the effect of changes in reserve requirements on bank stock prices abstract the present study re examines the tax burden effects of reserve requirements on bank profitability it differs from previous work in two ways 1 changes in stock prices rather than accounting data are used to measure profitability effects and 2 emphasis is placed on changes in reserve requirements as opposed to their level regarding the latter distinction two kinds of changes are considered 1 temporary changes in reserve requirements for the purpose of discretionary monetary policy and 2 more permanent changes in reserve requirement levels based on the event study methodology temporary changes were found to have little effect on security prices whereas more permanent changes had a stronger influence on bank stock prices reflecting a tax burden effect

reserve requirements bank share prices and the uniqueeness of bank loans abstract this study examines the impact of changes in reserve requirements on large banks stock returns it finds statistically and economically significant abnormal returns on the day following the announcement of such changes this finding is consistent with the notion that reserve requirements are a tax on deposits it indicates however that bank s shareholders bear at least part of the tax thus it does not support the hypothesis advanced by some authors that the tax falls exclusively on banks borrowers the evidence further suggests that part of the tax falls on demand depositors these findings undercut the case for the uniqueness of bank loans insofar as it is based on the incidence of the deposit tax

economic implications of intergenerational equity for biodiversity conservation the rights of future generations to enjoy sustainable development have been formally recognised internationally this has important implications for the economic analysis of biological diversity which as an integral attribute of natural capital is of critical importance to both current and future generations the dominant economic paradigm involves no explicit recognition of the rights of future generations thus it can give rise to outcomes of dubious intergenerational equity merit rawls contractarian theory attributes intrinsic value to rights and is considered here in relation to the intergenerational distribution of natural resources some problems of theoretical and practical character for the implementation of the rawlsian approach are noted an incremental and adaptive learning process in the use and distribution of natural resources is recommended in order to ensure the well being of future generations three degrees of intergenerational equity are derived i extensive ii intermediate and iii minimal in terms of biodiversity conservation this implies an ethical base for countries to at least fund the establishment of protected area pa systems therefore economic analysis should not be used at this conceptual level to decide if pa systems should or should not be established this question would necessarily be answered in the affirmative on the basis of the interests of future generations at the practical level of deciding which specific ecosystems should make up particular pa systems economic analysis should a contribute to a holistic approach to the identification of the areas to be protected b investigate the most cost effective way of carrying out the initiative c assess of the intragenerational equity outcomes and d consider the institutional features relevant to the successful implementation of the conservation initiative

the livelihood impacts of cash transfers in sub saharan africa beneficiary perspectives from six countries summary cash transfers cts are a social protection mechanism to reduce the poorest households vulnerability to shocks and build human capital by smoothing consumption and sustaining expenditure on education and social welfare our study examines whether and how cts go beyond welfare objectives to promote livelihoods presenting a cross case analysis using original qualitative data on beneficiary perspectives from six african countries kenya ethiopia malawi lesotho zimbabwe and ghana we explore ct livelihood impacts within household economies and social networks paying attention to gender issues we find that a small but predictable flow of cash improves strategic livelihood choices and stimulates productive investments including through positive effects on beneficiary entry into risk sharing arrangements and networks for economic collaboration levels of household vulnerability and labor constraint nevertheless significantly mediate the ability of cts to consolidate livelihood outcomes the varying availability of economic opportunities plus effective program implementation also shape livelihood impact incorporating beneficiary perspectives brings to the fore the multi dimensionality of ct effects on experiences of poverty and deprivation including gender dynamics and intangibles such as dignity and respect they add powerful realism to the influence of the ct on both immediate survival and livelihood choices beyond this they confirm wider knowledge on productive impact and bring nuance to the conditions under which and mechanisms by which beneficiaries use cts to build productive capability and assets and to make strategic livelihood choices

the rainforest supply price a tool for evaluating rainforest conservation expenditures abstract economic policies are often suggested as mechanisms for promoting rainforest conservation in developing countries to help decide whether international resources should be used to protect specific rainforests the calculation of a rainforest supply price rsp is proposed korup national park in cameroon contains the oldest rainforest in africa and as a haven for important endangered species it is the subject of active international conservation efforts a cost benefit analysis of a conservation project to protect korup from increased land use pressures suggests that it is not in cameroon s interest unless a 5 4 million ecu inducement is transferred to cameroon given the protection afforded the transfer is equivalent to a rsp of 1060 ecu per km2 per year evaluations of six other tropical rainforest projects suggest that international donors made transfers having values ranging from 15 to 1575 ecu per km2 per year it is thus concluded that the inducements required are within a range that conservation interests are apparently willing to mobilize

