technical change external economies and the porter hypothesis abstract michael porter introduces the idea that environmental regulations may benefit affected firms this paper derives results consistent with porter s hypothesis by employing a general equilibrium framework with a large number of agents external economies of scale in production and discrete changes in technology the model shows that endogenous technical change makes porter s hypothesis feasible however a policy that produces results consistent with porter s hypothesis is not necessarily optimal

dynamics of dyadic competitive interaction in this study of firms entries into and exits from each other s markets we link research on multipoint competition to the emerging action oriented dyadic approach to interfirm rivalry by specifying market interdependencies between pairs of firms that condition their potential for rivalry over time our dynamic analysis of competitive interactions between pairs of commuter airlines in california reveals the idiosyncratic and asymmetric market microstructures that characterize dyadic competitive relationships and helps explain why firms grapple vigorously with some of their competitors while being passive toward others we show that there is an inverted u shaped relationship between firms rates of entry into and exit from each other s markets and the level of multimarket contact in competitor dyads we also show how this basic curvilinear effect varies from dyad to dyad as a function of relative levels of multimarket contact with competitors in other dyads and the relative sizes of competitors in a focal dyad copyright 1999 john wiley sons ltd

using generalized method of moments to test mean variance efficiency this paper develops tests of unconditional mean variance efflciency under weak distributional assumptions using a generalized method of moments framework these tests are potentially more robust than commonly employed tests which rely on the assumption that asset returns are normally distributed and temporarily i i d using returns for size based portfolios from 1926 to 1988 we show that the conclusion concerning the mean variance effilciency of market indexes can be sensitive to the test considered the application of multivariate statistical techniques in financial economics has become common practice in recent years much of the development has been in the area of testing asset pricing models the assumption that asset returns follow a time invariant multivariate normal distribution permits tests of restrictions on model parameters in a pooled time series cross section framework these tests can be interpreted as tests of the mean variance efficiency of a portfolio or combination of portfolios gibbons 1982 jobson and korkie 1982 stambaugh 1982 shanken 1985 1987 kandel and stambaugh 1987 mackinlay 1987 and gibbons ross and shanken 1989 are examples of work presenting multivariate tests of the capital asset pricing model connor and korajczyk 1988 and lehmann and modest 1988 present multivariate tests of the arbitrage pricing model breeden gibbons and litzenberger 1989 present multivariate tests of the consumption based capm although these papers assume the normality of asset returns little analysis has been conducted to understand the sensitivity of the inferences to violations of this assumption 2 3

tariffs versus quotas in the presence of imperfect competition and cross border externalities we consider trade policies intended to affect the production of a foreign monopolist that generates negative externalities we derive the optimal tariff and optimal import quota and examine which policy measure should be used to maximize domestic welfare we find that if the domestic government does not have full information on the foreign firm s production method and if cross border externalities exist import quotas are in some cases preferable to tariffs otherwise however tariffs are preferable to quotas jel classification f13 f18 droits de douane versus contingentements quand il y a concurrence imparfaite et effets externes trans frontaliers les auteurs examinent les politiques commerciales qui veulent affecter la production d un monopoleur etranger qui engendre des effets externes negatifs on definit le droit de douane optimal et le contingentement optimal des importations et on determine quelle politique devrait etre utilisee pour maximiser le niveau de bien etre au niveau national il appert que si le gouvernement national n a pas une information complete sur les methodes de production de la firme etrangere et si les effets externes traversent les frontieres un contingentement des importations est preferable dans certains cas a des droits de douanes autrement cependant les droits de douane constituent la solution preferable

trade liberalization environmental policy and welfare we analyze how trade liberalization affects environmental policies in the context of bilateral trade and imperfect competition instead of looking at the strategic distortions that trade introduces in environmental policies the focus of most existing studies we analyze how these distortions change in the face of a bilateral reduction in tariffs the incentives to distort environmental protection may be reduced by this move as a consequence environmental policies may be more stringent also welfare is likely and for some instruments certain to increase

