estimating the impact of currency unions on trade solving the glick and rose puzzle does leaving a currency union reduce international trade this paper uses a historical approach to re examine the puzzling large apparent impact of currency unions on trade i find that the early time series estimates were driven by the gradual decaying of colonial trade ties and other major geopolitical factors including warfare communist takeovers and ethnic cleansing episodes my methodology which carries lessons for other uses of gravity equations in policy analysis yields point estimates of currency unions on trade that are not statistically distinct from zero

to float or to fix evidence on the impact of exchange rate regimes on growth we study the relationship between exchange rate regimes and economic growth for a sample of 183 countries over the post bretton woods period using a new de facto classification of regimes based on the actual behavior of the relevant macroeconomic variables in contrast with previous studies we find that for developing countries less flexible exchange rate regimes are associated with slower growth as well as with greater output volatility for industrial countries regimes do not appear to have any significant impact on growth the results are robust to endogeneity corrections and a number of alternative specifications borrowed from the growth literature

will business cycles in the euro area converge a critical survey of empirical research this survey of business cycle synchronization in the european monetary union focuses on two issues have business cycles become more similar and which factors drive business cycle synchronization we conclude that business cycles in the euro area have gone through periods of both convergence and divergence still there is quite some evidence that during the 1990s business cycle synchronization in the euro area has increased higher trade intensity is found to lead to more synchronization but the point estimates vary widely the evidence for other factors affecting business cycle synchronization is very mixed

the real effects of financial integration abstract this paper shows how correlations in gdp fluctuations rise with financial integration finance serves to increase international correlations in both consumption and gdp fluctuations which explains the persistent gap between the two in the data a quantity puzzle the positive association between financial integration and gdp correlation constitutes a puzzle as theory suggests a negative relation if anything nevertheless it prevails in the data even after the effects of finance on trade and specialization are accounted for

the vcg auction in theory and practice abstract we describe two auction forms for search engine advertising and present two simple theoretical results concerning i the estimation of click through rates and ii how to adjust the auctions for broad match search we also describe some of the practical issues involved in implementing a vcg auction

revealed preference and its applications this note contains a short history of my work on the foundations of revealed preference emphasising the intellectual influence of sydney afriat i also present a few novel applications of revealed preference analysis drawn from some areas of applied economics

are business cycles asymmetric some european evidence economic thought has often regarded business cycles as asymmetric this study examines the existence of asymmetries over the business cycle in seven european countries france germany ireland italy luxembourg the netherlands and the united kingdom to analyse this issue industrial production in these countries from 1957 to 1998 is examined and quarterly contractions and expansions in this variable are compared the results obtained with both parametric and non parametric methods allow the existence of asymmetries in these countries to be questioned

trade finance specialization and synchronization i investigate the determinants of business cycle synchronization across regions the linkages between trade in goods financial openness specialization and business cycle synchronization are evaluated in the context of a system of simultaneous equations the main results are as follows i specialization patterns have a sizable effect on business cycles most of this effect is independent of trade or financial policy but directly reflects differences in gdp per capita ii a variety of measures of financial integration suggest that economic regions with strong financial links are significantly more synchronized even though they also tend to be more specialized iii the estimated role of trade is closer to that implied by existing models once intra industry trade is held constant the results obtain in a variety of data sets measurement strategies and specifications they relate to a recent strand of international business cycle models with incomplete markets and transport costs and on the empir