employment creation and green development strategy employment creation has received surprisingly little attention in the literature on environmental economics this paper argues for closer ties between sustainable development and employment creating development at both the global and the national levels of planning and policy the paper briefly reports on the employment challenge confronting indonesia to highlight the jobs versus environment dilemma facing a developing country that is rich in natural resources but densely populated it is argued that the high income countries of the north should take the initiative in raising funds through ecotaxes levies on international trade and other appropriate income policies in order to increase investment flows for job creating development in the south to make sustainability a practical reality

what s different among banks abstract based on commercial paper being a nearly perfect substitute for certificates of deposits cds and cd reserve requirements creating a higher cost of funds for banks fama shows that the banking industry must have some monopoly power relative to other financial institutions his analysis does not resolve whether this monopoly power is vested in banks collectively vis a vis other financial institutions or if the monopoly power extends to the level of individual banks using an event study framework to examine the elimination of a reserve requirement we find significant evidence of monopoly power at the level of individual banks

the market valuation effects of reserve regulation abstract we demonstrate that the financial market s reaction to changes in reserve regulation implies that reserve requirements are an excise tax on banking activities changes in reserve requirements do not influence yields on treasury securities or returns on broad based portfolios of nonfinancial stocks and thus do not impound new information about monetary policy moreover changes in reserve requirements have an impact on nonbank financial firms that is opposite in sign to that of banks this suggests that reserve requirements shift the locus of some financial activities from the banking sector to the nonbank sector of the financial system

market evidence on the effective maturity of bank assets and liabilities the recent years increase in interest rate volatility has intensified concern over the exposure of commercial banks to interest rate or funding risk since the effect of interest rate changes on the equity value of a bank depends on the maturity or duration of the bank s assets and liabilities assessing an individual bank s interest rate risk exposure requires information about the maturity composition of its portfolio it is difficult however to assess a bank s risk exposure from balance sheet data because several important asset and liability items have theoretically ambiguous effective maturities in a frictionless market a security s effective maturity will equal its stated maturity or time to repricing with market imperfections e g depositors transaction or information costs however the equilibrium cost of some deposit items may respond sluggishly or incompletely to market rate changes see hester and pierce 1975 or flannery 1982 such liabilities market values discounted at market rates would therefore fluctuate with the level of interest rates these liabilities are sometimes called core deposits which manifest sticky responses to market rate changes we define an asset or liability s effective maturity as the maturity of a fixed rate perfectly elastically supplied security with the same market value elasticity as the bank balance sheet item under consideration naturally a balance sheet item s effective maturity is the relevant determinant of its contribution to the bank s overall interest rate risk sensitivity

what s different about banks abstract negotiable certificates of deposit cd s trade in the capital market in competition with other securities like commercial paper and bankers acceptances if cd s must pay lenders competitive monetary interest the reserve tax on cd s is borne by bank borrowers viability of the tax means there must be something special about bank loans that makes some borrowers willing to pay higher interest rates than those on other securities of equivalent risk moreover there must be something special about banks that prevents other intermediaries from competing to assure that it never pays to finance loans with cd s

improving human development a long run view abstract the pessimistic flavour of the human development reports appears to be in contradiction with their own numbers as developing countries fare comparatively better in human development than in per capita gdp terms this paper attempts to bridge this gap by providing a new improved human development index ihdi informed by welfare economics the ihdi is presented here alongside the united nations development programme s undp hdi for the world and its main regions since the late 19th century social dimensions in the ihdi are derived following kakwani journal of development economics 41 1993 pp 307 336 with a convex achievement function whereas a geometric average is employed to combine its dimensions longevity knowledge and income thus the ihdi does not conceal the gap between rich and poor countries and casts a much less optimistic view than the conventional undp index while it fits with the undp concern for international differences the paper s findings highlight main weaknesses in human development dimensions of present day developing countries

