the interest rate management and sterilization hypotheses for the uk under fixed exchange rates this study uses the vector autoregressive var technique and granger s definition of causality to examine the interest rate management and sterilization hypotheses of uk for the period 1955 i to 1974 iv our findings show that neither the long term government bond yield nor long term treasury bill rate of uk can be considered as a policy determined variable since each is subject to feedback from uk and us monetary and income variables in regard to the sterilization hypothesis our results indicate that the uk domestic credit is an exogenous variable with respect to uk foreign reserves and interest rates this result supports the implication of the monetary approach to the balance of payments that there was no sterilization in the uk during the fixed exchange rate period

closing the regional equity gap a critique of the department of trade and industry s regional venture capital funds initiative mason c m and harrison r t 2003 closing the regional equity gap a critique of the department of trade and industry s regional venture capital funds initiative reg studies 37 855 868 the uk labour government has provided support for the establishment of regional venture capital funds in each of the english regions as part of its drive to create an entrepreneurially led knowledge based economy this initiative is a response to persistent gaps in the provision of start up and early stage venture capital in this paper we question the likely effectiveness of the initiative on four counts first there is a lack of early stage venture capital skills available to manage the funds second the small size of the funds will make it difficult for them to achieve financial viability third the funds are targeting the wrong problem the maximum investment that they are allowed to make is 250 000 they may subsequently provide up to an additional 250 000 in follow on financing however the main fundin

evidence of nonlinearity in daily stock returns this article applies a newly developed statistical technique to time series of daily rates of return of 15 common stocks the technique involves estimating the bispectrum of the observed time series the bispectrum is defined as the double fourier transform of the third order cumulant function if the process generating rates of return is linear with independent innovations then the skewness of the bispectrum will be constant the article describes a test that can detect nonconstant skewness in the bispectrum hence if the test rejects constant skewness a nonlinear process is implied as a consequence the test can distinguish between white noise and purely random noise the results suggest that daily stock returns are generated by a nonlinear process

an equilibrium model of asset trading with sequential information arrival in an effort to better understand the dynamic market price adjustment process this paper develops a model which describes the impact of new information on a financial market the primary emphasis is on the price change volume relationship in the presence of a margin requirement we find that the margin requirement significantly affects the relation of price change to volume furthermore this relationship is shown to be affected by the number of investors in the market the degree of information dissemination differences in interpretation of information and the implicit cost of the margin requirement

on the frequency of large stock returns putting booms and busts into perspective textabstractnumerous articles have investigated the distribution of share prices and find that the returns are fat tailed nevertheless there is still controversy about the amount of probability mass in the tails and hence about the most appropriate distribution to use in modeling returns this controversy has proven hard to resolve as the alternatives are non nested we employ extreme value theory focusing exclusively on the larger observations in order to assess the tail shape within a unified framework we find that at least the first two moments exist this enables one to generate robust probabilities on large returns which put the recent stock market swings into historical perspective

the interrelation of stock and options market trading volume data this research empirically investigates the relation between common stock and call option trading volumes the paper hyothesizes and tests a sequential flow of information between the stock and option markets if information trading for cboe listed firms is predominantly accomplished through option trading then existing research methodologies may be biased against finding any significant economic consequences in those instances where option listing is an important variable results indicate that trading in call options leads trading in the underlying shares with a one day lag black 2 suggests that information traders may prefer trading in options rather than shares due to economic incentives provided by reduced transaction costs capital requirements and trading restrictions and due to the greater action afforded by option trading manaster and rendleman 12 empirically support black s 2 option information trading preference finding incremental information content in option prices up to twenty four hours prior to its reflection in stock prices jennings and starks 10 report that the stock price adjustment process upon arrival of new information differs for those firms listed on the chicago board option exchange cboe and they demonstrate that stock price adjustment to new information occurs more rapidly for firms with listed call options the results in both papers appear to warrant consideration of an optiontrading variable in the design of empirical tests both manaster and rendleman 12 and jennings and starks 10 investigate the price relation between shares and call options this paper investigates trading volume copeland 4 posits the use of trading volume as a proxy for the rate of information arrival he concludes that the relation between absolute value of price changes and volume is positive and linear if one accepts a sequentialinformation arrival hypothesis as valid the present research hypothesizes and tests a sequential flow of information between the stock and option markets analyses presented are based on econometric tests for causality1 derived from the works of granger 6 and sims 22 if information trading takes place

