generalized samuelson conditions and welfare theorems for nonsmooth economies abstract we give intuitive samuelson conditions for a very general class of economies smoothness and monotonicity are not required we provide necessary and sufficient conditions for all pareto efficient allocations including those on the boundary we prove that if all agents have a cheaper point the supporting prices fully decentralize the allocation we also show first and second welfare theorems as corollaries to the characterization of efficient allocations

globalization and the great u turn income inequality trends in 16 oecd countries the debate on the resurgence of income inequality in some advanced industrial societies has often focused on the impact of an increasingly integrated world economy typified by growing capital mobility heightened international competition and an increase in migration this study represents one of the first systematic cross national examinations of the role of globalization in the inequality u turn results indicate on the one hand that total inequality variation is principally affected by the percentage of the labor force in agriculture followed by the institutional factors union density and decommodification and only then by globalization on the other hand longitudinal variation in inequality while still dominated by the percentage of the labor force in agriculture is also principally affected by aspects of globalization such as southern import penetration and direct investment outflow and to a lesser extent by migration in other words globalization explains the longitudinal trend of inc

public goods in networks this paper considers incentives to provide goods that are non excludable along social or geographic links we find first that networks can lead to specialization in public good provision in every social network there is an equilibrium where some individuals contribute and others free ride in many networks this extreme is the only outcome second specialization can benefit society as a whole this outcome arises when contributors are linked collectively to many agents finally a new link increases access to public goods but reduces individual incentives to contribute hence overall welfare can be higher when there are holes in a network

foreign capital dependence and development a new direction scholars have long debated the impact of foreign investment on the economies of less developed countries many argue that foreign investment is beneficial for the host economy others argue just as forcefully that dependence on foreign capital is detrimental this study offers a new conceptualization of foreign capital dependence that may resolve this debate foreign investment concentration which is the proportion of a host country s foreign direct investment stocks owned by the single largest investing country the theory is that high investment concentration limits the autonomy of state and business elites to act in the long term interests of domestic growth in a series of cross national panel regression models of 39 less developed countries estimated at five year intervals from 1970 to 1995 the often cited negative effects of foreign capital penetration on growth in gnp per capita are dramatically reduced or entirely replaced when investment concentration and the related concepts of export commodity and trade partner concentrations are included in the analyses foreign investment concentration has a significant long term negative effect on growth that is strongest over the initial five year period and decreases over the next 15 years a similar effect is also found for the 1990 1997 period this structural aspect of capital dependence has a greater impact on development than does the overall level of foreign capital penetration

potential pitfalls for the purchasing power parity puzzle sampling and specification biases in mean reversion tests of the law of one price the ppp puzzle is based on empirical evidence that international price differences for individual goods loop or baskets of goods ppp appear highly persistent or even nonstationary the present consensus is these price differences have a half life that is of the order of five years at best and infinity at worst this seems unreasonable in a world where transportation and transaction costs appear so low as to encourage arbitrage and the convergence of price gaps over much shorter horizons typically days or weeks however current empirics rely on a particular choice of methodology involving i relatively low frequency monthly quarterly or annual data and ii a linear model specification in fact these methodological choices are not innocent and they can be shown to bias analysis towards findings of slow convergence and a random walk intuitively if we suspect that the actual adjustment horizon is of the order of days then monthly and annual data cannot be expected to reveal it if we suspect arbitrage costs are high enough to produce a substantial band of inaction then a linear model will fail to support convergence if the process spends considerable time random walking in that band thus when testing for ppp or loop model specification and data sampling should not proceed without consideration of the actual institutional context and logistical framework of markets

some consequences of temporal aggregation in empirical analysis i derive the generating mechanism of a temporally aggregated process when the disaggregated one belongs to the vector autoregressive integrated moving average class i then study the effects of temporal aggregation on a set of characteristics of usual interest such as exogeneity causality cointegration and common features an empirical example with canadian interest rates illustrates the main issues

real exchange rate adjustment in european transition countries abstract in single equation tests real exchange rates show mean reversion for nine of 10 central and eastern european transition countries for the period january 1993 to december 2005 because of the shift from controlled to market economies and accompanying crises failed policy regimes and changes in exchange rate regimes unit root tests for transition countries often require allowance for structural changes accounting for structural breaks gives substantially faster mean reversion speeds than those found for major industrialized countries these fast adjustment speeds are plausible transition countries had perhaps 10 years to make unprecedented adjustments required for accession to the european union a number of papers have applied non linear models to the central and eastern european countries this paper investigates four non linear models and compares them with piece wise linear break models the break models appear superior in detecting mean reversion for the central and eastern european transition countries

