vacant position helps to link the dynamics of income shares with recent volatility puzzles found in models of search and matching in labor markets

crop biodiversity risk management and the implications of agricultural assistance this paper presents a theoretical and empirical analysis of the impact of financial assistance to farms on crop biodiversity in an uncertain setting the findings reveal that risk aversion is an important driving force for crop biodiversity conservation risk averse farmers can hedge against the uncertainty they face by allocating land to different crop species however policies intended to stabilize revenues by supporting particular species may alter this link by delinking crop biodiversity from the management of revenues risk

labor market search endogenous disasters and the equity premium puzzle abstract the present paper investigates i the endogenous disaster mechanism in a textbook search and matching model when calibrated with a constant flow value of unemployment that is close to average labor productivity and ii its contribution to solve the equity premium puzzle i offer a simple explanation for the core of the disaster mechanism the lower bound say xkink on the annuitized costs the firm incurs from investing in a match lies sufficiently close to the body of productivity s distribution if labor productivity drops close to or even below xkink for consecutive periods the firm s annuitized share in expected future productivity of a worker can either only barely or even no longer at all break even the annuitized lower bound of the costs the firm faces vacancies become unprofitable and the economy quickly enters a downward spiral the core of the mechanism relies critically on an unreasonably high and constant flow value of unemployment disasters disappear entirely for slightly smaller or procyclical values and the effects cannot be compensated by empirically plausible adjustments of the model s remaining parameters while the model can generate a sizeable equity premium combined with a small risk free rate if the flow value of unemployment is large and constant and if the coefficient of relative risk aversion and the elasticity of intertemporal substitution are both high premia again collapse by an order of magnitude in the versions of the model without disasters

valuing biodiversity for use in pharmaceutical research biodiversity prospecting has been touted as a mechanism for both discovering new pharmaceutical products and saving endangered ecosystems it is unclear what values may arise from such activities however evidence from transactions is incomplete and existing theoretical models are flawed we calculate an upper bound on the value of the marginal species even under favorable assumptions this bound is modest slightly modified assumptions lead to drastically lower estimates we extend our findings to the value of the marginal hectare of habitat and find that the incentives for habitat conservation generated by private pharmaceutical research are also at best very modest

fiscal policy in an unemployment crisis this paper shows that large scal multipliers arise naturally from equilibrium unemployment dynamics in response to a shock that brings the economy into a liquidity trap an expansion in government spending increases output and causes a fall in the unemployment rate since movements in unemployment are persistent the eects of current spending linger into the future leading to an enduring rise in income as an enduring rise in income boosts private demand even a temporary increase in government spending sets in motion a virtuous employment spending spiral with a large associated multiplier this transmission mechanism contrasts with the conventional view in which scal policy may be ecacious only under a prolonged and committed rise in government spending which engineers a spiral of increasing ination

agrobiodiversity conservation under an imperfect seed system the role of community seed banking schemes the study is an empirical investigation of agrobiodiversity conservation decisions of small farmers in the central highlands of ethiopia the primary objective is to measure the effectiveness of community seed banking csb in enhancing diversity while providing productivity incentives our results indicate a significant impact of participation in csb on farm level agrobiodiversity however the level of biodiversity conservation was not found to have the expected reinforcing impact on participation indicating no support for simultaneity csb participation also led to an increase in productivity consistent with a need for such incentives in order to enhance diversity at a farm level our assessment of the performance of the gls estimator yielded a significant discrepancy between the gls and bootstrap estimates this led to the conclusion that bootstrapping asymptotic estimations might be required for appropriate inference

the transmission of monetary policy through redistributions and durable purchases this paper studies a redistribution channel for the transmission of monetary policy using a tractable olg setting in which the government is a net debtor we show that standard open market operations omo conducted by central banks have signi cant revaluation eects that alter the level and distribution of wealth in the economy and the real interest rate expansionary omo generate a negative wealth eect the private sector as a whole is a net creditor to the government increasing households incen tives to save for retirement and pushing down the real interest rate this in turn leads to a substitution towards durables generating a temporary boom in the durable good sector with search and matching frictions a form of productive investment is added to the model and the fall in interest rates causes an increase in labour demand raising aggregate employment the mechanism can mimic the empirical responses of key macroeconomic variables to monetary policy interventions the model shows that dierent monetary interventions e g omo versus helicopter drops can have sharply dierent eects on activity

