discounting and divergence of opinion the objective of this paper is to adopt a general equilibrium model and determine the socially efficient discount factor risk free rate and discount rate when there are heterogeneous anticipations about the growth of the economy as well as heterogeneous time preference rates among others we tackle the following questions is the socially efficient discount factor an arithmetic average of the individual subjectively anticipated discount factors more generally can the arrow debreu prices the risk free rates the subjectively expected socially efficient discount factors and discount rates be obtained as an average of the individual subjectively anticipated ones can beliefs dispersion be analyzed as a sort of additional risk or uncertainty leading to possibly lower discount rates is it socially efficient when diversity of opinion is taken into account to reduce the discount rate per year for more distant horizons if so what is the trajectory of the decline

aid for the poorest some early lessons of uk experience the paper presents an interim review of recent attempts to reach the poorest people in developing countries through aid policy from the viewpoint of one donor the united kingdom it concludes that the uk has achieved a modest increase in the proportion of aid aimed at the poorest between 1974 and 1979 that poverty focused projects are in general more local cost intensive and have lower rates of return than others and that the principal difficulties in the way of successful implementation of poverty focused projects are excessive size an over rapid rate of disbursement inadequate local cost provisions and failure to specify the target group or the repayment strategy with sufficient precision it is argued that there are political obstacles to removing the second and third of these obstacles in donor countries and to removing the fourth in recipient countries also

the evolution of time preference with aggregate uncertainty we examine the evolutionary foundations of intertemporal preferences when all the risk affecting survival and reproduction is idiosyncratic evolution selects for agents who maximize the discounted sum of expected utility discounting at the sum of the population growth rate and the mortality rate aggregate uncertainty concerning survival rates leads to discount rates that exceed the sum of population growth rate and death rate and can push agents away from exponential discounting

wage rigidity in canadian collective bargaining agreements the authors search information on the provisions of 10 947 wage contracts signed in the canadian unionized sector between 1976 and 1999 for evidence of downward nominal wage rigidity the disinclination of wages to fall in nominal dollars below their established level over the sample period real wage reductions were common but nominal wage reductions were rare the probability of downward nominal wage rigidity increased substantially during low inflation periods during such periods apparently there was no reduction in the incidence of real wage cuts but the magnitude of those cuts was modest suggesting a lesser ability of wages to adjust to labor market conditions than at other times

the recurrent cost problem in the least developed countries the manifestation of the recurrent cost problem at the micro and macro levels is continuing if not worsening least development the article examines the causes of the recurrent cost problem and shows that there is no one simple cause and that responsibility lies in varying degrees between the least developed country governments and their aid partners given the diversity of the possible causes of the recurrent cost problem a broad package of measures including domestic policy changes and international support measures are proposed

distributional preferences and the incidence of costs and benefits in climate change policy we explore the relationship between willingness to pay wtp for climate change mitigation and distributional preferences by which we mean individuals opinions about who should be responsible for climate change prevention and whether the share of climate change impacts borne by the poor is a cause for concern we use 1 770 responses to an online stated preference survey the domestic costs in our survey s policy choice scenarios are expressed as a set of randomized shares across four different payment vehicles and the international cost shares are randomized across four groups of countries we also elicit respondents perceptions of the likely regressivity of climate change impacts under a policy of business as usual wtp is higher when larger cost shares are borne by parties deemed to bear a greater responsibility for mitigation and when respondents believe and care that the impacts of climate change may be borne disproportionately by the world s poor that wtp for an environmental policy depends on the distributional consequences of the policy is an unsettling result efficiency assessments are typically assumed to be separate from equity considerations in most benefit cost analyses

the determinants of wage changes in indexed and nonindexed contracts a switching model wage changes in a sample 1979 86 of canadian wage contracts are analyzed the sample is split into cost of living allowance cola and non cola contracts econometric estimation corrects for sample selectivity bias in non cola contracts the unemployment rate and a proxy for expected inflation are significant expected industry price changes and productivity changes exert smaller but significant effects in cola contracts ex ante inflation coverage ranges between 60 and 100 of expected inflation catch up for previous uncompensated inflation the unemployment rate and expected inflation are also significant a common wage structure across cola and non cola contracts is rejected by the data

