the speed of the invisible hand abstract very little attention has been devoted to incorporating dynamic elements into empirical models of market structure and performance consequently there has been little progress in settling the issue of whether the market structure profits relationship is more than just a temporary phenomenon in this study an estimation equation is developed which allows for incomplete adjustment of past profits from expected future profits where expected profits depends on present and expected future changes in market structure the model is estimated pooling panel data across industries the findings indicate that adjustment to abnormal profits is relatively quick market share adjustments are non instantaneous and that inclusion of industry specific effects is important the results suggest that previous studies are susceptible to specification bias from omitted variables

forecast accuracy of individual analysts in nine industries the purpose of this paper is to investigate whether financial analysts with superior earnings forecasting ability can be distinguished on the basis of ex post forecast accuracy i explore the question by estimating and comparing average accuracy across individuals and by considering whether the observed distribution of analyst forecast accuracies differs from the distribution expected if their relative performances each year were purely random overall i do not find systematic differences in forecast accuracy across individuals financial press coverage suggests there are superior financial analysts for example institutional investor s annual all american research team includes analysts rated by money managers as superior on a variety of criteria including earnings forecasting ability to pick stocks and the quality of written reports clearly financial analyst services other than forecast accuracy are valued by their clients i focus on only one activity earnings forecasting for two reasons first forecast data are available quantitative and can be evaluated against observable earnings outcomes services such as insightful well written research reports are harder to evaluate quantitatively second academic use of analyst forecasts as earnings expectations data in capital markets empir

dynamic market models in industrial organization abstract this paper surveys empirical work done on dynamic models of market performance these fall into one of two categories structural models which model how market structure and performance change in response to entry and reduced form models which describe change regardless of how it is brought about a typical example of each type of model is chosen from the literature and simulations are used to draw out the implications of the estimated coefficients both models depict the competitive process in the us economy as being extremely slow

the growth potential of startups over the business cycle this paper shows that employment in cohorts of us firms is strongly influenced by aggregate conditions at the time of their entry employment fluctuations of startups are procyclical they persist into later years and cohort level employment variations are largely driven by differences in firm size rather than the number of firms an estimated general equilibrium firm dynamics model reveals that aggregate conditions at birth rather than post entry choices drive the majority of cohort level employment variation by affecting the share of startups with high growth potential in the aggregate changes in startup conditions result in large slow moving fluctuations in employment

price behavior in korean manufacturing this paper investigates pricing behavior in korean manufacturing the two questions investigated are whether price behavior in the two markets are distinctly different in the pass through of exchange rate into export and domestic prices and if so the subsequent question is whether observed differences in the price behavior can be explained by the price discrimination hypothesis using data from six manufacturing sectors for the period 1976 90 the authors find that korean manufacturing firms appear to have followed distinctly different pricing rule in the two markets and the hypothesis of price discrimination in the two markets cannot be rejected copyright 1994 by mit press

frictionless commerce a comparison of internet and conventional retailers there have been many claims that the internet represents a new nearly frictionless market our research empirically analyzes the characteristics of the internet as a channel for two categories of homogeneous products books and cds using a data set of over 8 500 price observations collected over a period of 15 months we compare pricing behavior at 41 internet and conventional retail outlets we find that prices on the internet are 9 16 lower than prices in conventional outlets depending on whether taxes shipping and shopping costs are included in the price additionally we find that internet retailers price adjustments over time are up to 100 times smaller than conventional retailers price adjustments presumably reflecting lower menu costs in internet channels we also find that levels of price dispersion depend importantly on the measures employed when we compare the prices posted by different internet retailers we find substantial dispersion internet retailer prices differ by an average of 33 for books and 25 for cds however when we weight these prices by proxies for market share we find dispersion is lower in internet channels than in conventional channels reflecting the dominance of certain heavily branded retailers we conclude that while there is lower friction in many dimensions of internet competition branding awareness and trust remain important sources of heterogeneity among internet retailers