converting asset holdings into livelihood an empirical study on the role of household agency in south africa summary this paper analyzes the complexities of converting assets into livelihood and the role that agency constraints play drawing inspiration from the capabilities approach and using household data from south africa linkages between assets and agency are identified by decomposing asset endowments impact on future livelihood by employing a method of path analysis akin to early heritability of traits studies theoretical asset based studies of chronic poverty are bridged with capabilities literatures the interaction between assets and agency is shown to be as important as asset to asset complementarities the results have wide ranging policy implications

capitals and capabilities a framework for analyzing peasant viability rural livelihoods and poverty abstract on the basis of themes emerging in current debates on rural development in latin america this paper develops an analytical framework for analyzing rural livelihoods in terms of their sustainability and their implications for rural poverty the framework argues that our analyses of rural livelihoods need to understand them in terms of a people s access to five types of capital asset b the ways in which they combine and transform those assets in the building of livelihoods that as far as possible meet their material and their experiential needs c the ways in which people are able to expand their asset bases through engaging with other actors through relationships governed by the logics of the state market and civil society and d the ways in which they are able to deploy and enhance their capabilities both to make living more meaningful and to change the dominant rules and relationships governing the ways in which resources are controlled distributed and transformed in society particular attention is paid to the importance of social capital as an asset through which people are able to widen their access to resources and other actors

the total economic value of amazonian deforestation 1978 1993 national income accounting has been criticized because of its failure to encompass the notion of sustainability several studies address this problem through green income accounting i e by adjusting conventionally measured gdp for reduction in a given country s stock of natural resources these studies generally base value on the unit net price of the resource other studies go beyond net price emphasizing a natural resource s total economic value tev that is its non marketable as well as its marketable values this paper combines the green income accounting and tev approaches and applies the new framework to brazil in order to assess the foregone economic benefits resulting from amazonian deforestation the results lend support to calls for greater policy emphasis on conservation of unique and irreplaceable ecosystems 2000 elsevier science b v all rights reserved

an analysis of the impact of deposit rate ceilings on the market values of thrift institutions this paper examines the impact of changes in deposit interest rate regulations on the common stock values of savings and loan institutions the analysis indicates that stockholder owned savings and loans s l s have experienced statistically significant declines in equity market values at the announcement of the removal of ceilings on certain consumer small saver certificate accounts and the introduction of short term variable rate money market certificates we find the evidence to be consistent with the hypothesis that s l s have earned economic rents from restrictions on interest rates paid to small saver accounts and that relaxation of interest rate ceilings has reduced these rents a central issue in the economics of regulation is whether regulators behave in a way that primarily benefits the economic agents whose actions they are supposed to regulate the proposition that regulation is demanded and acquired by the regulated and that regulations are designed and administered primarily for their benefit was originally put forth by stigler 19 and has come to be known as the capture theory of regulation an alternative view is that regulators adopt policies which serve some other perhaps public or possibly the regulators own interest and that administration of these policies does not benefit the regulated entities this paper examines the regulation of savings and loan associations deposit interest rates and reports evidence pertaining to the impact of the administration of regulation regulation of interest rates paid to depositors in federally insured savings and loan associations began in 1966 since that time several changes in the maximum allowed interest rates deposit rate ceilings have been made these changes present an opportunity to observe the impact of one form of regulatory action on savings and loan institutions deposit rate regulation has been the subject of extensive previous research the empirical investigations have focused primarily on two issues 1 the allocational efficiency and wealth redistribution effects of rate ceilings and 2 the impact of deposit rate ceilings on the flow of funds into the residential

financial intermediation and delegated monitoring this paper develops a theory of financial intermediation based on minimizing the cost of monitoring information which is useful for resolving incentive problems between borrowers and lenders it presents a characterization of the costs of providing incentives for delegated monitoring by a financial intermediary diversification within an intermediary serves to reduce these costs even in a risk neutral economy the paper presents some more general analysis of the effect of diversification on resolving incentive problems in the environment assumed in the model debt contracts with costly bankruptcy are shown to be optimal the analysis has implications for the portfolio structure and capital structure of intermediaries

the information content of discount rate announcements and their effect on market interest rates this paper presents evidence that throughout the 1973 85 period the federal reserve systematically used certain types of discount rate a nnouncements to signal changes in its policy instrument the federal funds rate market participants understood the signals contained in d iscount rate announcements and used them to revise their expectations of the funds rate these revisions in funds rate expectations caused movements in treasury bill rates copyright 1988 by ohio state university press