incomplete exchange rate pass through and imperfect competition the effect of local production extent to which product prices respond to exchange rate induced changes in costs this research has revealed that the percentage change in the prices of imported goods is smaller than the percentage change in exchange rates of the exporting country and that price responses differ across destinations a phenomenon termed pricing to market this finding may indicate market imperfections in international trade for example those that may arise in the case of segmented markets alternatively these empirical facts may reflect the sale of products whose production occurs in multiple locations when firms are able to shift their production across borders or alter their location of sourcing their costs will not change one for one with home country exchange rate movements and therefore their prices are unlikely to change one for one with exchange rate movements however this possibility has not been addressed empirically in the literature on pricing to market this study contributes to the literature by estimating exchangerate pass through while controlling for local production in the destination market we focus on the u s automobile market and the pricing of u s and japanese firms in particular for several reasons first we have product level information on pricing and content and there is substantial variation in destination country production across products and over time second existing studies have found evidence of pricing to market and incomplete exchange rate passthrough in automobile markets providing a useful comparison for our results and making this an appropriate market in which to study the effect of local production on exchange rate passthrough consistent with other studies we find that japanese firms partially pass through japanese cost changes to their u s customers in addition we find that this partial pass through characterizes not only japanese cost shocks but cost shocks that these japanese firms experience in their u s production this finding persists in a sample that includes both u s and japanese firms automobile firms generally do not pass through cost shocks in their entirety our data also show that those japanese auto

factor hoarding and the propagation of business cycles shocks this paper analyzes the role of variable capital utilization rates in propagating shocks over the business cycle to this end we formulate and estimate an equilibrium business cycle model in which cyclical capital utilization rates are viewed as a form of factor hoarding we find that variable capital utilization rates substantially magnify and propagate the impact of shocks to agents environments the strength of these propagation effects is evident in the dynamic response functions of various economy wide aggregates to shocks in agents environments in the statistics that we construct to summarize the strength of the propagation mechanisms in the model and in the volatility of exogenous technology shocks needed to explain the observed variability in aggregate u s output other authors have argued that standard real business cycle rbc models fail to account for certain features of the data because they do not embody quantitatively important propagation mechanisms these features include the observed positive serial correlation in the growth rate of output the shape of the spectrum of the growth rate of real output and the correlation between the forecastable component of real output and various other economic aggregates allowing for variable capital utilization rates substantially improves the ability of the model to account for these features of the data

unions in a frictional labor market abstract a labor market with search and matching frictions where wage setting is controlled by a monopoly union that follows a norm of wage solidarity is found vulnerable to substantial distortions associated with holdup with full commitment to future wages the union achieves efficient hiring in the long run but hikes up wages in the short run to appropriate rents from firms without commitment in a markov perfect equilibrium hiring is too low both in the short and the long run the quantitative impact is demonstrated in an extended model with partial union coverage and multiperiod union contracting

impulse dynamics and propagation mechanisms in a real business cycle model abstract in a typical real business cycle model we find that output dynamics are determined primarily by impulse dynamics and that endogenous propagation mechanisms are weak consequently the model must rely on external sources of dynamics in order to replicate the univariate dynamics of u s per capita gnp

home equity mobility and macroeconomic fluctuations how does a fall in house prices affect real activity this paper presents a business cycle model in which a decline in house prices reduces geographical mobility creating distortions in the labor market this happens because homeowners face declines in their home equity levels after which it becomes more difficult to provide the down payment required for a new mortgage loan unemployed homeowners therefore turn down job offers that would require them to move the model explains joint cyclical patterns in housing and labor market aggregates as well as the puzzling breakdown of the u s beveridge curve that occurred during 2009

economic prosperity biodiversity conservation and the environmental kuznets curve many conservationists contend that economic growth and biodiversity conservation are incompatible goals some economists contest this viewpoint arguing that wealthier countries have the luxury of investing more heavily in efforts to conserve biodiversity under this assumption we expect a u shaped relationship between per capita wealth and proportion of species conserved we test this environmental kuznets curve ekc using estimates of per capita income and deforestation rates index of biodiversity threat for 35 tropical countries a prior analysis dietz s adger w n 2003 economic growth biodiversity loss and conservation effort journal of environmental management 68 23 35 using conventional regression techniques failed to provide any support for the parabolic relationship predicted by the ekc hypothesis here we introduce the use of quantile regression and spatial filtering to reanalyze this data addressing issues of heteroskedasticity and spatial autocorrelation we note that preliminary analysis using these methods provides some initial evidence for an ekc however a series of panel analyses with country specific dummy variables eliminated or even reversed much of this support a closer examination of conservation practices and environmental indicators within the countries particularly those countries that drove our initial support suggests that wealth is not a reliable indicator of improved conservation practice our findings indicate that an ekc for biodiversity is overly simplistic and further exploration is required to fully understand the mechanisms by which income affects biodiversity

on crop biodiversity risk exposure and food security in the highlands of ethiopia this paper investigates the effects of crop genetic diversity on farm productivity and production risk in the highlands of ethiopia using a moment based approach the analysis uses a stochastic production function capturing mean variance and skewness effects welfare implications of diversity are evaluated using a certainty equivalent measured as expected income minus a risk premium reflecting the cost of risk we find that the effect of diversity on skewness dominates its effect on variance meaning that diversity reduces the cost of risk the analysis also shows that the beneficial effects of diversity