determinants of the low sme loan approval rate in croatia the paper proposes a new methodological framework for investigating consistency in loan assessment decisions and determinants of loan approval based on structural equation modelling and covariance structure analysis we focus on a governmental sme loan programme in croatia and investigate possible reasons for low loan approval rate that occurred in spite of interest rates subsidisation and sufficient supply of the loan funds the novelty of the methodological approach taken is that it enables simultaneous investigation of the determinants of the loan approval and testing for consistency in the loan assessment decisions which need not be assumed we test several hypotheses about consistency in the loan approval decisions and lending preferences in croatia the empirical findings reject overall consistency of criteria but indicate a preference toward smaller loans among all sme loan requests banks preferred smaller firms that requested smaller loans the results suggest that individual banks differ in their criteria and in their loan size preferences and that there is no positive correlation between the bank s size and its loan size preference

can socioeconomic heritage produce a lost generation with regard to entrepreneurship a considerable amount of literature deals with the influence of institutions on entrepreneurship but for all that little is known about the interplay between institutions and personal determinants of entrepreneurship in this paper the empirical evidence that older people in transition economies have low engagement in entrepreneurial activity is the starting point for analyzing how institutions moderate the relationship between individual characteristics and entrepreneurial choice the results show that the socioeconomic heritage of being exposed to socialism deters entrepreneurship an effect that is more pronounced for high impact entrepreneurship detailed analyses reveal that the effect is driven by devaluation of socialist work experience and the influence of socialism on mindset

comparing the impact of credit constraints on the growth of smes in a transition country with an established market economy in this paper we compare the role of internal finance on the growth of firms between a leading transition country slovenia and an established market economy belgium we find that firms in slovenia are more sensitive to internal financing constraints than their belgian counterparts furthermore we find that de novo firms and firms with long term debt are most constrained and that micro and smes can face great difficulties in accessing external sources of finance foreign firms however are able to raise external finance and consequently their growth is less reliant on the availability of internal finance our findings appear to indicate that although slovenian firms are no longer recipients of soft budget constraints the financial environment is not yet fully functional

price volatility trading volume and market depth evidence from futures markets the relations between volume volatility and market depth in eight physical and financial futures markets are examined evidence suggests that linking volatility to total volume does not extract all information when volume is partitioned into expected and unexpected components the paper finds that unexpected volume shocks have a larger effect on volatility further the relation is asymmetric the impact of positive unexpected volume shocks on volatility is larger than the impact of negative shocks finally consistent with theories of market depth the study shows large open interest mitigates volatility

testing for non linear structure in an artificial financial market abstract we present a stochastic simulation model of a prototype financial market our market is populated by both noise traders and fundamentalist speculators the dynamics covers switches in the prevailing mood among noise traders optimistic or pessimistic as well as switches of agents between the noise trader and fundamentalist group in response to observed differences in profits the particular behavioral variant adopted by an agent also determines his decision to enter on the long or short side of the market short run imbalances between demand and supply lead to price adjustments by a market maker or auctioneer in the usual walrasian manner our interest in this paper is in exploring the behavior of the model when testing for the presence of chaos or non linearity in the simulated data as it turns out attempts to determine the fractal dimension of the underlying process give unsatisfactory results in that we experience a lack of convergence of the estimate explicit tests for non linearity and dependence the bds and kaplan tests also give very unstable results in that both acceptance and strong rejection of iidness can be found in different realizations of our model all in all this behavior is very similar to experience collected with empirical data and our results may point towards an explanation of why robustness of inference in this area is low however when testing for dependence in second moments and estimating garch models the results appear much more robust and the chosen garch specification closely resembles the typical outcome of empirical studies

money income and sterilization tests for causality in the oil economy of kuwait the purpose of this investigation is to provide some evidence on two widely held hypotheses dominating monetary analysis in the small oil economy of kuwait and other gulf states the first posits that causality should run from money to income while the second emphasizes the neutral impact of external transactions on the domestic money supply