creative destruction and uncertainty uncertainty rises in recessions but does uncertainty cause downturns or vice versa this paper argues that counter cyclical uncertainty fluctuations are a by product of technology growth in a firm dynamics model with endogenous technology adoption faster technology growth widens the dispersion of firm level productivity shocks a benchmark uncertainty measure moreover faster technology growth spurs a creative destruction process generates a temporary downturn and renders uncertainty counter cyclical estimates from structural vector autoregressions vars on u s data confirm the model s predictions on average 1 4 of the cyclical variation in uncertainty is driven by technology shocks this fraction rises to 2 3 around the dot com bubble

competitive search equilibrium in this paper i construct an equilibrium for markets with frictions which is competitive in the sense that all agents are price takers and maximize utility subject to a set of market parameters i show that the equilibrium allocation is socially optimal i also show how the competitive search equilibrium can be achieved if employers with vacancies can advertise publicly the wages they pay

the wisdom of competitive crowds when several individuals are asked to forecast an uncertain quantity they often face implicit or explicit incentives to be the most accurate despite the desire to elicit honest forecasts such competition induces forecasters to report strategically and nontruthfully the question we address is whether the competitive crowd s forecast the average of strategic forecasts is more accurate than the truthful crowd s forecast the average of truthful forecasts from the same forecasters we analyze a forecasting competition in which a prize is awarded to the forecaster whose point forecast is closest to the actual outcome before reporting a forecast we assume each forecaster receives two signals one common and one private these signals represent the forecasters past shared and personal experiences relevant for forecasting the uncertain quantity of interest in a set of equilibrium results we characterize the nature of the strategic forecasts in this game as the correlation among the forecasters priva

interpreting the korean crisis financial liberalisation industrial policy and corporate governance as the interpretation of its economic miracle has been so the interpretation of the recent crisis in korea remains highly controversial 1 although there are many important issues which have been raised by the korean crisis such as exchange rate policy labour market policy and the architecture of the international financial system chang 1998a three issues have been especially controversial in the debate financial liberalization industrial policy and corporate governance

modifying variability and correlations in winner take all contests we consider contests with a fixed proportion of winners based on relative performance special attention is paid to winner take all contests which we define as contests with relatively few winners receiving relatively large awards but we consider the full range of values of the proportion of winners if a contestant has the opportunity to modify the distribution of her performance what strategy is advantageous when the proportion of winners is less than one half a riskier performance distribution is preferred when this proportion is greater than one half it is better to choose a less risky distribution using a multinormal model we consider modifications in the variability of the distribution and in correlations with the performance of other contestants increasing variability and decreasing correlations lead to improved chances of winning when the proportion of winners is less than one half and the opposite directions should be taken for proportions greater than one half thus it is better to take chances and to attempt to distance oneself from the other contestants i e to break away from the herd when there are few winners a more conservative herding strategy makes sense when there are many winners our analytical and numerical results indicate that the probability of winning can change substantially as variability and or correlations are modified furthermore in a game theoretic setting in which all contestants can make modifications choosing a riskier less risky performance distribution when the proportion of winners is low high is the dominant best response strategy we briefly consider some practical issues related to the recommended strategies and some possible extensions

combining economic forecasts a method for combining forecasts may or may not account for dependence and differing precision among forecasts in this article we test a variety of such methods in the context of combining forecasts of gnp from four major econometric models the methods include one in which forecasting errors are jointly normally distributed and several variants of this model as well as some simpler procedures and a bayesian approach with a prior distribution based on exchangeability of forecasters the results indicate that a simple average the normal model with an independence assumption and the bayesian model perform better than the other approaches that are studied here

the cyclicality of separation and job finding rates this paper uses cps gross flow data to analyze the business cycle dynamics of separation and job finding rates and to quantify their contributions to overall unemployment variability cyclical changes in the separation rate are negatively correlated with changes in productivity and move contemporaneously with them while the job finding rate is positively correlated with and tends to lag productivity contemporaneous fluctuations in the separation rate explain between 40 and 50 percent of fluctuations in unemployment depending on how the data are detrended this figure becomes larger when dynamic interactions between the separation and job finding rates are considered