carbon dioxide emissions and economic growth panel data evidence from developing countries in this paper we test the environment kuznet s curve ekc hypothesis for 43 developing countries we suggest examining the ekc hypothesis based on the short and long run income elasticities that is if the long run income elasticity is smaller than the short run income elasticity then it is evident that a country has reduced carbon dioxide emissions as its income has increased our empirical analysis based on individual countries suggests that jordan iraq kuwait yemen qatar the uae argentina mexico venezuela algeria kenya nigeria congo ghana and south africa approximately 35 per cent of the sample carbon dioxide emissions have fallen over the long run that is as these economies have grown emissions have fallen since the long run income elasticity is smaller than the short run elasticity we also examine the ekc hypothesis for panels of countries constructed on the basis of regional location using the panel cointegration and the panel long run estimation techniques we find that only for the middle eastern and south asian panels the income elasticity in the long run is smaller than the short run implying that carbon dioxide emission has fallen with a rise in income

multivariate tests of the zero beta capm abstract a cross sectional regression test csrt of the capm is developed and its connection to the hotelling t2 test of multivariate statistical analysis is explored algebraic relations between the csrt the likehood ratio test and the langrange multiplier test are derived and a useful small sample bound on the distribution function of the csrt is obtained an application of the csrt suggests that the crsp equally weighted index is inefficient but that the inefficiency is not explained by a firm size effect from february to december

protecting consumers through protection the role of tariff induced technology transfer abstract we consider a duopolistic trade model where a tariff induces the foreign firm to transfer its superior technology to the domestic rival contrary to the conventional wisdom such a tariff raises consumers surplus relative to the free trade situation we characterize the optimal tariff with and without precommitment on the part of the local government possibility of technology transfer reduces the optimal tariff rate compared to the no transfer situation

european environmental taxes and charges recent experience issues and trends abstract the use of environmental taxes and charges in oecd countries increased by over 50 between 1987 and 1994 while revenues raised by environmental taxes and charges remain small relative to overall taxation they comprise a rising proportion in most european countries several european countries have either undertaken or are considering systematic shifts in taxes away from labour and onto the use of environmental resources potential negative effects on competitiveness and regressive distributional effects are the major cause of concern with regard to the introduction of environmental taxes a number of ways of mitigating such effects exist and have been implemented

on multivariate tests of the capm abstract this paper evaluates the power of multivariate tests of the capital asset pricing model the results indicate that when employing an unspecified alternative hypothesis the ability of the tests to distinguish between the capm and other pricing models is poor an upper bound is derived for the distance the alternative distribution of the test statistic can be from the null distribution when the deviations from the capm are due to missing factors this upper bound explains the low power of the tests

a note on the geometry of shanken s csr t2 test for mean variance efficiency abstract shanken 1985 derives a test for the zero beta capital asset pricing model capm which as he points out is equivalent to a test of the mean variance efficiency of the market portfolio this note illustrates the geometry of shanken s test in the mean variance space

exchange rate exposure and industry characteristics evidence from canada japan and the usa abstract this paper examines industry level exchange rate exposures for canada japan and the usa measuring exposure by adding the change in the exchange rate to the domestic market model of industry portfolio returns some industries in all three countries display significant exposures moreover for each country the exchange rate is important for explaining industry returns at the economy wide level to explore whether exchange rate exposures are systematically linked to the activities of the industries we model exposure as a function of industry characteristics for all three countries the relation between exposure and industry characteristics is broadly consistent with economic theory jel f3

environmental policy and competitiveness the porter hypothesis and the composition of capital abstract the porter hypothesis suggests a win win situation in the sense that environmental policy improves both environment and competitiveness the suggestion received strong criticism from economists driven by the idea that if opportunities exist firms do not have to be triggered by an extra cost in this paper a model is developed which confirms this point but which also draws attention to some general mechanisms that relax the trade off considerably downsizing and modernization of firms subject to environmental policy will increase average productivity and will have positive effects on the marginal decrease of profits and environmental damage