anticompetitive financial contracting the design of financial claims this paper presents the first model where entry deterrence takes place through financial rather than product market channels in standard models of the interaction between product and financial markets a firm s use of financial instruments deters entry by affecting product market behavior whereas in our model entry deterrence occurs by affecting the credit market behavior of investors towards entrant firms we find that in order to deter entry the claims held on incumbent firms should be sufficiently risky i e equity in contrast to the standard branderlewis 1986 result that debt deters entry the model sheds light on the policy debate on the separation of banking as to whether banks should be permitted to hold equity in firms it also provides an explanation for why venture capitalists hold automatically convertible securities in start up firms

causality in quantiles and dynamic stock return volume relations abstract this paper investigates the causal relations between stock return and volume based on quantile regressions we first define granger non causality in all quantiles and propose testing non causality by a sup wald test such a test is consistent against any deviation from non causality in distribution as opposed to the existing tests that check only non causality in certain moment this test is readily extended to test non causality in different quantile ranges in the empirical studies of three major stock market indices we find that the causal effects of volume on return are usually heterogeneous across quantiles and those of return on volume are more stable in particular the quantile causal effects of volume on return exhibit a spectrum of symmetric v shape relations so that the dispersion of return distribution increases with lagged volume this is an alternative evidence that volume has a positive effect on return volatility moreover the inclusion of the squares of lagged returns in the model may weaken the quantile causal effects of volume on return but does not affect the causality per se

intradaily price volume adjustments of nyse stocks to unexpected earnings the speed and path of adjustment in stocks to the degree of earnings surprise in their quarterly announcements are studied using price volume transactions data a differential price adjustment process was observed with stocks having large positive earnings surprises experiencing a faster adjustment compared with those stocks with negative earnings surprises volume transaction frequency and size were found to be directly related to the absolute degree of surprise but very favorable earnings surprise stocks experienced initially a large number of smaller trades while stocks with large unfavorable earnings surprises had relatively fewer transactions but higher volume per trade the stock market s microstructure has received increasing attention from researchers especially from an empirical perspective as transaction data on prices and volume have become more readily available 1 an important subset of this research has been the study of stock price adjustments to significant news events specifically publicly announced information with economic content should be quickly reflected in prices in an unbiased manner this paper contains a study of the intradaily adjustment in stocks to the informational content of earnings reports using price changes trading volume and transaction frequency and size we examine the transaction to transaction and time series stock behavior associated with different degrees of earnings surprise embedded in earnings announcements the degree of surprise is measured by a comparison of actual with forecasted earnings for 325 new york stock exchange nyse firms these firms are subdivided into five earnings surprise categories in order to determine whether the speed and path of their price volume adjustment processes are different one question of interest is whether the adjustment process for favorable versus unfavorable earnings surprises is similar or different another is whether any adjustment is distinguished by a few large trades or a large number of smaller

the effect of entrepreneurial rhetoric on microlending investment an examination of the warm glow effect microlending provides a valuable alternative to traditional financing for entrepreneurs in impoverished countries drawing from theory on political rhetoric and the concept of warm glow giving we examine characteristics of entrepreneurial narratives that are related to how quickly entrepreneurs receive funding using a sample of 6051 narratives from entrepreneurs in developing countries we demonstrate that narratives higher in language indicating blame and present concern lead to more rapid funding while narratives higher in accomplishment tenacity and variety lead to slower funding our findings suggest that the presentation of investment profiles should be carefully managed to maximize funding likelihood

monetary interdependence among g 3 countries this paper uses vector autoregressions to investigate the interdependence of the monetary policies of the central banks of germany japan and the united states granger sims causalities and innovation accounting mechanisms suggest that tri lateral linkages are strong and complex the results imply that the influence of foreign central banks policies limit each central bank s capacity to determine an independent domestic policy

the siable law model of stock returns this study investigates the tail shapes of empirical distributions of returns on an extensive group of common stocks the tails of the return distributions are found to be thinner than those of infinite variance stable distributions therefore although homogeneity is evident in general economic and statistical inferences drawn from stable law parameters estimated from samples of stock returns may be misleading this is in spite of the apparent overall similarity in shape between empirical and stable distributions