costly bidding in online markets for it services internet enabled markets are becoming viable venues for procurement of professional services we investigate bidding behavior within the most active area of these early knowledge markets the market for software development these markets are important both because they provide an early view of the effectiveness of online service markets and because they have a potentially large impact on how software development services are procured and provided using auction theory we develop a theoretical model that relates market characteristics to bidding and transaction behavior taking into account costly bidding we then test our model using data from an active online market for software development services which yields contracts for 30 40 of posted projects in its current format however the studied market may induce excessive bidding by vendors consistent with our theoretical predictions and those of carr 2003 higher value projects attract significantly more bids with lower average quality greater numbers of bids raise the cost to all participants due to costly bidding and bid evaluation perhaps as a consequence higher value projects are also much less likely to be awarded

market structure entry and performance in korea this paper applies a recursive model of structure entry performance with structural feedbacks to sixty two korean manufacturing industries for 1976 81 the results strongly support the market power hypothesis the results also indicate that despite active government intervention the invisible hand is working structure is evolving as expected with high profits leading to entry and consequently lower profits however there is little support for limit pricing hypotheses in this explosively growing economy copyright 1990 by mit press

how endogenous risk preferences and sample selection affect analysis of firm survival the roles of selection and endogeneity in measured risk preferences are illustrated using the correlation between risk attitudes and firm survival selection bias occurs when risk attitudes are elicited only from current entrepreneurs so that the risk attitudes of unsuccessful entrepreneurs are excluded from the analysis risk attitudes measured after agents enter entrepreneurship will endogenously reflect business success data on entrepreneurs from the national longitudinal survey of youth 1979 and the panel study of income dynamics shows that when risk attitudes are measured subject to selection and endogeneity mixed or even positive correlations between risk acceptance and the probability of firm exit occur however firm exits fall monotonically with willingness to accept risk when risk preference measures are not subject to selection or endogeneity related to business success

optimal aggregation of money supply forecasts accuracy profitability and market efficiency we present a general procedure for aggregating expert forecasts which exploits regularities in the structure of information within the forecaster population specific information structures lead to aggregation methods which adjust for additive bias differences in individual accuracy and correlation among forecasts as an application we construct composite predictions of the weekly change in the money supply from forecasts made by twenty major securities dealers for which high positive correlation is found to be a significant characteristic due to instability in the information structure our methods cannot improve on the accuracy of a simple average in this case however they do capture information about the correlation among money supply forecasts which is not fully impounded in short term interest rates forecasts from our models accurately predict the direction of price changes for treasury bills and treasury bill futures after a money supply announcement the adjustment of prices to information in financial markets has been studied at length mostly from the perspective of the efficient markets hypothesis market efficiency tests typically look at the behavior of prices the end product

market dynamics and dichotomy evidence from taiwanese manufacturing in taiwan a dichotomous market structure is closely related to the progress of economic development the purpose of the present article is to examine the market dynamics and dichotomous nature of taiwanese manufacturing a model of dynamic adjustment of industry structure is considered when both the speed of adjustment and the long run market concentration are allowed to vary across industries we use 118 four digit manufacturing industries for empirical analysis of our models spanning between 1981 and 1991 empirical findings show that both the speed of adjustment and long run industry concentration are predominantly determined by minimum efficient scale the speed of adjustment is much faster in a small open economy like taiwan compared to mature economies like the us and australia in addition the dichotomous nature of the market is supported in our findings for both periods viz 1981 1986 and 1986 1991 albeit weaker for the later period

unanimity and compromise among probability forecasters when two forecasters agree regarding the probability of an uncertain event should a decision maker adopt that probability as his or her own a decision maker who does so is said to act in accord with the unanimity principle we examine a variety of bayesian consensus models with respect to their conformance or lack thereof to the unanimity principle and a more general compromise principle in an analysis of a large set of probability forecast data from meteorology we show how well the various models when fit to the data reflect the empirical pattern of conformance to these principles

grown up business cycles the entry rate of u s employer businesses has declined for more than 30 years we use a novel dynamic decomposition framework to show that regardless of its causes the direct effects of the continued decline in the entry rate and its delayed effects on the firm age distribution together play a major role in the slowing of trend employment growth and the emergence of jobless recoveries we identify changing demographic structure of the population and increased import competition as leading factors behind the decline in startup activity received september 1 2015 editorial decision april 5 2018 by editor francesca cornelli authors have furnished an internet appendix which is available on the oxford university press web site next to the link to the final published paper online