on corporate governance a study of proxy contests abstract this paper examines a sample of firms experiencing proxy contests for seats on their board of directors dissident shareholders usually fail to obtain a majority of board seats nevertheless they capture some seats via mechanisms such as cumulative voting in over half of the sample contests regardless of proxy contest outcome positive and statistically significant share price performance is associated with the contest that finding is predicted by the standard economic analysis of proxy contests in which the challenges benefit shareholders by improving corporate performance the finding runs counter to the claim of berle 1962 that the economists view of proxy contests is a wholly imaginary picture a portion of the positive share price changes taking place in the early stages of some proxy contests is not permanent however and as suggested by manne 1962 is at least partially attributable to temporary increases in the market value of the vote attached to corporate shares

financial intermediation and the optimal tax system in this paper a stylized general equilibrium model is constructed to analyze the relative efficiency of taxing financial intermediaries a crucial feature of the model is that tax collection costs are endogenous i e they result from primitive assumptions about information and transaction costs instead of being assumed ad hoc the model provides useful insights into the welfare costs and incidence of banks reserve requirements or equivalently of a tax on deposits in particular it is shown that a tax on bank deposits can be part of an optimal tax system provided banks monopoly power is significant however if the banking industry is perfectly competitive the first dollar of revenue is more efficiently collected by a uniform capital income tax although a strictly positive welfare loss is incurred

estimating the costs of environmental protection in brazil abstract in this paper an effort is made to estimate the amounts of money the government of the state of sao paulo brazil must transfer to counties in which environmentally protected areas of any sort have been established by the state a methodology to estimate these transfers is proposed based on the potential loss of production in the protected areas and the corresponding amounts are calculated the results indicate that protecting 7 68 of the state s territory will cause a maximum decrease in its gdp of 0 05 the estimation of monetary values for environmental costs is of interest because it provides a basis for judgement among different environmental protection alternatives and between these and other investment projects

distribution of ecological entitlements implications for economic security and population movement abstract the concept of economic and environmental security is explored in a broad sense as a series of necessary entitlements to forest and other resources traditional measures of inequality such as the gini coefficient or the atkinson index of inequality which rely on measures of the distribution of formal cash income or wealth are regarded as flawed to the extent that they do not adequately reflect the value and distribution of access to non marketed goods and services an ecologically sensitive atkinson or gini index is proposed as a more relevant measure of inequality and of economic and environmental security to improve security policies must attempt to improve the value of these indices an empirical example is provided based on household survey data for 357 households in 24 villages in a rainforest zone of cameroon analyses of data relating to forest use incomes and demographics provides insights into the distribution of ecological entitlements across various income groups and into the impacts of these entitlements on economic and environmental security through measures related to population migration the empirical analysis demonstrates a number of important conclusions a use of ecologically adjusted indices provides a more complete picture of inequality inequality in the forest zone is less pervasive than traditional measures would have us believe b traditional forest entitlements contribute positively to reducing inequality and improving security and c income support programs targeted to conventional cash crops cocoa and coffee increase inequality and reduce security the analyses also demonstrate that when other economic factors have been taken into account population movement can be a useful indicator of environmental security an analysis of migration demographic and income patterns suggests that low population movement in this zone can be construed as an indicator of higher environmental security the analysis also provides direct evidence that a decline in ecological entitlements increases the probability of migration out of an area

avoiding the resource curse indigenous communities and canada s oil sands summary concerns about a resource curse in canada have been raised in response to rapid growth in the petroleum sector in northern alberta in previous research there has been little consideration of how symptoms of the resource curse are experienced and managed at a regional scale and by indigenous communities an analysis of effects and responses is offered using a natural financial human and social capitals framework without consideration of how to manage the symptoms of the resource curse oil and gas activity is likely to further disadvantage indigenous populations already living on the margins of canadian society

local capacity village governance and the political economy of rural development in indonesia summary this paper develops a framework for conceptualizing local capacity to address village level livelihood and governance problems the framework is based on an analysis of asset distribution combined with an explicit analysis of the links between processes of state formation state business linkages and local forms of social capital the framework is used to discuss findings from recent research on village capacity in rural indonesia the discussion suggests that it is possible to link a political economic approach to rural development with recent conceptualizations of social capital such an analysis can illuminate the forms taken by and the effectiveness of village level collective action in ways that either purely political economy or social capital approaches do not