the purchasing power parity persistence paradigm abstract rogoff journal of economic literature 1996 34 647 668 describes the remarkable consensus of 3 5 year half lives of purchasing power parity deviations among studies using long horizon data these studies however focus on rejections of unit roots in real exchange rates and do not use appropriate techniques to measure persistence our half life estimates explicitly account for serial correlation sampling uncertainty and most importantly small sample bias calculating confidence intervals as well as point estimates for long horizon and post 1973 data we find that even though most of the point estimates lie within the 3 5 year range univariate methods provide virtually no information regarding the size of the half lives

ppp strikes back aggregation and the real exchange rate we show the importance of a dynamic aggregation bias in accounting for the ppp puzzle we prove that the aggregate real exchange rate is persistent because its components have heterogeneous dynamics established time series and panel methods fail to control for this using eurostat data we find that when heterogeneity is taken into account the estimated persistence of real exchange rates falls dramatically its half life for instance may fall to as low as eleven months significantly below the consensus view of three to five years

how puzzling is the ppp puzzle an alternative half life measure of convergence to ppp summary evidence of lengthy half lives for real exchange rates in the presence of a high degree of exchange rate volatility has been considered as one of the most puzzling empirical regularities in international macroeconomics this paper suggests that the measure of half life used in the literature might be problematic and proposes alternative measures with desirable properties their focus on the cumulative effects of the shocks distinguishes them from the measures used in the literature an empirical analysis of bilateral us dollar real exchange rates employing the alternative half life measure produces results consistent with theory and indicates that the ppp puzzle is less pronounced than initially thought copyright 2012 john wiley sons ltd

median unbiased estimation in df gls regressions and the ppp puzzle using median unbiased estimation recent research has questioned the validity of rogoff s remarkable consensus of 3 5 year half lives of deviations from ppp these half life estimates however are based on estimates from regressions where the resulting unit root test has low power we extend median unbiased estimation to the df gls regression of elliott rothenberg and stock 1996 we find that median unbiased estimation based on this regression has the potential to tighten confidence intervals for half lives using long horizon real exchange rate data we find that the typical lower bound of the confidence intervals for median unbiased half lives is just under 3 years thus while previous confidence intervals for half lives are consistent with virtually anything our tighter confidence intervals now rule out economic models with nominal rigidities as candidates for explaining the observed behavior of real exchange rates therefore while we obtain more information using efficient unit root tests on longer term data this information moves us away from solving the ppp puzzle

real exchange rate behavior the recent float from the perspective of the past two centuries using annual data spanning two centuries for dollar sterling and franc sterling real exchange rates we find strong evidence of mean reverting real exchange rate behavior using simple stationary autoregressive models estimated on prefloat data we easily outperform nonstationary real exchange rate models in dynamic forecasting exercises over the recent float such stationary univariate equations explain 60 80 percent of the in sample variation in real exchange rates although the degree of short run persistence may be high the econometric estimates imply a half life of shocks to the real exchange rate of about 6 years for dollar sterling and a little under 3 years for franc sterling

r d networks we develop a model of strategic networks that captures two distinctive features of interfirm collaboration bilateral agreements and nonexclusive relationships our analysis highlights the relationship between market competition firms incentives to invest in r d and the architecture of collaboration networks in the absence of firm rivalry the complete network where each firm collaborates with all others is uniquely stable industry profit maximizing and efficient by contrast under strong market rivalry the complete network is stable but intermediate levels of collaboration and asymmetric networks are more attractive from a collective viewpoint this suggests that competing firms may have excessive incentives to form collaborative links

why panel tests of purchasing power parity should allow for heterogeneous mean reversion recent studies of purchasing power parity ppp use panel tests that fail to take into account heterogeneity in the speed of mean reversion across real exchange rates in contrast to several other severe restrictions of panel models and tests of ppp the assumption of homogeneous mean reversion is still widely used and its consequences are virtually unexplored this paper analyzes the properties of homogeneous and heterogeneous panel unit root testing methodologies using monte carlo simulation we uncover important adverse properties of the panel approach that relies on homogeneous estimation and testing more specifically power functions are low and assume irregular shapes furthermore homogeneous estimates of the mean reversion parameters exhibit potentially large biases these properties can lead to misleading inferences on the validity of ppp our findings highlight the importance of allowing for heterogeneous estimation when testing for a unit root in panels of real exchange rates