inefficient hiring in entry level labor markets hiring inexperienced workers generates information about their abilities if this information is public workers obtain its benefits if workers cannot compensate firms for hiring them firms will hire too few inexperienced workers i determine the effects of hiring workers and revealing more information about their abilities through a field experiment in an online marketplace i hired 952 randomly selected workers giving them either detailed or coarse public evaluations both hiring workers and providing more detailed evaluations substantially improved workers subsequent employment outcomes under plausible assumptions the experiment s market level benefits exceeded its cost suggesting that some experimental workers had been inefficiently unemployed

indivisible labor lotteries and equilibrium abstract this paper considers an economy where labor is indivisible and agents are identical although the discontinuity in labor supply at the individual level disappears as a result of aggregation it is shown that indivisible labor has strong consequences for the aggregate bahavior of the economy it is also shown that optimal allocations involve lotteries over employment and consumption

profit entry and changes in concentration abstract the simultaneity between profit entry and changes in concentration is examined the sample includes 481 observations on 4 digit industries over the years 1972 1977 and 1977 1982 results show that profits respond positively to entry barriers and initial concentration net entry responds positively to initial profits and responds negatively to entry barriers concentration moves toward its steady state level but the rate of adjustment is very slow the competitive process left on its own does not seem to move quickly toward equilibrium

indivisible labor and the business cycle abstract a growth model with shocks to technology is studied labor is indivisible so all variability in hours worked is due to fluctuations in the number employed we find that unlike previous equilibrium models of the business cycle this economy displays large fluctuations in hours worked and relatively small fluctuations in productivity this finding is independent of individuals willingness to substitute leisure across time this and other findings are the result of studying and comparing summary statistics describing this economy an economy with divisible labor and post war u s time series

growth economies of scale and targeting in japan 1955 1990 this paper explores the usage of various industrial policy tools in japan contrary to the conventional wisdom the authors find that a disproportionate amount of japanese targeting occurred in low growth sectors and sectors with decreasing returns to scale in addition they find no evidence that productivity was enhanced as a result of industrial policy measures copyright 1996 by mit press

averages of forecasts some empirical results an alternative to using a single forecasting method is to average the forecasts obtained from several methods in this paper we investigate empirically the impact of the number and choice of forecasting methods on the accuracy of simple averages it is concluded that the forecasting accuracy improves and that the variability of accuracy among different combinations decreases as the number of methods in the average increases thus combining forecasts seems to be a reasonable practical alternative when as is often the case a true model of the data generating process or a single best forecasting method cannot be or is not for whatever reasons identified

innovation and the evolution of market structure this paper examines the association between innovation and the evolution of market structure a dynamic model of market concentration is applied to seventy three u k industries 1970 79 and the results are found to be consistent with the hypothesis that innovation is deconcentrating the results reported here and those contained in earlier work combine to suggest that innovation and changes in market concentration interact in a relatively rapid mutually reinforcing but rather weak spiral of increased innovation and decreasing concentration copyright 1990 by blackwell publishing ltd

the dynamics of market structure abstract in this paper changes in market concentration are modelled in terms of long run steady state levels and the adjustment towards them both the speed of adjustment and the long run levels of concentration are allowed to vary across industries non linear three stage least squares estimates for allowing for the endogeneity of profits and advertising for 184 u s industries 1963 1967 suggest that both the speed of adjustment and the levels of concentration in the long run are largely determined by minimum efficient scale

the role of startups for local labor markets there are substantial differences in startup activity across us local labor markets we study the causes and consequences of these differences startup productivity shocks are found to drive much of these cross city differences in startup activity examples of such shocks include breakthroughs in biotech that spurred startup formation in san diego and philadelphia overall these shocks explain half of the forecast error variance of startup job creation accounting for 40 of population growth and long run changes in employment shocks to barriers to firm entry have economy wide effects similar to those of startup productivity shocks but operate largely through the number of startups rather than their size we use a novel spatial panel vector autoregression identifying shocks using shift share external instruments