some models for estimating technical and scale inefficiencies in data envelopment analysis in management contexts mathematical programming is usually used to evaluate a collection of possible alternative courses of action en route to selecting one which is best in this capacity mathematical programming serves as a planning aid to management data envelopment analysis reverses this role and employs mathematical programming to obtain ex post facto evaluations of the relative efficiency of management accomplishments however they may have been planned or executed mathematical programming is thereby extended for use as a tool for control and evaluation of past accomplishments as well as a tool to aid in planning future activities the ccr ratio form introduced by charnes cooper and rhodes as part of their data envelopment analysis approach comprehends both technical and scale inefficiencies via the optimal value of the ratio form as obtained directly from the data without requiring a priori specification of weights and or explicit delineation of assumed functional forms of relations between inputs and outputs a separation into technical and scale efficiencies is accomplished by the methods developed in this paper without altering the latter conditions for use of dea directly on observational data technical inefficiencies are identified with failures to achieve best possible output levels and or usage of excessive amounts of inputs methods for identifying and correcting the magnitudes of these inefficiencies as supplied in prior work are illustrated in the present paper a new separate variable is introduced which makes it possible to determine whether operations were conducted in regions of increasing constant or decreasing returns to scale in multiple input and multiple output situations the results are discussed and related not only to classical single output economics but also to more modern versions of economics which are identified with contestable market theories

internet advertising and the generalized second price auction selling billions of dollars worth of keywords we investigate the generalized second price gsp auction a new mechanism used by search engines to sell online advertising although gsp looks similar to the vickrey clarke groves vcg mechanism its properties are very different unlike the vcg mechanism gsp generally does not have an equilibrium in dominant strategies and truth telling is not an equilibrium of gsp to analyze the properties of gsp we describe the generalized english auction that corresponds to gsp and show that it has a unique equilibrium this is an ex post equilibrium with the same payoffs to all players as the dominant strategy equilibrium of vcg

mean field equilibria of dynamic auctions with learning we study learning in a dynamic setting where identical copies of a good are sold over time through a sequence of second price auctions each agent in the market has an unknown independent private valuation that determines the distribution of the reward she obtains from the good for example in sponsored search settings advertisers may initially be unsure of the value of a click though the induced dynamic game is complex we simplify analysis of the market using an approximation methodology known as mean field equilibrium mfe the methodology assumes that agents optimize only with respect to long run average estimates of the distribution of other players bids we show a remarkable fact in a mean field equilibrium the agent has an optimal strategy where she bids truthfully according to a conjoint valuation the conjoint valuation is the sum of her current expected valuation together with an overbid amount that is exactly the expected marginal benefit of one additional observation about her true pri

online ad auctions i describe how search engines sell ad space using an auction i analyze advertiser behavior in this context using elementary price theory and derive a simple way to estimate the producer surplus generated by online search advertising it appears that the estimated value of online advertising tends to be between 2 and 2 3 times advertising expenditures jel d44 auctions d21 firm behavior

intra industry trade and business cycles in asean a new resolve for both increased economic integration and monetary and exchange rate cooperation has started to emerge in the association of southeast asian nations asean especially since the 1997 1998 asian financial crisis according to the optimum currency area theory the degree of trade integration is one of the most important criteria for joining a currency union the large increase in intra asean trade in recent years raises the question of whether the asean countries are becoming better prepared to form a currency union this article sets to test whether the recorded increase in intra asean trade is leading the asean members to closer economic integration and thus to better satisfy the criteria for a common currency two separate models are estimated for that purpose first a variation of the model of frankel and rose 1997 was estimated for the asean members next a new panel data methodology was conducted the results with our own model were very significant and robust when four of the ase

borders and business cycles abstract we document that business cycles of u s census regions are substantially more synchronized than those of european countries data from regions within european countries confirm a european border effect within country correlations are substantially larger than cross country correlations these results continue to hold after controlling for exogenous factors such as distance and size we consider the role of four factors that have received attention in the debate about emu sectoral specialization the level of trade monetary policy and fiscal policy we find that the lower level of trade between european countries explains most of the observed border effect

financial integration gdp correlation and the endogeneity of optimum currency areas the paper analyses the relationship between trade financial integration and business cycle synchronization in the euro area the introduction of the euro has had a noticeable impact on european financial markets evidence that capital market integration exerts a positive effect on output correlation has two major implications first it corroborates the hypothesis of the endogeneity of optimum currency areas whereby after joining a monetary union countries better meet standard oca criteria second it provides european policy makers with yet another reason to pursue financial integration in the euro area and in prospective members as well