the choice of numeraire currency in panel tests of purchasing power parity we investigate the implications of the choice of numeraire currency on panel tests of purchasing power parity under the current regime of flexible exchange rates by conducting panel unit root tests with twenty one different base currencies we show that the conditions necessary for numeraire irrelevancy are not supported empirically and that the choice of numeraire currency can and does matter for ppp the evidence of ppp is stronger for european than for non european base currencies distance between the countries and volatility of the exchange rates are the most important determinants of the results

the curious attraction of wagner s law wagner s law of increasing state activity has recently been subjected to intensive use of recondite econometric testing procedures an examination of the relevant articles reveals ignorance both of wagner s definition of state activity and of his insistence that he was not engaged in prediction consequently the omission of public enterprises contained in wagner s definition leads to a model misspecification and the object of testing his hypothesiss remains obscure

increasing evidence of purchasing power parity over the current float we conduct unit root tests of real exchange rates with the united states dollar and the german mark as base currencies using samples of data which begin in 1973 and end between 1982 and 1996 we find that as the sample is extended the evidence of ppp strengthens with panel but not univariate methods because of the sharp rise and fall of the dollar in the early 1980s rejections of the unit root null do not monotonically increase with the sample size the evidence of ppp is uniformly stronger when the mark is used as the base currency

does foreign capital harm poor nations new estimates based on dixon and boswell s measures of capital penetration l a s efforce de mesurer l impact economique de la penetration du capital et de l investissement etranger sur l economie des pays en voie de developpement il examine et critique le mode d evaluation de la production propose par w j dixon et t boswell il estime qu il convient de distinguer investissement local et investissement etranger il presente les differents types d interpretation et etudie un certain nombre de donnees collectees concernant le panama la jamaique le liberia la guinee et enfin trinidad et tobago il se demande d une part si l investissement local et preferable a l investissement etranger et d autre part si ce dernier appauvrit les pays en voie de developpement il s interroge sur le bien fonde de la theorie de la dependance

panel unit root tests of purchasing power parity for price indices abstract this paper adopts four panel unit root tests to evaluate ppp over the floating period for six different price indices results generally support ppp albeit the speeds of adjustment differ considerably between price indices and test procedures the degree of contemporaneous and serial correlation as well as heterogeneity of the series in the panel affect stationarity and the speed of mean reversion

boundary optima and the theory of public goods supply abstract this paper derives a generalized optimality condition that is valid for all boundary optima in an economy with many public goods and one private good this condition is then used to show that there is an open subset of pareto optima where samuelson s condition does not hold finally it is shown that allocation and distribution are inextricable at these optima even under conditions that guarantee independence of allocation and distribution at interior optima

price level convergence new evidence from u s cities abstract this paper tests the bilateral price level convergence among 52 u s cities at the good level by using a new econometric approach the estimated median half lives are far below the half lives found in the corresponding studies for the u s

temporal aggregation and purchasing power parity persistence this paper uses a unique new monthly us uk real exchange rate series for the january 1794 december 2009 period to reexamine the academic debate over purchasing power parity ppp the consensus view described by rogoff 1996 is that ppp holds in the long run but short run deviations are very persistent with half lives ranging from 3 to 5 years most of the literature using long time series relies on the annual data developed by lee 1976 and lothian and taylor 1996 which were both constructed from underlying higher frequency data sources estimates of purchasing power parity persistence using these series may therefore be subject to temporal aggregation bias we find evidence of aggregation bias which indicates the half life of ppp deviations has been overestimated in much of the previous literature we also find that estimates of the half lives are further reduced once we account for the harrod 1933 balassa 1964 samuelson 1964 effect the result of aggregation bias appears to be robust even when considering the case that real exchange rates exhibit nonlinear dynamics

revisiting the persistence of real exchange rates abstract in this paper we provide new and robust evidence that panel regressions significantly reduce the estimated half lives of real exchange rates in a sample of 21 countries these results are obtained under dynamic panel models that control for non purchasing power parity ppp equilibria small sample bias does not have a significant impact on half lives since the increase in the half life arising from the bias is more than compensated by the decrease of the half life due to the control of non ppp equilibria among the two sources of non ppp equilibria i e first the balassa samuelson effect and second smooth shifts in mean we find that under a heterogeneous panel model the first source results in a larger reduction of half lives