is lack of funds the main obstacle to growth ebrd s experience with small and medium sized businesses in central and eastern europe abstract small and medium sized enterprises smes potentially constitute the most dynamic firms in an emerging economy they are the ones most likely to move into areas of comparative advantage and high value added though they often face economic institutional and legal obstacles obstacles include limited access to working capital and long term credit legal and regulatory restrictions inadequate infrastructure high transaction costs and limited managerial and technical expertise despite the presence of multiple and often interrelated constraints however the widespread belief on which policies to support smes are based is that the lack of finance constitutes the main obstacle to the growth of smes enterprise survey work is the tool generally used to deepen our understanding of constraints affecting smes formation and growth the european bank for reconstruction and development ebrd is no exception in this respect during its early years it drew substantially on a set of enterprise surveys conducted by the world bank between 1991 and 1993 in hungary the czech and slovak federal republic csfr poland and russia investigating the obstacles faced by smes as the volume and geographical spread of its operations increased the ebrd felt the need to design and run its own surveys effectively addressing specific issues encountered in the context of its increasing lending and investment activity in central and eastern europe cee the findings of this analysis confirmed the belief that credit constraints constitute one of the main obstacles to growth of smes and encouraged the ebrd to tailor its financing instruments to the stage of transition of the country in question and the ability of the local financial system to assume key responsibilities this paper analyzes the way in which the ebrd strives to correct this capital market failure in the region in which it operates the fundamental principles on which ebrd policy is based are a preference for reaching the smes via local financial intermediaries a commercial approach to the provision of finance and finally a focus on development of the local financial system as a whole it is still too early to draw conclusions on ebrd activity in the field of smes financing based on other types of indicators than data on volume of signed commitments a large part of the loans is still in the grace period therefore investments are in an early phase and operation performance evaluation reports on this type of operations are still too few aggregate data on volume of ebrd financing through financial intermediaries paint an encouraging picture a 250 increase in the volume of such operations between 1994 and 1997 a nine fold increase in the number of subprojects between 1995 and 1997 and an ever widening geographical spread of activities and decreasing size of subprojects indicate that the experience of the ebrd in financing through financial intermediaries is on the whole positive financing provided to intermediaries is not necessarily always intended nor guaranteed to reach smes it is however guaranteed to create the appropriate financing channels which are necessary to ease the smes liquidity constraint this paper discusses the shortcomings of the financial system in the cee countries it outlines the ebrd policy to support smes and the various instruments employed so far and presents selected case studies to throw light on how good project design can help overcome difficult environments and lower the perception of risk connected to indigenous smes a summary of the findings of the survey work conducted by the ebrd in the region is also presented

estimation of garch process in the presence of structural change abstract this paper blends the switching regression model of goldfeld and quandt 1973 with the garch model of bollerslev 1987 in order to estimate and test for the significance of garch parameters in the presence of structural breaks the garch parameter values the switch date at which one regime supersedes another and the gradualness of each regime switch are all determined endogenously

strategic trading behavior and price distortion in a manipulated market anatomy of a squeeze abstract this paper investigates an attempted delivery squeeze in a bond futures contract traded in london using cash and futures trades of dealers and customers we analyze their strategic trading behavior price distortion and learning in a market manipulation setting we argue that marked differences in settlement failure penalties in the cash and futures markets create conditions that favor squeezes we recommend that regulators require special flagging of forward term repurchase agreements on the key deliverables that span futures contract maturity dates and that exchanges mark to market their contract specifications more frequently or consider a cash settled contract on a basket of bonds

innovation firm size and growth in a centralized organization the optimal innovation firm size and growth are derived for a centrally controlled firm in which only the entrepreneur evaluates and restores current projects or evaluates and adopts new projects current projects are subject to failure due to entry and possible obsolescence while new projects may not be successful the optimal allocation of attention implies bounds on firm size and that the rate of innovation depends not only on monopoly profits firm size and technological opportunity but also on the probability of obsolescence the effects of monopoly power and firm size on innovation also depend on the degree of obsolescence