measuring super efficiency in dea in the presence of infeasibility super efficiency data envelopment analysis dea model is obtained when a decision making unit dmu under evaluation is excluded from the reference set because of the possible infeasibility of super efficiency dea model the use of super efficiency dea model has been restricted to the situations where constant returns to scale crs are assumed it is shown that one of the input oriented and output oriented super efficiency dea models must be feasible for a any efficient dmu under evaluation if the variable returns to scale vrs frontier consists of increasing constant and decreasing returns to scale dmus we use both input and output oriented super efficiency models to fully characterize the super efficiency when super efficiency is used as an efficiency stability measure infeasibility means the highest super efficiency stability if super efficiency is interpreted as input saving or output surplus achieved by a specific efficient dmu infeasibility does not necessary mean the highest super efficiency

games of monetary and fiscal interactions in the emu abstract this paper constructs various models of the emu and ecb when member countries have different objectives voting in pursuit of national interest can yield moderate and stable inflation the metaphor of walsh type contracts implements a monetary policy rule that averages the member countries most preferred rules in a repeated relationship where a country suffering a large adverse shock can use political bargaining to subvert the ecb s commitment the optimal rule should incorporate some flexibility to forestall that finally freedom of national fiscal policies undermines the ecb s monetary commitment this may justify fiscal constraints like the stability and growth pact

transmission of business cycle shocks between the us and the euro area we analyse the transmission of structural shocks between the us and the euro area within a two country vector autoregressive var framework for that purpose we simultaneously identify cost push demand and monetary policy shocks for both countries using sign restrictions our results show that domestic shocks explain the largest share of the forecast error variances for gross domestic product gdp consumer prices and interest rate in both countries in the short run whilst spillovers from the other country and global factors gain importance in the medium run the strength of the shock transmission between the two countries is quite symmetric our approach to the identification of structural shocks allows us to construct confidence bands that account both for estimation and identification uncertainty we find impulse responses to domestic shocks to be significant while spillovers across countries are insignificant

a bi objective weighted model for improving the discrimination power in mcdea lack of discrimination power and poor weight dispersion remain major issues in data envelopment analysis dea since the initial multiple criteria dea mcdea model developed in the late 1990s only goal programming approaches that is the gpdea ccr and gpdea bcc were introduced for solving the said problems in a multi objective framework we found gpdea models to be invalid and demonstrate that our proposed bi objective multiple criteria dea bio mcdea outperforms the gpdea models in the aspects of discrimination power and weight dispersion as well as requiring less computational codes an application of energy dependency among 25 european union member countries is further used to describe the efficacy of our approach

business cycle comovement in the g 7 common shocks or common transmission mechanisms what are the sources of macroeconomic comovement among g 7 countries two main candidate explanations may be singled out common shocks and common transmission mechanisms in the article it is shown that they are complementary rather than alternative explanations by means of a large scale factor vector autoregressive fvar model allowing for full economic and statistical identification of all global and idiosyncratic shocks it is found that both common disturbances and common transmission mechanisms of global and country specific shocks account for business cycle comovement in the g 7 countries moreover spillover effects of foreign idiosyncratic disturbances seem to be a less important factor than the common transmission of global or domestic shocks in the determination of international macro economic comovements