the long term effects of foreign investment dependence on economic growth 1940 1990 does dependence of a national economy on foreign investment promote economic growth or underdevelopment the recent exchanges between glenn firebaugh and william j dixon and terry boswell suggest the contentious nature of this debate this study analyzes models similar to those tested in previous research but with data from earlier time points to examine the long term effects of foreign capital penetration accumulated stocks of foreign capital gdp in 1938 have a short term five year positive effect on economic growth followed by a 20 year lagged negative effect on economic growth beginning in 1960 and lasting at least 30 years similar effects are found using a second indicator of foreign investment dependence debits on investment income for the 1950 90 period the international migration of capital has facilitated development of the world s natural resources and has been instrumental in transmitting the direct effects of the industrial revolution from area to area thereby it has helped to increase

exchange rate economics is always and everywhere controversial abstractthis article reviews the major developments in the recent literature on exchange rate economics it is argued that the link between the exchange rate and economic fundamentals is breaking new ground evidence indicates that alternative analytical frameworks such as the new open economy macroeconomics and exchange rate arrangements such as the euro have their theoretical and analytical elegance but are proving empirically very difficult to implement the role of methodological advances and alternative fundamental instruments such as world commodity prices is also highlighted

unbiased estimation of the half life to price index convergence among u s cities estimates of the half life to convergence of prices across a panel of cities are subject to bias from three potential sources inappropriate cross sectional aggregation of heterogeneous coefficients presence of lagged dependent variables in a model with individual fixed effects and time aggregation of commodity prices this paper finds no evidence of heterogeneity bias in annual cpi data for 17 u s cities from 1918 to 2006 but correcting for the nickell bias and time aggregation bias produces a half life of 7 5 years shorter than estimates from previous studies

forecasting exchange rates out of sample with panel methods and real time data abstract this paper evaluates out of sample exchange rate forecasting with purchasing power parity ppp and taylor rule fundamentals for 9 oecd countries vis a vis the u s dollar over the period from 1973 q1 to 2009 q1 at short and long horizons in contrast with previous work which reports forecasts using revised data i construct a quarterly real time dataset that incorporates only the information available to market participants when the forecasts were made using bootstrapped out of sample test statistics the exchange rate model with taylor rule fundamentals performs better at the one quarter horizon and panel estimation is not able to improve its performance the ppp model however forecasts better at the 16 quarter horizon and its performance increases in panel framework the results are in accord with previous research on ppp and taylor rule models

do panels help solve the purchasing power parity puzzle although rogoff described the remarkable consensus of 3 to 5 year half lives of purchasing power parity ppp deviations among studies using long horizon data recent works using panel methods with post 1973 data report shorter half lives of 2 to 2 5 years but these studies do not use appropriate techniques to measure persistence we extend median unbiased estimation methods to the panel context calculate both point estimates and confidence intervals and provide strong evidence confirming rogoff s original claim although panel regressions provide more information on the persistence of real exchange rate shocks than univariate regressions they do not help solve the ppp puzzle

boon or bane reassessing the productivity of foreign direct investment we assess the effects of foreign and domestic capital on economic growth using the latest data and better models of economic growth than those previously used we explicitly consider the role of human capital in the process of economic development we find no evidence that foreign direct investment harms the economic prospects of developing countries the flow of foreign capital from 1980 to 1991 spurred growth in gross domestic product per capita while the level of foreign stock or foreign penetration had no discernible effect indeed new foreign investment was more productive dollar for dollar than was capital from domestic sources previous suggestions that foreign investment flows are less beneficial than domestic ones were based on a misinterpretation moreover foreign direct investment stimulates investment from domestic sources consequently developing countries have no reason to eschew foreign capital as dependency theorists urge

multi country evidence on the behavior of purchasing power parity under the current float abstract using panel data for the united states and 22 other oecd countries for the current float this paper presents evidence that despite substantial short term perturbations purchasing power parity actually performed much better than commonly believed average rates of growth of real exchange rates over long horizons bear little relationship either to average rates of growth of nominal exchange rates or to average inflation differentials thus implying a close to one to one relation between average rates of growth of nominal exchange rates and average inflation differentials panel data variants of standard unit root tests suggest that the real exchange rates of these countries can be characterized as mean reverting