average of forecasts an improvement stein rules are used in forming combination forecasts such forecasts have smaller prediction risk under certain conditions than the preferred method of average of forecasts the new composite forecasts will be theoretically biased but are likely to have smaller mean squared error of forecasts as shown in the empirical exercises examined when the forecasts appear to be unbiased and have a common mean lindley type combination is most useful

is it better to average probabilities or quantiles we consider two ways to aggregate expert opinions using simple averages averaging probabilities and averaging quantiles we examine analytical properties of these forecasts and compare their ability to harness the wisdom of the crowd in terms of location the two average forecasts have the same mean the average quantile forecast is always sharper it has lower variance than the average probability forecast even when the average probability forecast is overconfident the shape of the average quantile forecast still offers the possibility of a better forecast using probability forecasts for gross domestic product growth and inflation from the survey of professional forecasters we present evidence that both when the average probability forecast is overconfident and when it is underconfident it is outperformed by the average quantile forecast our results show that averaging quantiles is a viable alternative and indicate some conditions under which it is likely to be more useful than averaging probabil

reputation transferability in online labor markets online workplaces such as odesk amazon mechanical turk and taskrabbit have been growing in importance over the last few years in such markets employers post tasks on which remote contractors work and deliver the product of their work online as in most online marketplaces reputation mechanisms play a very important role in facilitating transactions since they instill trust and are often predictive of the employer s future satisfaction however labor markets are usually highly heterogeneous in terms of available task categories in such scenarios past performance may not be an accurate signal of future performance to account for this natural heterogeneity in this work we build models that predict the performance of a worker based on prior category specific feedback our models assume that each worker has a category specific quality which is latent and not directly observable what is observable though is the set of feedback ratings of the worker and of other contractors with similar work his

income and wealth heterogeneity in the macroeconomy how do movements in the distribution of income and wealth affect the macroeconomy we analyze this question using a calibrated version of the stochastic growth model with partially uninsurable idiosyncratic risk and movements in aggregate productivity our main finding is that in the stationary stochastic equilibrium the behavior of the macroeconomic aggregates can be almost perfectly described using only the mean of the wealth distribution this result is robust to substantial changes in both parameter values and model specification our benchmark model whose only difference from the representative agent framework is the existence of uninsurable idiosyncratic risk displays far less cross sectional dispersion and skewness in wealth than u s data however an extension that relies on a small amount of heterogeneity in thrift does succeed in replicating the key features of the wealth data furthermore this extension features aggregate time series that depart significantly from permanent income behavior

the asian debt and development crisis of 1997 causes and consequences abstract interpretations of the asian crisis have coalesced around two rival stories the death throes of asian state capitalism story about internal real economy causes and the panic triggering debt deflation in a basically sound but under regulated system story that gives more role to external and financial system causes the paper presents the stories and assesses the evidence the evidence in particular the chronology of the crisis supports the second rather better than the first the paper discusses the interests driving capital account liberalization without a framework of regulation the single most irresponsible act of public authorities in the whole crisis us and uk financial firms allied with their treasuries and with the imf the wto and the oecd saw themselves at a chronic disadvantage in the asian system of long term relationships and patient capital this alliance supported by segments of asian political and financial elites achieved dramatic domestic financial sector liberalization and capital account opening in asia over the 1990s setting up the conditions for crisis paradoxically the crisis may be looked back upon not as the triumph of benign globalization and neoliberal economic doctrine but as the beginning of its end

understanding international prices customers as capital the article develops a new theory of pricing to market driven by dynamic frictions of building market shares our key innovation is a capital theoretic model of marketing in which relations with customers are valuable we discipline the introduced friction using data on differences between short run and long run price elasticity of international trade flows we show that the model accounts for several pricing puzzles of international macroeconomics jel e13 f14 f31 f41 f44 m31