flows funds and the complexity of deprivation using concepts from ecological economics for the study of poverty abstract poverty has been increasingly conceptualized as being multidimensional involving deprivation in many dimensions of life this paper discusses issues and implications of multidimensional poverty by adopting concepts commonly used in ecological economics in particular poverty is approached as an irreducible complex phenomenon for which many legitimate but non equivalent descriptions exist issues of social and technical incommensurability are illustrated for different meanings and measurement types of poverty georgescu roegen s flow fund framework is interpreted informed by the capability approach of amartya sen the paper argues that a predominant focus on flows as a proxy to analyze poverty represents rather a short term perspective on access to satisfiers to fulfill particular needs contrary to that focusing on valued funds may provide useful information for the analysis of capabilities that persons and societies might pursue in the long term furthermore it is argued that strong poverty alleviation needs to adopt analytical tools that can deal with non trade off cases improvements in one poverty dimension cannot always compensate for the deterioration of other poverties this implies to rethink the usefulness of aggregate multidimensional poverty indices as well as the predominant use of income measures

do we really care about biodiversity this paper addresses from an economic perspective the issue of global biodiversity conservation it challenges the perception that the world really cares a great deal about biodiversity and is prepared to pay the full cost of maintaining this stock of natural capital despite the existence of a plethora of international agreements there still seems to be a global deficit of care surrounding efforts to combat challenges such as those posed by global warming and biodiversity conservation more light can be thrown on the degree of care by measuring both the actual expenditures and the stated willingness to pay for biodiversity conservation however actual expenditures are much lower than willingness to pay estimates recorded in the published literature using the criteria that the right amount of conservation effort is one where the marginal economic benefits from conservation just equal the marginal costs of conservation the paper explores the biodiversity conservation conundrum and concluded that on the available evidence the world does not care too much about this natural capital stock and bequests to future generations

editorial human capital and human capability i would like to comment on the connection as well as contrast between two distinct but related areas of investigation in understanding the processes of economic and social development the accumulation of human capital and the expansion of human capability the former concentrates on the agency of human beings through skill and knowledge as well as effort in augmenting production possibilities the latter focuses on the ability of human beings to lead lives they have reason to value and to enhance the substantive choices they have the two perspectives cannot but be related since both are concerned with the role of human beings and in particular with the actual abilities that they achieve and acquire given her personal characteristics social background economic circumstances etc a person has the ability to do or be certain things that she has reason to value the reason for valuation can be direct the functioning involved may directly enrich her life such as being well nourished or being healthy or indirect the functioning involved may contribute to further production or command a price in the market the human capital perspective can in principle be defined very broadly to cover both types of valuation but it is typically defined by convention primarily in terms of indirect value human qualities that can be employed as capital in production in the way physical capital is in this sense the narrower view of human capital approach fits into the more inclusive perspective of human capability which can cover both direct and indirect consequences of human abilities consider an example if education makes a person more efficient in commodity production then this is clearly an enhancement of human capital this can add to the value of production in the economy and also to the income of the person who has been educated but even with the same level of income a person may benefit from education in reading communicating arguing in being able to choose in a more informed way in being taken more seriously by others and so on the benefits of education thus exceeds its role as human capital in commodity production the broader human capability perspective would record and value these additional roles the two perspectives are thus closely related but distinct the significant transformation that has occurred in recent years in giving greater recognition to the role of human capital is helpful for understanding the relevance of the capability perspective if a person can become more productive in making commodities through better education better health and so on it is not unnatural to expect that she can also directly achieve more and have the freedom to achieve more in leading her life both perspectives put humanity at the center of attention altogether this involves to a great extent a return to an integrated approach to economic and social development championed particularly by adam smith both in the wealth of nations and in the theory of moral sentiments in analysing the determination of production possibilities smith emphasized the role education as well as division of labor learning by doing and skill formation the development of human capability in leading a worthwhile life as well as in being more productive is quite central to smith s analysis of the wealth of nations indeed adam smith s belief in the power of education and learning was peculiarly strong regarding the debate that continues today on the respective roles of nature and nurture smith was an uncompromising nurturist and this fitted in with his massive confidence in the improvability of human capabilities