the common trend and transitory dynamics in real exchange rate fluctuations this study examines the behaviour of both common trend ct and transitory components of real exchange rate rer fluctuations under the current float the ct component is in most cases found to be sizeable albeit its relative importance can vary considerably across major currencies and its estimate can be sensitive to whether or not long run purchasing power parity ppp is imposed on the data further analysis suggests that both ct and transitory innovations are linked much more to interest rate changes than to productivity changes accordingly it is interest rate not productivity disturbances that drive the highly persistent rer

trade openness foreign direct investment and child labor summary the skeptics of globalization argue that increased trade openness and foreign direct investment induce developing countries to keep labor costs low for example by letting children work this article argues that there are good theoretical reasons why globalization might actually have the opposite effect we test this with various measures of child labor and provide the first analysis of foreign investment in addition to trade we present evidence that countries that are more open to trade and or have a higher stock of foreign direct investment also have a lower incidence of child labor this holds for the labor force participation rate of 10 14 year old children the secondary school nonattendance rate and a count measure of economic sectors with child labor incidence as the dependent variables globalization is associated with less not more child labor

a panel project on purchasing power parity mean reversion within and between countries abstract previous time series studies have shown evidence of mean reversion in real exchange rates deviations from purchasing power parity ppp appear to have half lives of approximately four years however the long samples required for statistical significance are unavailable for most currencies and are potentially inappropriate because of regime changes in this study we re examine deviations from ppp using a panel of 150 countries and 45 annual post wwii observations our panel shows strong evidence of mean reversion that is similar to that from long time series ppp deviations are eroded at a rate of approximately 15 annually i e their half life is around four years such findings can be masked in time series data but are relatively easy to find in cross sections

aggregation unit roots and the time series structure of manufacturing real wages the effects of both temporal and cross sectional aggregation on the estimated time series characteristics of manufacturing real wage data are examined the effects especially of temporal aggregation are found to be quite large and in accord with statistical theory the well known results of j altonji and o ashenfelter 1980 that real wages are a random walk and of c r nelson and c i plosser 1982 that real wages are an ima 1 1 process both seem to be entirely artifacts of temporal aggregation with the true models following processes that are much more complex and that display substantial cyclical behavior copyright 1992 by economics department of the university of pennsylvania and the osaka university institute of social and economic research association

understanding post euro law of one price deviations we put together a unique panel of thousands of good level prices before and after the euro to compare the determinants and understand the evolution of goods price dispersion across europe over time we find that tradeability and nontraded inputs play a significantly smaller role for cross country price dispersion after the adoption of the euro and for eurozone economies as compared to european union ones we then compare the distributions of law of one price lop deviations over time to understand how the degree of integration across european economies changed after the euro our tests reveal that the distributions after the euro are typically significantly different from those before consistent with a greater degree of integration utilizing our unique panel data set to trace the location of individual goods in the distribution of lop deviations we ask how the price advantage or disadvantage evident in these price distributions evolves over time and whether goods characteristics play a role for the persistence of these lop deviations lop deviations for these goods are highly correlated over 5 or 10 year horizons and correlations remain significantly high over longer horizons these correlations are greater for homogeneous as compared to differentiated goods and vary across countries finally for most of these european economies and goods price advantage is typically revealed to be more persistent than price disadvantage

the effects of social networks on employment and inequality we develop a model where agents obtain information about job opportunities through an explicitly modeled network of social contacts we show that employment is positively correlated across time and agents moreover unemployment exhibits duration dependence the probability of obtaining a job decreases in the length of time that an agent has been unemployed finally we examine inequality between two groups if staying in the labor market is costly and one group starts with a worse employment status then that group s drop out rate will be higher and their employment prospects will be persistently below that of the other group

independence of allocative efficiency from distribution in the theory of public goods when is the pareto optimal amount of public goods independent of income distribution subject to some regularity conditions the answer is when preferences of every individual i can be represented by a utility function of the form u x i y a y x i b i y where x i is i s consumption of private goods and y is the amount of public goods

income inequality democracy and public sector size this study synthesizes and tests explanations of how public sector size and democracy affect income inequality the results based on unbalanced panel data for 64 developing and developed countries

on the private provision of public goods on networks abstract this paper analyzes the private provision of public goods where consumers interact within a fixed network structure and may benefit only from their direct neighbors provisions we present a proof of the existence and uniqueness of a nash equilibrium for general networks and best reply functions in addition we investigate the neutrality result of warr 38 and bergstrom blume and varian 6 whereby consumers are able to undo the impact of income redistribution as well as public provision financed by lump sum taxes to this effect we show that the neutrality result has a limited scope of application beyond a special network architecture in the neighborhood of the set of contributors