computer mediated transactions every now and then a set of technologies becomes available that sets off a period of combinatorial innovation think of standardized mechanical parts in the 1800s the gasoline engine in the early 1900s electronics in the 1920s integrated circuits in the 1970s and the internet in the last decade or so the component parts of these technologies can be combined and recombined by innovators to create new devices and applications since these innovators are working in parallel with similar components it is common to see simultaneous invention there are many well known examples such as the electric light the airplane the automobile and the telephone many scholars have described such periods of innovation using terms such as recombinant growth general purpose technologies cumulative synthesis and clusters of innovation the internet and the web are wonderful examples of combinatorial innovation in the last 15 years we have seen a huge proliferation of web applications all built from a basic set of component technologies the internet itself was a rather unlikely innovation i like to describe it as a lab experiment that got loose since the internet arose from the research community rather than the private sector it had no obvious business model other public computer networks such as aol compuserve and minitel generally used a subscription models but were centrally controlled and offered little scope for innovation at the user level the internet won out over these alternatives precisely because it offered a flexible set of component technologies which encouraged combinatorial innovation

trade creation and diversion revisited accounting for model uncertainty and natural trading partner effects summary the effect of preferential trade agreements ptas on trade flows is subject to model uncertainty stemming from the diverse and even contradictory effects suggested by the theoretical pta literature the existing empirical literature has produced remarkably disparate results and the wide variety of empirical approaches reflects the uncertainty about the correct set of explanatory variables that ought to be included in the analysis to account for the model uncertainty that surrounds the validity of the competing pta theories we introduce bayesian model averaging bma to the pta literature statistical theory shows that bma successfully incorporates model uncertainty in linear regression analysis by minimizing the mean squared error and by generating predictive distributions with optimal predictive performance once model uncertainty is addressed as part of the empirical strategy we find strong evidence of trade creation trade diversion and open bloc effects our results are robust to a range of alternative empirical specifications proposed by the recent pta literature copyright 2010 john wiley sons ltd

one money one market the effect of common currencies on trade currency unions their dramatic effect on international trade a gravity model is used to assess the separate effects of exchange rate volatility and currency unions on international trade the panel data bilateral observations for five years during 1970 90 covering 186 countries includes 300 observations in which both countries use the same currency i find a large positive effect of a currency union on international trade and a small negative effect of exchange rate volatility even after controlling for a host of features including the endogenous nature of the exchange rate regime these effects statistically significant imply that two countries sharing the same currency trade three times as much as they would with different currencies currency unions like the european emu may thus lead to a large increase in international trade with all that that entails andrew rose

fiscal policy and monetary integration in europe fiscal policy economists policy makers and the media often argue that the maastricht treaty and the stability and growth pact make it difficult for governments of emu countries to stabilize their economies with appropriate fiscal policy and to provide adequate public investment our empirical analysis offers little support to this view discretionary budget deficits have actually become more counter cyclical in emu countries after the maastricht treaty as well as in the other eu and non eu industrialized countries we study and while public investment has declined recently in emu countries a similar tendency is apparent in other countries and started well before the maastricht treaty was signed jordi gali and roberto perotti

position effects in search advertising and their moderators a regression discontinuity approach we investigate the causal effect of position in search engine advertising listings on outcomes such as click through rates and sales orders because positions are determined through an auction there are significant selection issues in measuring position effects a simple mean comparison of outcomes at two positions is likely to be biased due to these selection issues additionally experimentation is rendered difficult in this situation by competitors bidding behavior which induces selection biases that cannot be eliminated by randomizing the bids for the focal advertiser econometric approaches to address the selection are rendered infeasible due to the difficulty of finding suitable instruments in this context we show that a regression discontinuity rd approach is feasible to measure causal effects in this important context we apply the approach to a large and unique data set of daily observations containing information on a focal advertiser as well as its major competitors our rd estimates demonstrate that there are significant selection biases in the more naive estimates while a mean comparison of outcomes across positions would indicate very large position effects we find that our rd estimates of these effects are much smaller and exist only in some of the positions we further investigate moderators of these effects position effects are stronger when the advertiser is smaller and when the consumer has low prior experience with the keyword for the advertiser they are weaker when the keyword phrase has specific brand or product information when the ad copy is more specific as in exact matching options and on weekends compared to weekdays