economics and the debate about preservation of species crop varieties and genetic diversity the paper reviews and outlines criteria that have been suggested for determining whether or not to save a species for extinction priorities as set out in the world conservation strategy cost benefit analysis and the safe minimum standard approach are given particular consideration the different criteria also are compared assuming that there is an absolute upper constraint on the amount of resources available for the conservation of species there is some discussion of whether the reduction in available crop varieties is adding to or reducing the instability of crop yields it is claimed that relative variability appears to be falling but there may be an increasing risk of non sustainability the importance of the burden of proof in the conservation versus non conservation debate is stressed and it is suggested that recent economic thought has swung more towards the view that the burden of proof should rest on those seeking to carry out activities which may extinguish a species

confronting the coffee crisis can fair trade organic and specialty coffees reduce small scale farmer vulnerability in northern nicaragua summary this paper links changing global coffee markets to opportunities and vulnerabilities for sustaining small scale farmer livelihoods in northern nicaragua changing governance structures corporate concentration oversupply interchangeable commodity grade beans and low farm gate prices characterize the crisis in conventional coffee markets in contrast certified fair trade and organic are two alternative forms of specialty coffee trade and production that may offer opportunities for small scale producers a research team surveyed 228 farmers to measure the impact of sales on organic and fair trade markets the results suggest that participation in organic and fair trade networks reduces farmers livelihood vulnerability 2004 elsevier ltd all rights reserved

is bioprospecting a viable strategy for conserving tropical ecosystems many prominent scientists avidly advocate bio prospecting the systematic search for new com mercial applications for biota especially hithertounstudied species as a mechanism for inducingtropical biodiversity conservation by making itcommercially attractive wilson 1992 reid et al 1993 paho 1996 weiss and eisner 1998 bio prospecting s premise is that nature contains hid den assets of potentially huge yet unknownmagnitude to humankind that can motivate andeven nance biodiversity conservation in the trop ics this undiscovered genetic or biochemical in formation is commonly framed in the context ofpotential improvements in medicine or food thusde ning a massive global population of potentialbene ciaries it is further argued that bioprospect ing can affect social and economic development indeveloping countries by rewarding biota rich butincome poor tropical communities that preserveand wisely manage their genetic resources thepremise of bioprospecting coupled with the claimthat practically all of humankind stands tobene t and perhaps most especially the poorestof the poor naturally leads to an urgent desire toconserve tropical biodiversity in order to enablediscovery extraction and value adding transfor mation of tropical biota speci cally it is claimed that bioprospectingstimulates conservation through two mechanisms first bioprospecting rms should be willing topay to preserve biodiversity for its innovationoption value since they stand to reap direct nan cial bene ts from any marketable discoveries sec ond conditional on an increase in life sciences rms willingness to pay for conservation localinhabitants and landholders valuation of biodi versity will change to the extent that they asstewards over biodiverse habitats are compen sated for their contribution to bioprospecting ac tivities to date most attention with respect to

deposit insurance and wealth effects the value of being too big to fail this paper investigates the effect on bank equity values of the comptroller of the currency s announcement that some banks were too big to fail and that for those banks total deposit insurance would be provided using an event study methodology we find positive wealth effects accruing to tbtf banks with corresponding negative effects accruing to non included banks we demonstrate that the magnitude of these effects differed with bank solvency and size we also show that the policy to which the market reacted was that suggested by the wall street journal and not that actually intended by the comptroller the role of deposit insurance has become a topic of increasing debate advocates argue that by removing the incentive to run deposit insurance protects individual financial institutions from instability in the intermediation process thereby providing stability to the financial system as a whole 1 the recent rise in bank failures and the concomitant crises in the s l industry however demonstrate that this stability is not guaranteed moreover critics note that deposit insurance may introduce incentive problems and wealth effects into the financial system both of which can impede the effective functioning of any deposit insurance system these problems have prompted concern about the structure of the current deposit insurance system and have led to numerous proposals regarding its restructuring 2 this paper investigates one aspect of this debate by analyzing the effect on bank equity values of the policy decision to insure completely some banks but not others specifically in september 1984 the comptroller of the currency testified before congress that some banks were simply too big to fail tbtf and that for those banks total deposit insurance would be provided while not explicitly naming the banks the comptroller admitted that this policy would apply to the eleven largest banks using an event study methodology we analyze