climate policy and the social cost of power generation impacts of the swedish national emissions target the purpose of this paper is to discuss how the design of climate policy in a small open economy may affect the internalization of carbon related external costs and ultimately the social choice between different power generation technologies empirically we focus on the swedish case and analyze three climate policy regimes out of which two represent different national goal formulations and thus compliance strategies the results show that the social choice between power generation technologies in sweden will be significantly influenced by the choice of climate policy regime most notably if sweden would abandon its present national target for carbon dioxide emissions and instead make full use of the country s participation in international emissions trading natural gas fired power would replace onshore wind power as the power generation source with the lowest social cost

structural determinants of government budget deficits in developing countries abstract the purpose of this study is to examine the possibility that certain structural factors make some developing countries more likely to incur government budget deficits than others empirical evidence is provided to support the hypotheses that developing countries are likely to have larger government budget deficits the lower their level of economic development the greater the degree of government participation in the economy and the less control exercised over government expenditures less convincing support is given for the hypothesis that revenue instability contributes to government budget deficits an unexpected result of the study is that growth of government revenues is positively related to budget deficits which leads the author to consider the possibility of a please effect

the political economy of the recurrent cost problem in the west african sahel abstract the syndrome of development projects in agriculture and the social sectors languishing after completion of their foreign aided establishment phase due to lack of host government budget support is particularly characteristic of though by no means limited to the eight countries of the west african sahel a two year study of the problem by a multilateral working group attributed the problem substantially to donor policies causing recipients to attach a low opportunity cost only a fraction of nominal value to project specific aid resources as against the high opportunity cost corresponding to a shadow price well over 1 0 attached to use of their own uncommitted budget resources

the stern review a deconstruction using a simple model designed for transparency but nonetheless calibrated to support the much quoted damage estimates of the stern review of the economics of climate change we demonstrate significant sensitivity of those results to assumptions about the pure rate of time preference the time horizon and the rates of risk and equity aversion used to compute certainty and equity equivalent annuities most importantly we demonstrate enormous sensitivity to presumed constant regional vulnerability and underlying assumptions about adaptive capacity manipulation of any of these parameters one at a time across reasonable ranges can diminish damage estimates by as much as 84 or in the case of extending the time horizon with the review s low discount rate increase damage estimates by 900 we also confirm the usual result that limiting atmospheric concentrations to specific benchmarks above 400 ppm cannot eliminate all damages nonetheless we applaud the stern review author team for reconfirming that the climate problem can be approached productively as an economic problem whose solutions can be explored with the tools of decision analysis 2008 elsevier ltd all rights reserved

how high is the private gain from wage indexation the effects of firm specific shocks on the gain from writing state contingent wage contracts are examine in an extension of the model in gottfries 1992 it is shown that the introduction of firm specific uncertainty increases the gain from indexation to prices only moderately moreover nominal wage contracts should be more prevalent when unemployment benefits are high or unemployment spells are short

a review of the stern review on the economics of climate change the stern review calls for immediate decisive action to stabilize greenhouse gases because the benefits of strong early action on climate change outweighs the costs the economic analysis supporting this conclusion consists mostly of two basic strands the first strand is a formal aggregative model that relies for its conclusions primari ly upon imposing a very low discount rate concerning this discount rate aspect i am skeptical of the review s formal analysis but this essay points out that we are actual ly a lot less sure about what interest rate should be used for discounting climate change than is commonly acknowledged the review s second basic strand is a more intuitive argument that it might be very important to avoid possibly large uncertain ties that are difficult to quantify concerning this uncertainty aspect i argue that it might be recast into sound analytical reasoning that might justify some of the review s conclusions the basic issue here is that spending money to slow global warming should perhaps not be conceptualized primarily as being about consump tion smoothing as much as being about how much insurance to buy to offset the small change of a ruinous catastrophe that is difficult to compensate by ordinary savings