the economic analysis of biodiversity an assessment biodiversity is complex difficult to define difficult to measure and often involves international and intergenerational considerations biodiversity loss presents significant economic challenges a great deal of economics is required to understand the issues but a simple and important observation is that most species and ecosystems are not traded in markets so prices are often absent and biodiversity is under provided despite the formidable obstacles to high quality economic analysis economics has plenty to offer to biodiversity policy first economic valuation techniques can be employed to roughly estimate the value of the benefits provided by biodiversity and ecosystems second assessing the optimum amount of biodiversity involves recognizing that the conversion of natural capital into manufactured and human capital has so far generated vast amounts of wealth while there may have been too much biodiversity in the past economic analysis suggests that this is a difficult position to hold now third econometric techniques and carefully designed policy studies can assist in determining what policies are most suited to different contexts to cost effectively reduce biodiversity loss fourth political economy is helpful because international coordination is often required ecosystems do not respect national borders and many biodiverse ecosystems are in poorer countries this paper synthesizes the issues and proposes a research agenda which includes improving the measurement and accounting of natural capital improving valuation techniques and theory to provide greater guidance as to the optimum biodiversity and developing our understanding of the merits of different alternatives for government intervention to reduce biodiversity loss

real business cycle models and the forecastable movements in output hours and consumption the authors study the movements in output consumption and hours that are forecastable from a vector autoregression and analyze how they differ from those predicted by standard real business cycle models they show that actual forecastable movements in output have a variance about one hundred times larger than those predicted by the model the authors also find that forecastable changes in the three series are strongly positively correlated with each other on the other hand for parameters whose implications are plausible in other respects the model implies that output consumption and hours should not all be expected to move in the same direction copyright 1996 by american economic association

biodiversity poverty and development biodiversity is crucial for the production of a range of marketed and non marketed ecosystem goods and services this paper reviews the empirical evidence for the role of terrestrial biodiversity and biodiversity conservation in economic development and poverty at both the macro e g country and micro e g farm scales it first examines general relationships between biodiversity and economic development before showing how biodiversity influences ecosystem services second future scenarios and challenges for biodiversity and development are examined given projections for further changes in global population economic growth and consumption third the relationship between biodiversity protection and incomes is investigated two specific policies protected areas and bioprospecting are reviewed with respect to their impacts on the welfare of the resource dependent poor in conclusion improvements in policy design and implementation could help minimize the possibility of earth s sixth mass extinction event at least within a few generations while ensuring that the poor are not made worse off as a result of policy implementation

biofuel as social fuel introducing socio environmental services as a means to reduce global inequity the increasing cultivation of energy crops for biofuel production has significantly altered the focus of the agricultural sector but the impact of biofuel production and use is not merely an agricultural one even more importantly it is an issue which likely promotes inequitable conditions and the social conflict of different basic needs within this context the dominant argument criticizes the growing demand for biofuels in the north to compromise food security and sovereignty in the south in order to address these trade offs and conflicts the objective of this paper is the introduction of a conceptual framework of socio environmental services by expanding the construct of environmental services to explicitly include the social dimension it shall accommodate for the fact that the provision of environmental services is often embedded in a complex system of global economic ecological as well as social interdependencies recently the concept of payments for environmental services pes has received much attention with respect to its potential contribution to both environmental sustainability and the economic alleviation of poverty by linking the idea of payments for socio environmental services pses to the three functions of justice its beneficial impact may be more fully tapped

the role of labor markets for euro area monetary policy in this paper we explore the role of labor markets for monetary policy in the euro area in a new keynesian model in which labor markets are characterized by search and matching frictions we first investigate to which extent a more flexible labor market would alter the business cycle behavior and the transmission of monetary policy we find that while a lower degree of wage rigidity makes monetary policy more effective i e a monetary policy shock transmits faster onto inflation the importance of other labor market rigidities for the transmission of shocks is rather limited second having estimated the model by bayesian techniques we analyze to which extent labor market shocks such as disturbances in the vacancy posting process shocks to the separation rate and variations in bargaining power are important determinants of business cycle fluctuations our results point primarily towards disturbances in the bargaining process as a significant contributor to inflation and output fluctuations in sum the paper supports current central bank practice which appears to put considerable effort into monitoring euro area wage dynamics and which appears to treat some of the other labor market information as less important for monetary policy

does poverty constrain deforestation econometric evidence from peru this paper examines the relationship between income and land clearing for households living in tropical forest regions a simple model of the agricultural household that clears land for agriculture is developed to investigate the relationship between lagged income and cleared land holdings analysis of panel data from peru suggests that lagged income is positively correlated with clearing though at a decreasing rate and because of labor market constraints clearing is positively correlated with household labor availability this work suggests that small increases in the incomes of the poorest are unlikely to reduce deforestation in this context