distributions of forecasting errors of forecast combinations implications for inventory management inventory control systems rely on accurate and robust forecasts of future demand to support decisions such as setting of safety stocks the combination of multiple forecasts is shown to be effective not only in reducing forecast errors but also in being less sensitive to limitations of a single model research on forecast combination has primarily focused on improving accuracy largely ignoring the overall shape and distribution of forecast errors nonetheless these are essential for managing the level of aversion to risk and uncertainty for companies this study examines the forecast error distributions of base and combination forecasts and their implications for inventory performance it explores whether forecast combinations transform the forecast error distribution towards desired properties for safety stock calculations typically based on the assumption of normally distributed errors and unbiased forecasts in addition it considers the similarity between in and out of sample characteristics of such errors and the impact of different lead times the effects of established combination methods are explored empirically using a representative set of forecasting methods and a dataset of 229 weekly demand series from a leading household and personal care uk manufacturer findings suggest that forecast combinations make the in and out of sample behaviour more consistent requiring less safety stock on average than base forecasts furthermore we find that using in sample empirical error distributions of combined forecasts approximates well the out of sample ones in contrast to base forecasts

is a group of economists better than one than none can economists forecast the direction of economic growth casual observation indicates that individual economists make poor predictions of economic growth and that their forecasts are highly correlated this article discusses the loss of information resulting from correlation and develops a method of combining forecasts that are cross sectionally correlated this approach greatly increases the accuracy of near term forecasts of the direction of economic growth although the individual with the best historical performance is better over longer horizons overall when the data are properly aggregated economists predict the direction of near term economic growth and call turning points reasonably well copyright 1996 by university of chicago press

credit and efficiency in centralized and decentralized economies we study a credit model where because of adverse selection unprofitable projects may nevertheless be financed indeed they may continue to be financed even when shown to be low quality if sunk costs have already been incurred we show that credit decentralization offers a way for creditors to commit not to refinance such projects thereby discouraging entrepreneurs from undertaking them initially thus decentralization provides financial discipline nevertheless we argue that it puts too high a premium on short term returns the model seems pertinent to two issues soft budget constraint problems in centralized economies and differences between anglo saxon and german japanese financing practices

lost generations of firms and aggregate labor market dynamics abstract can the unprecedented lack of startups during the u s great recession have persistently negative effects while fewer firms hiring workers can mechanically reduce employment for many years this may be offset by feedback effects on lower wages slacker labor markets and higher profits an estimated model of firm dynamics and frictional labor markets suggests that such feedback effects are too weak to offset the direct impact of fewer startups had firm entry remained constant during the great recession output would have recovered 4 6 years earlier and unemployment would have been 0 5 percentage points lower even 10 years after the crisis

an east asian model of economic development japan taiwan and south korea the east asian model of economic development focuses on 5 shared characteristics that seem significant in the contemporary economic development of japan taiwan and korea they are economic characteristics and include 1 high investment ratios 2 small public sectors 3 competitive labor markets 4 export expansion and 5 government intervention in the economy large and efficient investments in human capital and well developed capacities to absorb new technology are 2 other economic features shared by the three one could add overcrowding high man land ratios and scarcity of natural resources though these are handicaps rather than sources of economic strength it is possible however that virtue springs from necessity and that ample arable land or abundant natural resources mainly permit governments to postpone the difficult decisions needed to promote development rather than provide the wherewithal needed to finance development other noneconomic characteristics of the three such as ethnic and linguistic homogeneity relatively compact geography manageable population size and the confucian tradition have not been considered in the model even though they have undoubtedly influenced labor productivity savings behavior and other aspects of economic performance whether the east asian model ought to be followed depends on whether current and foreseeable circumstances are sufficiently like those faced by the three to justify using the same policies that they used applicability of the east asian model should also depend on whether the strategy employed by the three has been responsible for their economic success 2 aspects of the east asian models policy features are noteworthy 1 the policies typically work by influencing rather than replacing private market decisions and 2 the public expects government to intervene to influence economic growth

unemployment and the labor share abstract the labor share fluctuates over the business cycle to explain this behavior we develop a novel model featuring direct competition between heterogeneous firms to hire workers this simultaneously endogenizes both average match productivity and the division of output between workers and firms in existing matches wages partly reflect labor market conditions at the time of hiring a positive tfp shock therefore reduces the aggregate labor share making it counter cyclical however greater competition and lower unemployment increase labor s share among new firms as more firms enter the aggregate labor share rises and eventually overshoots its initial level as in the data