testing for linear and nonlinear granger causality in the stock price volume relation linear and nonlinear granger causality tests are used to examine the dynamic relation between daily dow jones stock returns and percentage changes in new york stock exchange trading volume we find evidence of significant bidirectional nonlinear causality between returns and volume we also examine whether the nonlinear causality from volume to returns can be explained by volume serving as a proxy for information flow in the stochastic process generating stock return variance as suggested by clark s 1973 latent common factor model after controlling for volatility persistence in returns we continue to find evidence of nonlinear causality from volume to returns

effectiveness of selective credit policies alternative framework of evaluation abstract consequent upon the general criticisms of the conventional approaches used in evaluating the effectiveness of selective credit controls we have suggested other approaches the most emphasized of these is then applied to quarterly data for nigeria over the period 1970 i to 1983 ii the focus is on the selective credit controls on export supply import demand manufacturing production and mining production the controls are found to be effective in influencing only manufacturing production

the dependence between hourly prices and trading volume this study provides evidence on joint characteristics of hourly common stock trading vol ume and returns on the new york stock exchange average volume traded shows signifi cant differences across trading hours of the day and across days of the week average returns differ across hours ofthe day and to some extent across days ofthe week there is a strong contemporaneous relation between trading volume and returns and also a rela tion between trading volume and returns lagged up to four hours furthermore the trading volume returns relation is steeper for positive returns than for nonpositive returns

market conditions trader types and price volume relation in energy futures markets we investigate the asymmetric relations between trading volume and price changes and trading volume and price volatility of energy futures contracts across maturities and under different market conditions using a relatively long sample of daily observations we examine whether the impact of trading volume on returns and volatility of futures contracts can be time varying and dependent on the market condition we differentiate the market condition based on the slope of the forward curve into backwardation and contango the results indicate that trading volume and returns are positively related when the market is in backwardation and negatively related when the market is in contango in addition the positive relation between changes in trading volume and volatility of futures contracts seem to be stronger when the market is in backwardation than when it is in contango finally the results indicate that to a certain extent trade participation and trading activities of agents in energy futures markets can be explained by the slope of the forward curve which reflects the market condition and sentiment

the relationship between co2 emissions and economic growth the case of korea with nonlinear evidence abstract using star models we investigate the nonlinear dynamic properties and the interdependence of co2 emissions and economic growth for korea the estimation results indicate that the growth rate of both co2 emissions and industrial production exhibit a significant nonlinear asymmetric dynamics while the linear granger causality test finds no causality in any direction the results of the nonlinear granger causality tests show a two way causality between co2 emissions and economic growth the strong mutual causation between co2 emissions and economic activities indicates that the economic impact from co2 mitigation is expected to be higher in korea this suggests that the appropriate energy and environmental policy be to mitigate co2 emissions while having less impact on the economy

the relation between price changes and trading volume a survey this paper reviews previous and current research on the relation between price changes and trading volume in financial markets and makes four contributions first two empiri cal relations are established volume is positively related to the magnitude of the price change and in equity markets to the price change per se second previous theoretical research on the price volume relation is summarized and critiqued and major insights are emphasized third a simple model ofthe price volume relation is proposed that is consis tent with several seemingly unrelated or contradictory observations and fourth several directions for future research are identified

an empirical analysis of the stock price volume relationship abstract this paper investigates the empirical relationship between absolute stock price changes and trading volume in the stock market using granger causality tests we find that there is a significant causal relationship between absolute price changes and volume at the firm level and that this relationship is stronger in periods surrounding earnings announcements we view this as suggesting that information arrival follows a sequential rather than a simultaneous process although the results do not support an extreme version of either information arrival model

the capital gap for small technology companies public venture capital to the rescue in this paper we analyze effectiveness of public intervention for fostering private venture capital market in spain we use a sample obtained from venturexpert database consisting of 755 investments made by 83 spanish public and private venture capitalists that closed at least one fund between 1997 and 2008 we compare the investments undertaken by private and public investors before and after public venture capital programs were started we found that spanish venture capital market has rapidly developed in the last 10 years and that this development coincides with the establishment of public policies for encouraging technology entrepreneurship we also found that other factors such as previous experience of investors and size have also contributed to fostering more high risk investments these results may encourage governments in other countries to start or keep working to promote private venture capital investments