toward a new conception of the environment competitiveness relationship accepting a fixed trade off between environmental regulation and competitiveness unnecessarily raises costs and slows down environmental progress studies finding high environmental compliance costs have traditionally focused on static cost impacts ignoring any offsetting productivity benefits from innovation they typically overestimated compliance costs neglected innovation offsets and disregarded the affected industry s initial competitiveness rather than simply adding to cost properly crafted environmental standards can trigger innovation offsets allowing companies to improve their resource productivity shifting the debate from pollution control to pollution prevention was a step forward it is now necessary to make the next step and focus on resource productivity

the likelihood ratio test statistic of mean variance efficiency without a riskless asset abstract the question whether a given porfolio is mean variance efficient is a basic problem of investment analysis mean variance efficiency is also the basis of the capital asset pricing model this paper presents the explicit form of the likelihood ratio test of the hypothesis that a given portfolio or a particular market index is ex ante mean variance efficient in the case where there is no riskless asset geometric relations are illustrated to provide intuition about the constrained maximum likelihood estimators and the test statistic and two simple economic interpretations of the test are given

the effects of openness trade orientation and human capital on total factor productivity abstract we study the effects of openness trade orientation and human capital on total factor productivity for a pooled sample of developed and developing countries total factor productivity emerges from a parsimonious specification of the aggregate production function potential determinants of total factor productivity include measures of openness trade orientation and human capital higher openness benefits total factor productivity outward oriented countries experience higher total factor productivity over and above the positive effect of openness human capital generally contributes positively to total factor productivity in poor countries however human capital interacts with openness to achieve a positive effect

potential performance and tests of portfolio efficiency abstract the potential performance of an asset set may be obtained by choosing the portfolio proportions to maximize the sharpe 1966 performance measure if a portfolio has a sharpe measure equivalent to the potential performance of the underlying set of assets then it is efficient multivariate statistical procedures for comparing potential performance and testing portfolio efficiency are developed and then evaluated using simulations two likelihood ratio statistics are then used to compare stock and bond indices against sets of 20 and 40 portfolios the procedures are also compared to the gibbons 1982 methodology for testing financial models

fee versus royalty licensing in a cournot duopoly model abstract this paper finds that royalty licensing can be superior to fixed fee licensing for the patent holding firm when the cost reducing innovation is non drastic the reason for this result is that the patent holding firm enjoys a cost advantage over the licensee under royalty licensing while the two firms compete on equal footing under fixed fee licensing

a theoretical foundation of the porter hypothesis abstract this letter shows that by reducing agency costs an environmental regulation may enhance pollution reducing innovation while at the same time increasing firms private benefit

multivariate proxies and asset pricing relations abstract a framework is developed in which inferences can be made about the validity of an equilibrium asset pricing relation even though the central aggregate in this relation is unobservable a multivariate proxy for the true market portfolio consisting of an equal weighted stock index and a long term government bond index is employed in an investigation of the sharpe lintner capm the empirical evidence suggests that we can reject the joint hypothesis that a capm is valid and b multiple correlation between the true market portfolio and proxy assets exceeds 0 7 connections to the equilibrium factor pricing literature are also explored

environmental regulation and technology transfers this paper analyzes the situation in which a national government introduces environmental regulations within the framework of an international duopoly with environmental regulations an environmental tax imposed by the government in the home country can induce a foreign firm with advanced abatement technology to license it to a domestic firm without this technology furthermore when the domestic firm s production technology is less efficient than that of the foreign firm the foreign firm may freely reveal its technology to the domestic firm these improvements through the voluntary transfer of technology imply that environmental regulations have positive impacts on innovation resume reglementation environnementale et transferts de technologie ce texte analyse le cas d un gouvernement national qui etablit des reglementations environnementales dans le cadre d un duopole international avec reglementations environnementales le gouvernement national impose une taxe environnementale au plan domestique qui peut induire une firme etrangere qui dispose d une technologie avancee qui reduit l impact environnemental a vendre une licence permettant d utiliser cette technologie a une firme domestique qui ne l a pas de plus quand la technologie de production de la firme domestique est moins efficace que celle de la firme etrangere la firme etrangere peut reveler sa technologie a la firme domestique ces ameliorations a travers les transferts volontaires de technologie impliquent que les reglementations environnementales ont des impacts positifs sur l innovation