trimmed opinion pools and the crowd s calibration problem we introduce an alternative to the popular linear opinion pool for combining individual probability forecasts one of the well known problems with the linear opinion pool is that it can be poorly calibrated it tends toward underconfidence as the crowd s diversity increases i e as the variance in the individuals means increases to address this calibration problem we propose the exterior trimmed opinion pool to form this pool forecasts with low and high means or cumulative distribution function cdf values are trimmed away from a linear opinion pool exterior trimming decreases the pool s variance and improves its calibration a linear opinion pool however will remain overconfident when individuals are overconfident and not very diverse for these situations we suggest trimming away forecasts with moderate means or cdf values this interior trimming increases variance and reduces overconfidence using probability forecast data from u s and european surveys of professional forecasters we present empirical evidence that trimmed opinion pools can outperform the linear opinion pool this paper was accepted by rakesh sarin decision analysis

self employment over the business cycle in the usa a decomposition entry rates into self employment increase during recessions and decrease during economic upswings i show that this is mostly explained by the higher unemployment rate during a recession together with the fact that at all times unemployed persons have a relatively high propensity to become self employed out of necessity i use econometric decomposition techniques to quantify these effects based on the monthly matched us current population survey before during and after the great recession i also document that the entry rate into self employment with unincorporated businesses strongly increased during the recession but not into self employment with incorporated businesses this highlights the association of unincorporated and incorporated self employment with necessity and opportunity entrepreneurship respectively the results are useful for policymakers and practitioners to understand forecast and act on the different types of self employment that can be expected over the business cycle there are also important implications for theories of the cyclicality of unemployment and entrepreneurship plain english summary self employment will increase during recessions when unemployment is high but it may not boost innovation during recessions increased unemployment underlies the higher entry rate into self employment our evidence is from representative survey data from the usa covering the great recession the upside is that self employment enables workers who lose their jobs to continue to work which can speed up the subsequent economic recovery thus public policy should enable people to start businesses however as during recessions the unemployed mostly start unincorporated businesses one cannot expect them to boost innovation as much as start ups during better economic times these insights also speak to the 2020 recession triggered by covid 19 if unemployment remains high after the relaxation of the lockdowns a rise can be expected especially in non innovative self employment thus the principal policy implication of this study is that policymakers should ensure that their expectations for new businesses started during deep recessions are realistic for the circumstances

cooperation for monopolization an empirical analysis of cartelization this paper examines the ability of a large numbers cartel to raise price cost margins the cartel in question is a dairy cooperative associated milk producers inc ampi with more than 30 000 members we develop a model of spatial limit pricing that we test using the method of seemingly unrelated regressions adjusting for serial correlation our results suggest that the cartel successfully obtained and used market power and that its power was proportional to its market share in contrast after an antitrust consent decree margins fell significantly and were no longer related to market shares these results are robust under both pooled and market fixed effects analysis copyright 1994 by mit press

percentage and relative error measures in forecast evaluation properties of two large families of scale free forecast accuracy measures that include popular measures such as mean absolute percentage error relative error and squared percentage error are examined in this paper we describe the optimal reports when forecasts are evaluated using these measures we also provide analytic expressions for the optimal bayes act associated with these measures under a general power transformation for several well known probability distributions we then show that using measures from these two families may inadvertently provide incentives for either pessimism or optimism among forecasters i e rewarding underforecasts or overforecasts relative to some reference measure of central tendency as an illustration of these concepts we examine the use of these measures for model selection in a forecast aggregation example using stock price forecasts derived from the thomson reuters institutional brokers estimate system this example illustrates how aggregation methods that alw

the value of combining forecasts in inventory management a case study in banking managing inventories in the face of uncertain stochastic demand requires an investment in safety stocks these are related to the accuracy in forecasting future demands and the noise in the demand generation process reducing the demand forecasting error can free up capital and space and reduce the operating costs of managing the inventories a leading bank in hong kong consumes more than three hundred kinds of printed forms for its daily operations a major problem of its inventory control system for the forms management is to forecast the monthly demand of these forms in this study the idea of combining forecasts is introduced and its practical application is addressed the individual forecasts come from well established time series models and the weights for combination are estimated with quadratic programming the combined forecast is found to perform better than any of the individual forecasts