the external benefits of higher education abstractthe external benefits of higher education regional studies the private market benefits of education are widely studied at the micro level although the magnitude of their macroeconomic impact is disputed however there are additional benefits of education that are less well understood in this paper the macroeconomic effects of external benefits of higher education are estimated using the micro to macro simulation approach two types of externalities are explored technology spillovers and productivity spillovers in the labour market these links are illustrated and the results suggest they could be very large however this is qualified by the dearth of microeconomic evidence for which the authors hope to encourage further work

economic and ecological trade offs of agricultural specialization at different spatial scales specialization in agricultural systems can lead to trade offs between economic gains and ecosystem functions we suggest and explore a conceptual framework in which economic gains can be maximized when production activities are specialized at increasingly broader scales from the household to the village region or above particularly when markets for outputs and inputs function well conversely more specialization likely reduces biodiversity and significantly limits ecosystem functions when agricultural specialization increases and moves to broader scales as a result of improved infrastructure and markets or other drivers ecosystem functions can also be endangered at broader spatial scales policies to improve agricultural incomes may influence the level of specialization at different scales and thus affect the severity of the trade offs this paper takes jambi province in indonesia a current hotspot of rubber and oil palm monoculture as a case study to illustrate these issues we empirically show that the level of specialization differs across scales with higher specialization at household and village levels and higher diversification towards the province level we discuss ways to resolve trade offs between economic gains and ecological costs including landscape design targeted policies and adoption of long term perspectives

business cycles and labor market search the quantitative implications of labor market search for economic fluctuations are evaluated in the context of a real business cycle model incorporating labor market search into the model is found to improve its empirical performance along several dimensions in particular hours now fluctuate substantially more than wages and the contemporaneous correlation between hours and productivity falls in addition the model replicates the observation that output growth displays positive autocorrelation at short horizons overall the empirical results suggest that the labor market search environment embodies a quantitatively important propagation mechanism copyright 1996 by american economic association

the contribution of genetic resources and diversity to wheat production in the punjab of pakistan the ability to meet the world s growing food demand dramatically improved with the release of modern semidwarf or green revolution wheat varieties in the early 1960s despite initial and subsequent success in improving yield potential and yield stability maintaining disease resistance and improving other plant characteristics the green revolution has provoked criticism and debate a major issue in this debate concerns the effect of scientific plant breeding technology on crop genetic diversity which is believed to have important implications for global and national food security and producer welfare

labor search and matching in macroeconomics abstract the labor search and matching model plays a growing role in macroeconomic analysis this paper provides a critical selective survey of the literature four fundamental questions are explored how are unemployment job vacancies and employment determined as equilibrium phenomena what determines worker flows and transition rates from one labor market state to another how are wages determined what role do labor market dynamics play in explaining business cycles and growth the survey describes the basic model reviews its theoretical extensions and discusses its empirical applications in macroeconomics the model has been developed against the background of difficulties with the use of the neo classical frictionless model of the labor market in macroeconomics its success includes the modelling of labor market outcomes as equilibrium phenomena the reasonable fit of the data and when inserted into business cycle models improved performance of more general macroeconomic models at the same time there is evidence against the nash solution used for wage setting and an active debate as to the ability of the model to account for some of the cyclical facts

property rights genetic resources and biotechnological change it is well recognized that wild genetic resources the genetic constitutions of plants and animals have substantial social and economic value as repositories of genetic information today genetic information provides direct and indirect inputs into plant breeding programs the development of natural products including drugs and pharmaceuticals and increasingly sophisticated applications of biotechnology 2 recognition of the potential of wild genetic resources in the development of drugs has led the national cancer institute to initiate a massive plant collection project 3 which is a follow up to an earlier 1970s project that sought to identify drugs effective against a variety of cancers and to look at the immune system effects of various drugs it is estimated that 70 percent of the 3 000 species known to have anticancer properties are found in the tropical forests 4 in recent years a number of widely used drugs have been developed from plants including two important anticancer drugs derived from the rosy periwinkle found in tropical madagascar with the recent major breakthroughs in biotechnology the future potential of these resources seems limitless species that have no current commercial application have useful natural chemicals or are as yet undiscovered never

foreign labor costs and domestic employment what are the spillovers abstract this paper studies the international spillover effects of country specific labor cost changes in the presence of labor market frictions a two country model with search frictions predicts that a cut in foreign labor costs leads to an increase in domestic employment driven by a positive terms of trade effect on job creation i find empirical evidence in support of this positive spillover effect the terms of trade channel and the dependence on the degree of labor market rigidity this is done by a panel regression that estimates the effect of exogenous variation in foreign unit labor costs instrumented by changes in foreign statutory social security contribution rates on domestic employment and output