global business cycles convergence or decoupling we analyze the evolution of the degree of global cyclical interdependence over the period 1960 2008 using a dynamic factor model we decompose macroeconomic fluctuations in output consumption and investment into a global factor factors specific to country groups and country specific factors we find that during 1985 2008 there is some convergence of business cycle fluctuations among industrial economies and among emerging market economies surprisingly there is a concomitant decline in the relative importance of the global factor we conclude that there is evidence of business cycle convergence within each of these two groups of countries but divergence or decoupling between them

the decoupling of emerging economies theoretical and empirical puzzle with the growing importance of the emerging economies ees in the international scene a lively debate has begun on whether the national economic cycles are converging or the cycles of ees and advanced economies aes are becoming disconnected the so called hypothesis of decoupling of ees from the aes given the important practical implications that decoupling could have for example on the definition of national and international economic policies and on business strategies aimed at investment diversification and risk management the question kindles not only the interest of academics but also policymakers and practitioners are very interested in the issue the decoupling question has been long debated in different circles and from different points of view this survey aims to retrace the steps of this debate and to provide some suggestions for future empirical researches

long run growth and volatility which source really matters the aim of the article is to analyse the relationship between long run growth and business cycle volatility in particular the main purpose of this article is to identify which source of volatility is most detrimental to growth using cross country data from 1970 to 2000 and several indicators of volatility such as inflation exchange rate government expenditure output and investment volatility this article shows that although all these measures of volatility are remarkably harmful for growth business cycle investment volatility is the main source that hampers long run growth this relation is robust to different measures of business cycle and to different sub samples of countries

trade and business cycle synchronization in oecd countries a re examination this paper re examines the relationship between trade intensity and business cycle synchronization for 21 oecd countries in the period 1970 2003 instead of using instrumental variables we estimate a multivariate model including variables capturing specialization and similarity of economic policies we confirm that trade intensity affects synchronization but the effect is much smaller than previously reported other factors like specialization and convergence in monetary and fiscal policies have a similar impact on business cycle synchronization as trade intensity the effect of trade on synchronization is not driven by outliers however the impact of trade on synchronization is not robust across deciles c 2007 elsevier b v all rights reserved

exporting recessions international links and the business cycle abstract empirical evidence of decoupling typically focuses on declining business cycle correlations at low frequencies at higher frequencies business cycles strongly co move during recessions but are largely independent during non recessionary periods

how does globalization affect the synchronization of business cycles this paper examines the impact of rising trade and financial integration on international business cycle comovement among a large group of industrial and developing countries the results provide at best limited support for the conventional wisdom that globalization has increased the degree of synchronization of business cycles the evidence that trade and financial integration enhance global spillovers of macroeconomic fluctuations is mostly limited to industrial countries one striking result is that on average cross country consumption correlations have not increased in the 1990s precisely when financial integration would have been expected to result in better risk sharing opportunities especially for developing countries this abstract was borrowed from another version of this item

super efficiency dea in the presence of infeasibility it is well known that super efficiency data envelopment analysis dea approach can be infeasible under the condition of variable returns to scale vrs by extending of the work of chen 2005 the current study develops a two stage process for calculating super efficiency scores regardless whether the standard vrs super efficiency mode is feasible or not the proposed approach examines whether the standard vrs super efficiency dea model is infeasible when the model is feasible our approach yields super efficiency scores that are identical to those arising from the original model for efficient dmus that are infeasible under the super efficiency model our approach yields super efficiency scores that characterize input savings and or output surpluses the current study also shows that infeasibility may imply that an efficient dmu does not exhibit super efficiency in inputs or outputs when infeasibility occurs it can be necessary that i both inputs and outputs be decreased to reach the frontier formed by the remaining dmus under the input orientation and ii both inputs and outputs be increased to reach the frontier formed by the remaining dmus under the output orientation the newly developed approach is illustrated with numerical examples