tourism forecasting to combine or not to combine abstract existing non tourism related literature shows that forecast combination can improve forecasting accuracy this study tests this proposition in the tourism context by examining the efficiency of combining forecasts based on three different combination methods the data used for this study relate to tourist arrivals in hong kong from the top ten tourism generating countries regions the forecasts are derived from four different forecasting models autoregressive integrated moving average arima model autoregressive distributed lag model adlm error correction model ecm and vector autoregressive var model all forecasts are ex post and the empirical results show that the relative performance of combination versus single model forecasts varies according to the origin destination tourist flow under consideration which parallels previous findings regarding the relative performance of individual forecasting methods the results also vary with the combination techniques used furthermore although the combined forecasts do not always outperform the best single model forecasts almost all the combined forecasts are not outperformed by the worst single model forecasts this suggests that forecast combination can considerably reduce the risk of forecasting failure this conclusion also implies that combined forecasts are likely to be preferred to single model forecasts in many practical situations

a new methodology linking concentration dynamics to current and steady state profits examining korean industrial policy during take off abstract we model the dynamics of industrial structure and market power using korean manufacturing data during the take off period 1978 82 structure conduct performance scp methodologies have been criticized for using accounting data and because a few superior firms may have greater shares and greater profits both are argued to present possible spurious correlations between concentration and profits this paper follows earlier work which shows that market structure responds to observed accounting profits as if these were accurate indices of real profits and not as if leading firms are perceived to have unmatchable advantages the methodological contribution of this model is a new latent variable for steady state profits derived from the speed of structural adjustment long run profits are identified by the hypothesis that structural adjustment will be more rapid when industries are farther from steady state levels we analyze the long run profits latent variable finding strong support for this hypothesis the speed of adjustment is greater for positive and negative deviations from steady state structure we show that the profits and structural adjustment relationship is non monotone the scp criticisms above are based on spurious correlations which are monotone in profits and structure positing spurious correlations which are at the same time monotone in structure and non monotone in structural adjustment seems less plausible than accepting the scp results which are consistent with both our analysis also is new in that it is the first direct econometric analysis of korean industrial policy during its take off years we note that in korea unlike elsewhere industrial policy was hypothesized to lead to concentration and market power in the popular press and by professional economists ours is the first direct econometric analysis of this hypothesis and we find it supported

the contribution of large and small employers to job creation in times of high and low unemployment we document a negative correlation at business cycle frequencies between the net job creation rate of large employers and the level of aggregate unemployment that is much stronger than for small employers the differential growth rate of employment between initially large and small employers has an unconditional correlation of 0 5 with the unemployment rate and varies by about 5 percent over the business cycle we exploit several datasets from the united states denmark and france both repeated cross sections and job flows with employer longitudinal information spanning the last four decades and several business cycles we discuss implications for theories of factor demand jel d22 e23 e32 j23 l25

market based measures of monetary policy expectations a number of recent articles have used different financial market instruments to measure near term expectations of the federal funds rate and the high frequency changes in these instruments around federal open market committee announcements to measure monetary policy shocks this article evaluates the empirical success of a variety of financial market instruments in predicting the future path of monetary policy all of the instruments we consider provide forecasts that are clearly superior to those of standard time series models at all of the horizons considered among financial market instruments we find that federal funds futures dominate all the other securities in forecasting monetary policy at horizons out to six months for longer horizons the predictive power of many of the instruments we consider is very similar in addition we present evidence that monetary policy shocks computed using the current month federal funds futures contract are influenced by changes in the timing of policy actions tha

optimal oligopoly pricing and the threat of entry in earlier work we tested stochastic dynamic limit pricing using u s data we replicate these tests using canadian data the results are weak but consistent with the earlier tests along the way we deal with several methodological problems how does the new rational limit pricing relate to the test how might oligopoly influences be integrated into limit pricing how should existing concentration affect entrant behavior might factors which suppress industry profitability not ceteris paribus deter entry what might one do with correlated proxy variables should weak results be interpreted the same in a replication test as in a de novo test