history and social responses to environmental tax reform in the united kingdom abstract this paper gives a short history of fuel taxation and the climate change levy in the uk the research described was based around the use of interviews and focus groups to inform the assessment of social responses to etr policies and the development of improved designs for them interviews were conducted with selected policy makers and companies focus groups were conducted with quota samples of the general public the research shows that the problem that etr faces in terms of public acceptance is not so much outright hostility to environmental taxation as conceptual problems with the design similar conceptual problems were also found in the interviews with business people these can be summarised as lack of trust about use of the revenues difficulty in understanding the purpose of a tax shift and a desire for incentives for good behaviour as well as perceived penalties for bad behaviour

why environmental management may yield no regret pollution abatement options empirical evidence supports the existence of pollution abatement possibilities at negative costs the so called no regret options we provide a microeconomic rationale for the existence of such potential at the firm level an econometric application confirms that pollution abatement cost curves with no regret options are compatible with a standard production function as stated in our theoretical model c 2008 elsevier b v all rights reserved

fee versus royalty reconsidered for an outsider innovator in a cournot oligopoly royalty licensing could be superior to both fixed fee and auction the result depends on a simple fact that has been overlooked in the existing literature namely the number of licenses can take only integer values

additional evidence on integration in the canadian stock market this paper reexamines the integration of the canadian and u s stock markets in the 1977 86 period that is relatively free from capital controls the study employs both the capm and the apt frameworks under both models the evidence is consistent with segmentation in the 1977 81 subperiod but supports integration in the 1982 86 subperiod using the apt framework we also find that the canadian stocks interlisted on the u s exchanges and nasdaq are priced in an integrated market and segmentation is predominant for the non interlisted canadian stocks in a study using an international capm framework jorion and schwartz 1986 find strong evidence of segmentation in the pricing of canadian stocks relative to a north american market comprising the canadian and u s stock markets the rejection of integration holds for canadian stocks that are interlisted on the u s stock exchanges and nasdaq as well as for domestic canadian stocks that are listed only on the canadian stock exchanges their results are surprising since the canadian and u s economies are highly integrated and the structure and regulation of security markets in the two countries are similar as well the canadian stocks interlisted on the u s stock exchanges list under the same regulation as the domestic u s stocks thus ex ante we would expect the canadian and u s stock markets to be integrated especially for the interlisted stocks 1 this study reexamines the integration in the canadian market employing both the capm and the apt frameworks since tests of market integration are joint tests of a specified model and market integration a relevant question is whether the two models produce different inferences pertaining to the integration issue in addition we explore this issue in a period that is

a unified beta pricing theory abstract this paper derives ross s mutual fund separation theory and a new equilibrium version of ross s arbitrage pricing theory as special cases of a general theory the paper also reveals that the two theories are identical in their predictions of asset prices and portfolio returns the capital asset pricing model a restricted case of the mutual fund separation theory receives special treatment

a monte carlo investigation of the accuracy of multivariate capm tests abstract in a multivariate regression model relating individual returns to the market return capm implies non linear restrictions on the parameters several asymptotically valid tests of these restrictions have been suggested the existing monte carlo evidence shows that some of these tests are unreliable for reasonable sample sizes but does not indicate well which tests are reliable this paper reports the results of an extensive monte carlo experiment shanken s csr test and jobson and korkie s corrected likelihood ratio test are quite accurate in all cases we consider