the emergence of a regional financial architecture in asia this paper provides an assessment of monetary and financial cooperation in asia since the regional financial crisis of 1997 98 with a view to determining whether the emerging regional financial architecture in asia is compatible with the global financial architecture and what are the prospects for possible economic and monetary union monetary and financial cooperation has focused on four architectural pillars economic policy surveillance crisis prevention liquidity support and bond market development which can be consistent with the global architecture however progress toward full integration is likely to be gradual and experimental given the lack of strong regional institutions regional economic disparities and the need to build political commitment to such a goal

economic environment and agricultural development the importance of macroeconomic policy abstract this article explores the ways in which the macroeconomic balance of the economy and related policies impinge on agriculture in developing countries and considers implications for the design of policies it argues that the extent of macroeconomic balance and the quality of the policies influencing that balance to a large extent define the scope for effective agricultural policies the avoidance of severe balance of payments deficits and rapid inflation are seen as a necessary condition for the promotion of agricultural growth they also have an important influence on the nature and range of agricultural policy options available to governments

numerical analysis of non constant pure rate of time preference a model of climate policy abstract when current decisions affect welfare in the far distant future as with climate change the use of a declining pure rate of time preference prtp provides potentially important modeling flexibility the difficulty of analyzing models with non constant prtp limits their application we describe and provide software available online to implement an algorithm to numerically obtain a markov perfect equilibrium for an optimal control problem with non constant prtp we apply this software to a simplified version of the numerical climate change model used in the stern review for our calibration the policy recommendations are less sensitive to the prtp than widely believed

did the stern review underestimate us and global climate damages abstract the stern review received widespread attention for its innovative approach to the economics of climate change when it appeared in 2006 and generated controversies that have continued to this day one key controversy concerns the magnitude of the expected impacts of climate change stern s estimates based on results from the page2002 model sounded substantially greater than those produced by many other models leading several critics to suggest that stern had inflated his damage figures we reached the opposite conclusion in a recent application of page2002 in a study of the costs to the us economy of inaction on climate change this article describes our revisions to the page estimates and explains our conclusion that the model runs used in the stern review may well underestimate us and global damages stern s estimates from page2002 implied that mean business as usual damages in 2100 would represent just 0 4 percent of gdp for the united states and 2 2 percent of gdp for the world our revisions and reinterpretation of the page model imply that climate damages in 2100 could reach 2 6 percent of gdp for the united states and 10 8 percent for the world

stabilization the political economy of overkill abstract this paper considers whether national and international aspects of the imf s stabilization programmes during the 1970s and early 1980s have resulted in a process of overkill or in other words a process of economic retrenchment which went much further than was strictly necessary in terms of what could have been regarded as reasonable objectives in the international context the author describes how the attack on inflation has become an end in itself at the expense of other stated objectives of the imf thus creating a distortion of its priorities the paper discusses errors of diagnosis which have led to this disorientation and explains why deflationary policies should not be regarded as a panacea the paper then considers the nead for equity and efficiency in the distribution of the political and economic costs of adjustment the next section of this paper discusses the assumptions underlying the imf s treatment of fund members and to what extent even handedness in the application of stabilization measures may result in inequality of burden sharing among borrowers problems related to monetarist theories and the consequent policies are examined followed by a consideration of the dangers involved in devising straightforward performance criteria in the form of precise monetary targets that can readily be monitored by the imf this means of evaluating the national adjustment policies success is seen to be unsatisfactory viz the frequency of stand by arrangement breakdowns and mistakes in forecasting the paper concludes that the concept of unilateral adjustment is not an acceptable basis for imf supervision of the international monetary system in addition care should be taken to avoid overkill in determining the degree and character of adjustment needed in stabilization programmes one possible solution to the extra burden imposed on the ldcs might be a liberalization of the compensatory financing facility with the objective of applying the same kind of regime to imports as to exports