distance language religion and the law of one price evidence from canada and nigeria we examine the impact of physical distance language and religion on law of one price lop deviations across interwar canadian and modern nigerian cities the data comprise monthly average retail prices for narrowly defined goods collected by national statistical agencies we find that differences in the fraction of the city population sharing a common language and religion have a significant impact on lop deviations the impact of language differences is consistent with a recently developed theory in which both trade costs and differences in signal noise ratios contribute to lop deviations

clubmed cyclical fluctuations in the mediterranean basin we investigate the similarities of macroeconomic fluctuations in the mediterranean basin and their convergence a model with three geo political indicators covering the west the east and the mena portions of the mediterranean characterizes well the historical experience since the early 1980 convergence and divergence coexist in the region and are reversible except for the west domestic cyclical fluctuations are still due to national and idiosyncratic causes the outlook for the next few years looks rosier for the mena and the east blocks than for the west

exchange rate regimes and international trade evidence from the classical gold standard era in this paper we show that the spread of the classical gold standard in the late nineteenth century increased international trade flows this positive effect was compounded whenever a group of countries formed a monetary union applying the gravity model of trade to more than 1 100 country pairs during the 1870 1910 period we find that two countries on gold would trade 60 percent more with each other than with countries on a different monetary standard moreover a monetary union would more than double bilateral trade flows our findings are relevant for current discussions on alternative monetary arrangements for the twenty first century

international spillovers in macrofinancial linkages and the decoupling phenomenon abstract this paper contributes to the debate on the decoupling of emerging economies ees from advanced economies aes by measuring how the resilience of ees to external shocks i e shocks spreading from aes has changed over time and whether ees are relatively more vulnerable to real or financial external shocks a time varying panel var model with factorisation of the coefficients was used to perform counterfactual experiments over a period of about 30 years for a large sample of countries allowing for time varying coefficients permitted the decoupling phenomenon to be examined as a slow moving evolution process over a long time rather than as a structural break at a specific moment the factorisation of coefficients allowed a large dynamic panel to be managed with interdependences across many countries consequently the experiment was more realistic in terms of evaluating the response of ees to shocks hitting the aes within a global framework the resilience of ees has improved over time however this increasing resilience was discontinuous over the approximately 30 year sample period tracing a wave path in the whole sample period the ees were relatively more vulnerable to credit shocks than to real ones this greater vulnerability increased over time and peaked in the last 5 years of the sample period

comparing predicted prices in auctions for online advertising abstract online publishers sell opportunities to show ads some advertisers pay only if their ad elicits a user response publishers estimate response rates for ads in order to estimate expected revenues from showing the ads then publishers select ads that maximize estimated expected revenue by taking a maximum among estimates publishers inadvertently select ads based on a combination of actual expected revenue and inaccurate estimation of expected revenue publishers can increase actual expected revenue by selecting ads to maximize a combination of estimated expected revenue and estimation accuracy

determinants of business cycle comovement a robust analysis abstract this paper investigates the determinants of business cycle comovement between countries our dataset includes over 100 countries both developed and developing we search for variables that are robust in explaining comovement using the approach of leamer amer econom rev 73 1983 31 variables considered are i bilateral trade between countries ii total trade in each country iii sectoral structure iv similarity in export and import baskets v factor endowments and vi gravity variables we find that bilateral trade is robust however two variables that the literature has argued are important for business cycles industrial structure and currency unions are found not to be robust

emu enlargement stabilization costs and insurance mechanisms this paper considers the determinants of the macroeconomic costs of joining emu for the new eu member sates and compares them with those of the emu members specifically we investigate the business cycle correlation between the candidate s economy and that of the euro area as a whole and the ability of insurance mechanisms and fiscal policies to smooth income fluctuations the results suggest that emu membership would not be costly for some countries cyprus hungary and malta but for other countries it could have relevant costs at least in the short run for some of these countries business cycles are not yet well synchronized with the euro area s business cycle and risk sharing mechanisms do not provide enough insurance against shocks