searching for evidence of long run ppp from a post bretton woods panel separating the wheat from the chaff abstract this paper reexamines the issue of long run ppp using multiple panel tests in the framework of confirmatory analysis application of six panel tests under competing null hypotheses to the real exchange rates of 21 industrial countries yields seemingly contradictory evidence on the parity during the post bretton woods period regardless of numeraire currency four i 1 panel tests unanimously reject the null hypothesis in favor of long run ppp whereas two i 0 panel tests lend little support to the parity at conventional significance levels confirmatory analysis suggests that this puzzling result can be explained either by nonlinear dynamics of the real exchange rates or by a mixture of i 0 and i 1 series in the panel monte carlo experiments indicate that potential mix of i 0 and i 1 series is more relevant to the empirical finding the use of a sequential classification method sorts out six real exchange rates which exhibit most persistent deviations from long run equilibrium systematic behavior of these series can be characterized better by country specific factors than by observable macroeconomic variables

the panel purchasing power parity puzzle does long run purchasing power parity ppp hold over the post 1973 floating exchange rate period panel unit root tests provide evidence of ppp that increases with the number of observations the strengthening of the evidence however is highly cyclical when the dollar appreciates at the end of the sample the evidence of ppp strengthens and when it depreciates the evidence weakens while these patterns cannot be explained by the specifications that are normally used to model real exchange rates the strengthening but not the cyclical pattern can be explained by a specifi cation that incorporates ppp restricted structural change

growth effects of foreign and domestic investment over tha past few years numerous studies in sociology have concluded that foreign investment harms poor nations these studies have focused on the coefficient for foreign capital stock controlling for flow new investment and defying logic have inferred that a negative coefficient for stock reflects dependency effects that retard economic growth since capital stock is the denominator for investment rate the greater the stock the lower the investment rate for a given level of new investment hence the negative coefficient for capital stock found in dependency studies indicates a beneficial investment effect not a harmful effect this point is demonstrated by reanalysis of the data used in dependency studies in these data foreign investment spurs growth earlier analysts have concluded otherwise only because their conclusions have belied their findings

the samuelson condition and the lindahl scheme in networks abstract we study optimal provision of public goods in the network showing that the samuelson condition and the lindahl scheme can both be substantially extended to characterize the expenditure on such public goods couched in terms of the structure of the network the extended samuelson condition and lindahl scheme formulate precisely how the local publicness of a local public good fundamentally determines its optimal provision and the personalized price that the lindahl tax payer faces independence of the optimal allocation from the distribution of resources at interior samuelsonian solutions in the network generally fails to hold even for the bergstrom cornes preferences

unbiased estimation of the half life to ppp convergence in panel data three potential sources of bias introduce complications for panel data estimation of the half life of purchasing power parity deviations they are bias induced by inappropriate cross sectional aggregation of heterogeneous coefficients small sample estimation bias of dynamic lag coefficients and bias induced by time aggregation of commodity prices all of these biases have been addressed individually in the literature in this paper we address all three biases in arriving at our estimates using an annual panel data set of cpi based real exchange rates for 21 oecd countries from 1973 to 1998 we obtain a point estimate of the unbiased half life of 3 0 years with a 95 confidence interval of 2 3 4 2 years

liquidity creation through efficient m as a viable solution for vulnerable banking systems evidence from a stress test under a panel var methodology according to the cost efficiency liquidity creation hypothesis celch introduced in this paper a rise in a bank s cost efficiency level increases its liquidity creation by employing a novel stress test scenario under a panel var methodology the celch and the direction of causality between liquidity creation and cost efficiency are tested moreover using new measures of liquidity creation berger and bouwman 2009 the question of whether potential bank mergers and acquisitions m as can enhance liquidity creation and generate additional credit channels in the economy is addressed the robustness of potential consolidation scenarios are evaluated and compared through the use of new half life measures chortareas and kapetanios 2013 in line with celch the positive impact of cost efficiency on liquidity creation is shown the empirical evidence further suggests that potential consolidation activity can enhance the flow of credit in the economy bank shocks seem to have the most persistent effect on both liquidity creation and cost efficiency finally doubts are cast on the strategies followed by policy authorities regarding the recent wave of m as in the banking sector