stabilizing the global climate a simple and robust benefit cost analysis the crucial issues are typically addressed using large scale models each of which is the product of many researcher years and would require an intensive effort to understand what is needed to resolve these difficulties is a simple and robust analytical framework in which policy responses to climate change can be assessed on the basis of a small number of input parameters to take this a step further the input parameters themselves must be derived from a comprehensible process given the complexity of the standard models of climate economic activity and energy use this task might seem hopeless the crucial observation is that given a quadratic loss function from uncontrolled climate change and a quadratic abatement cost curve the optimal pair is robust to quite large changes in estimates of the most uncertain input parameter namely the cost of unmitigated climate change under bau

a new global deal on climate change a global target of stabilizing greenhouse gas concentrations at between 450 and 550 parts per million carbon dioxide equivalent ppm co2e has proven robust to recent developments in the science and economics of climate change retrospective analysis of the stern review 2007 suggests that the risks were underestimated indicating a stabilization target closer to 450 ppm co2e climate policy at the international level is now moving rapidly towards agreeing an emissions pathway and distributing responsibilities between countries a feasible framework can be constructed in which each country takes on its own responsibilities and targets based on a shared understanding of the risks and the need for action and collaboration on climate change the global deal should contain six key features i a pathway to achieve the world target of 50 per cent reductions by 2050 where rich countries contribute at least 75 per cent of the reductions ii global emissions trading to reduce costs iii reform of the clean development mechanism to scale up emission reductions on a sectoral or benchmark level iv scaling up of rd v an agreement on deforestation and vi adaptation finance

a regional dynamic general equilibrium model of alternative climate change strategies outcomes and noncooperative equilibria this study finds that cooperative policies show much higher levels of emissions reductions than do noncooperative strategies that there are substantial differences in the levels of controls in both the cooperative and the noncooperative policies among different countries and that high income countries may be the major losers from cooperation jel h41 q4 q2 q20

a review of the stern review on the economics of climate change how much and how fast should we react to the threat of global warming the stern review argues that the damages from climate change are large and that nations should undertake sharp and immediate reductions in greenhouse gas emissions an examination of the review s radical revision of the economics of climate change finds however that it depends decisively on the assumption of a near zero time discount rate combined with a specific utility function the review s unambiguous conclusions about the need for extreme immediate action will not survive the substitution of assumptions that are consistent with today s marketplace real interest rates and savings rates

the impact of climate change on the balanced growth equivalent an application of fund the stern review added balanced growth equivalents bge to the economic climate change research agenda we first propose rigorous definitions of the bge for multiple regions and under uncertainty we show that the change in the bge is independent of the assumed scenario of per capita income for comparable welfare economic assumptions as the stern review we calculate lower changes in bge between a business as usual scenario and one without climate impacts with the model fund than the stern review found with the model page we find that mitigation policies give even lower changes in bge and argue that those policy choices should be the focus of the research effort rather than total damage estimates according to our results the current carbon tax should be below 55 tc sensitivity analyses show that the stern review chose parameters that imply high impact estimates however for regionally disaggregated welfare functions we find changes in bge that are significantly higher than the results from the stern review both for total damage as for policy analysis with regional disaggregation and high risk aversion we observe fat tails and with that very high welfare losses

on modeling and interpreting the economics of catastrophic climate change with climate change as prototype example this paper analyzes the implications of structural uncertainty for the economics of low probability high impact catastrophes even when updated by bayesian learning uncertain structural parameters induce a critical tail fattening of posterior predictive distributions such fattened tails have strong im plications for situations like climate change where a catastrophe is theoretically possible because prior knowledge cannot place sufficiently narrow bounds on overall damages this paper shows that the economic consequences of fat tailed structural uncertainty along with unsureness about high temperature damages can readily outweigh the effects of discounting in climate change policy analysis

nominal wage rigidity in contract data a parametric approach using wage agreements reached in the canadian unionized sector during 1976 99 a period of high as well as exceptionally low inflation we consider how histograms of wage adjustment changed as inflation reached the low levels of the 1990s the histograms and parametric tests suggest that wage adjustment is characterized by downward nominal rigidity and significant spikes at zero there is some evidence of modest menu cost effects we examine whether the rigidity features of wage adjustment are sensitive to indexation provisions and investigate whether the distinction between short and long contracts is useful