the nonlinear impact of currency unions on bilateral trade abstract most gravity model specifications assume that a currency union varies the level of bilateral trade between members by a constant proportion we demonstrate that a common currency also alters the slope of the relationship between bilateral trade and member country gdps

business cycles under monetary union a comparison of the eu and us reserve districts in the usa and the 15 countries that make up the eu the comparison is suggestive of what might be expected to emerge in the way of business cycle synchronization from a monetary union between the member states of the eu now simply non decimal denominations of the euro and the national central banks of the 11 are branches of the european system of central banks many prominent observers doubted that europe would ever reach this stage and many continue to believe that monetary union between such a large and dispar ate group of countries is fundamentally unsound a key element in the argu ments of many critics of emu is the degree of business cycle asynchronicity between the member states of the eu this paper contributes to the ongoing debate by documenting key differences and similarities between business cycles in the eu and business cycles in the 12 federal reserve districts in the united states the practice of looking to the us experience for insights into the problems and functioning of a monetary union has a long precedent in the literature on fixed exchange rates in general and in the literature on emu in particular for example in making an argument for fixed exchange rates rolnick and weber 1994 note that the usa can be viewed as having a system of fixed exchange rates between currencies issued by the 12 regional federal reserve banks they argue that the notes issued by the 12 banks are not strictly ident ical and that the difference between the notes creates the possibility that the united states could have a system of floating exchange rates among the 12 federal reserve districts 1 rolnick and weber go on to examine the features of the relationship among the 12 regional federal reserve banks that make a system of fixed exchange rates between them feasible in the process drawing lessons for how a monetary union among the countries of the eu might work the analysis in this paper complements earlier analyses in a number of ways the resurgence of interest in business cycle research over the past 20

super efficiency infeasibility and zero data in dea lee et al 2011 and chen and liang 2011 develop a data envelopment analysis dea model to address the infeasibility issue in super efficiency models in this paper we point out that their model is feasible when input data are positive but can be infeasible when some of input is zero their model is modified so that the new super efficiency dea model is always feasible when data are non negative note that zero data can make the super efficiency model under constant returns to scale crs infeasible our discussion is based upon variable returns to scale vrs and can be applied to crs super efficiency models

diversification consistent data envelopment analysis with general deviation measures abstract we propose new efficiency tests which are based on traditional dea models and take into account portfolio diversification the goal is to identify the investment opportunities that perform well without specifying our attitude to risk we use general deviation measures as the inputs and return measures as the outputs we discuss the choice of the set of investment opportunities including portfolios with limited number of assets we compare the optimal values efficiency scores of all proposed tests leading to the relations between the sets of efficient opportunities strength of the tests is then discussed we test the efficiency of 25 world financial indices using new dea models with cvar deviation measures

theoretical and experimental investigations of the performance of keyword auction mechanisms two keyword auction mechanisms the generalized second price auction gsp and the vickrey clarke groves mechanism vcg were compared theoretically and experimentally the former is widely used in practice the latter is not but it has a dominant strategy equilibrium where all participants bid their true values in the theoretical investigation by applying the locally envy free nash equilibrium to the vcg we found that the allocations are efficient and that upper and lower bounds of the auctioneer s revenue coincide in the two mechanisms a laboratory experiment in which the revenues and efficiencies were similar in both mechanisms supported this result

the strategy structure of two sided matching markets we study two sided markets in which agents are buyers and sellers or firms and workers or men and women the agents are to form partnerships which provide them with satisfaction and at the same time make monetary transfers e g salaries or dowries the core of this market game is shown to have a particularly nice structure so that precise answers can be given to questions concerning comparative statics and manipulability the idea of using walrasian equilibrium as a mechanism for making allocations with desirable properties of fairness and efficiency has been studied extensively the scheme involves having agents specify their supply and demand functions the competitive equilibria are then calculated and allocations are made accordingly in general this procedure may run into two difficulties first nonuniqueness if there are several equilibria there may be no fair way to decide which one should be implemented and second manipulability if there is only one equilibrium an informed agent may be able to influence it by suitably falsifying his demand data however as we will show here using the walrasian mechanism does work remarkably well for a certain class of important markets these are the matching markets of our title and they include markets for single items like houses where it is assumed that traders do not wish to acquire more than one item they also include labor markets in which it is desired to match workers with jobs at suitable salaries academic markets in which students are to be assigned to educational institutions marriage markets where men and women are matched through negotiating of dowries it turns out that in these markets both the problems of nonuniqueness and manipulability can be resolved in a