a note on the behavior of stock returns around ex dates of stock distributions stock returns after the ex split date is significantly higher than the presplit volatility the increase in the standard deviation of daily returns is of the order of twenty eight to thirty five percent and persists for as long as a full year after the ex date even more interesting is their finding that there is no permanent change in the variance of returns at the announcement date they investigate several potential explanations for this aberration but are unable to find a satisfactory answer grinblatt masulis and titman 6 henceforth gmt examine the behavior of expected returns around announcement dates and exdates for stock distributions exceeding ten percent classifying stock distributions as either stock dividends split factors of twenty five percent or less or stock splits they conclude that return behavior differs across these two types of distributions with stock dividends exhibiting larger abnormal returns than splits this is interpreted by them as evidence in favor of the retained earnings hypothesis the dissimilar accounting treatment of these two types of stock distributions affects retained earnings in different ways and hence splits are not simply large stock dividends this paper extends the work of op to all types of stock distributions in section i postsplit variance is shown to be different from the presplit variance for small stock splits and stock dividends while small splits display an increase in volatility like large splits stock dividends are associated with a decrease in the volatility of returns this evidence also supports gmt s conclusions that stock splits and stock dividends are different types of events section ii investigates the volatility of returns for reverse splits and demonstrates that postsplit volatility decreases for these events this evidence is complementary to woolridge and chambers 9 findings that reverse splits are also associated with negative abnormal returns at their announcement and ex dates section iii concludes the paper

multivariate tests of asset pricing the comparative power of alternative statistics this paper examines estimation issues associated with multivariate tests of asset pricing two issues are considered 1 the constraint that the sample size n must be less than the time series t and 2 the relative effect on power of using the multivariate statistic versus a univariate counterpart we find that an alternative statistic that allows for large n does not dominate the usual portfolio tests more notably we find that the power of a simple diagonal statistic usually dominates the multivariate statistic for cases considered inthis study

tariffs licensing and market structure this paper challenges the conventional wisdom that exclusive owners of an advanced technology are always better off when producing as a monopolist than when competing against another firm competition against a less efficient firm weakens the power that a host country can exert on the incumbent in the form of its tariff policy we show that this gives a motive for a monopolist to license its technology to another foreign firm a host country gains more from increased competition if it can induce the foreign incumbent to transfer technology to the host country firm we show that the host country can do so by tariff commitment we also discuss the implications of bargaining under licensing and bertrand competition in the product market hence this paper qualifies and extends the recent work of kabiraj and marjit protecting consumers through protection the role of tariff induced technology transfer european economic review 47 113 124

international diversification through closed end country funds abstract the primary objectives of this paper are to assess the potential of closed end country funds cecfs as vehicles for achieving international diversification at home and to examine the effect of the closed end status of these funds on their investment characteristics the main findings are first cecfs exhibit significant exposure to the u s market factor and act more like u s securities than do their underlying assets second despite these characteristics cecfs retain significant exposure to their local home market factors and provide u s investors with substantial diversification benefits emerging market funds such as brazil mexico and taiwan receive large weights in optimal international portfolios comprised of cecfs implying that these funds can play a unique role in spanning the opportunity set for u s investors third performance evaluations indicate that our sample cecfs generally did not offer significant overseas alphas fourth fund value and net asset value are found to be co integrated for the majority of cecfs from north america and europe but not for those representing the asian emerging markets

environmental policy the porter hypothesis and the composition of capital effects of learning and technological progress abstract in this paper the effect of environmental policy on the composition of capital is investigated by allowing for nonlinearities it generalizes xepapadeas and de zeeuw j environ econ manage 37 1999 165 and determines scenarios in which their results do not carry over in particular we show that the way acquisition cost of investment decreases with the age of the capital stock is of crucial importance we also focus more explicitly on learning and technological progress among others we obtain that in the presence of learning implementing a stricter environmental policy with the aim to reach a certain target of emissions reduction has a stronger negative effect on industry profits which implies quite the opposite as to what is described by the porter hypothesis