multi item auctions a collection of items is to be distributed among several bidders and each bidder is to receive at most one item assuming that the bidders place some monetary value on each of the items it has been shown that there is a unique vector of equilibrium prices that is optimal in a suitable sense for the bidders in this paper we describe two dynamic auction mechanisms one achieves this equilibrium and the other approximates it to any desired degree of accuracy

trade interdependence and the international business cycle a stochastic general equilibrium model of the world economy is developed to analyze the contribution of trade interdependence to international business cycles we test some of the implications of the model using data from ten major industrial countries and a variety of detrending techniques to calculate the cyclical component of output we find that the significance of trade in the transmission of economic disturbances across countries is not robust to the choice of the detrending method in general the role of trade interdependence is moderate and seem to have been stronger in the period before 1973

currency unions and international integration this paper characterizes the integration patterns of international currency unions such as the cfa franc zone we empirically explore different features of currency unions and compare them to countries with sovereign monies by examining the criteria for mundellos concept of an optimum currency area we find that members of currency unions are more integrated than countries with their own currencies for instance we find that currency union members have more trade and less volatile real exchange rates than countries with their own monies business cycles are more highly synchronized across currency union countries than across countries with sovereign monies

the myth of decoupling the decoupling hypothesis is the idea that business cycles in emerging market economies have become more independent from business cycles in advanced economies in recent years decoupling essentially amounts to a structural break in the degree of business cycle interdependence between the two groups of economies and it can be tested as such we develop an innovative measure of business cycle interdependence based on the euclidean distance available at the annual frequency which allows for a proper test for a structural break in a graphical setup we also make use of a standard econometric test both approaches point to the same conclusion there has been no decoupling in recent years if anything the degree of business cycle interdependence has become stronger

disaggregated trade and disaggregated currency unions a ranking of common currency effects andrew rose has long argued that a common currency has a large effect on increasing trade recently rose has called into question the reliability of this conclusion as new techniques have emerged for estimating gravity equations this article uses the sector specific gravity model developed by anderson and yotov 2010a to investigate if disaggregated trade can provide a reliable estimate of a common currency s effect disaggregating trade alone is insufficient to obtain a reliable estimate of a currency union regardless of econometric technique when the effect of a common currency on trade is uniform across all unions disaggregating the universe of currency unions with individual effects provides a reliable ranking of currency unions independent of estimation method by the effect that each union s currency has on increasing trade these rankings differ across sectors

out in the cold iceland s trade performance outside the european union and european monetary union although entering currency and customs unions involve both costs and benefits an increasing body of research is finding that the benefits in terms of international trade creation are remarkably large focusing simply on the european monetary union emu rather than the broad range of currency unions studied by other authors we find that the trade impact of emu is smaller but still substantial our findings suggest that the iceland s trade could increase by about 60 and that the trade to gdp ratio could rise by 12 percentage points should iceland join the european union and emu copyright 2006 oxford university press

business cycle synchronization in the emu this article asks whether the business cycles of the eu countries have become more or less synchronized after the introduction of the euro our findings show that all countries in our eu sample are better synchronized with the emu wide economy in the post emu period than they were before the euro we also show that this increase in synchronization is present in all components of aggregate demand as well as two supply side variables but it is more pronounced in the trade components imports and particularly exports it is also shown that the increase in trade within the emu area is at least partly responsible for the increase in cyclical synchronization