nonlinearities and nonstationarities in stock returns this article addresses the question of whether recent findings of nonlinearities in high frequency financial time series have been contaminated by possible shifts in the distribution of the data it applies a recursive version of the brock dechert scheinkman statistic to daily data on two stock market indexes between january 1980 and december 1990 it is shown that october 1987 is highly influential in the characterization of the stock market dynamics and appears to correspond to a shift in the distribution of stock returns sampling experiments show that simple linear processes with shifts in variance can replicate the behavior of the tests but autoregressive conditional heteroscedastic filters are unable to do so

intraday volume and volatility relations with and without public news this paper reexamines the dynamic relation between intraday trading volume and return volatility of large and small nyse stocks in two partitioned samples with and without identifiable public news we argue that the sequential information arrival hypothesis siah can be tested only in periods containing public news after partitioning the sample into periods with and without public news we find bi directional granger causality between volume and volatility in the presence of public information as hypothesized by the siah our analysis further suggests that return volatility is higher in the periods with public news while trading volume is significantly higher in the no news period perhaps owing to the importance of private information for trading stocks using the sample without public news we find evidence that volume granger causes volatility without feedback these results are broadly consistent with behavioral models like the overconfidence and biased self attribution model of daniel k hirshleifer d subrahmanyam a 1998 investor psychology and security market under and over reactions journal of finance 53 1839 1885 it appears that overconfident investors overrate the precision of their private news signals and therefore trade too aggressively in the absence of public news when public news arrives investors biased self attribution triggers excessive return volatility

modelling companies debt and dividend decisions with company accounts data reliable empirical models of company financial decisions have proved hard to construct using aggregate data this paper uses company specific data drawn from the published accounts of a large sample of uk companies to estimate a model of debt and dividend decisions an attempt is made to assess the relative importance of costs of funds the tax system the balance sheet and profitability of the company and of statutory controls in determining these key financial decisions diversity of behaviour is analysed by allowing for unobserved company specific effects and by examining subsets of the full sample

allocation of entrepreneurial attention abstract limited attention has been recognized by many economists as a scarce resource to be allocated among a given number of alternative uses however limited entrepreneurial attention is allocated between improving current operations and innovating new products which increases the number of current operations and perhaps the demands on the entrepreneur s attention the allocation of entrepreneurial attention thus endogenizes the number of uses to which attention can be allocated and the opportunity cost of attention this allocation has implications for the relationships between innovation firm size and monopoly profits between firm size and firm growth and the organization of the firm

small firms and economic transformation in bulgaria the pace of transition to a market economy has been slower in bulgaria than in some other east european countries in the 1990s output levels in the state owned sector which has not yet been subject to mass privatisation have fallen sharply and there has been a dramatic increase in unemployment there has however also been a rapid growth in the number of small firms and the ability of this sector to generate new jobs will be an important component of labour market dynamics in the future some of the main characteristics of this emergent sector are identified on the basis of a sample survey of nearly 400 small bulgarian firms covering competitiveness entrepreneurship innovation networking labour relations and business performance of the small firms key features of a subset of small firms with an orientation towards employment growth are identified

information content and the speed of stock price adjustment the process by which security prices adjust to the release of new information is an area of study which has received much attention in accounting and finance in finance the main interest has been whether prices adjust in a rapid and unbiased manner to new information in accounting the focus has been more on whether different accounting disclosures have information content the study reported here combined both interests in that we investigated the speed of adjustment of releases of information which had different degrees of information content as illustrations dann mayers and rabb 1977 tested the sensitivity of a block trade trading rule to the speed of price adjustments this rule first suggested by grier and albin 1973 is based on the assumption that abnormal returns can be earned by purchasing shares at the block price and selling at that day s closing price dann mayers and rabb hereafter dmr found that unless one could purchase the stock within five minutes of the block trade the profitability of the grier and albin rule was seriously impaired they also found the market price to be an unbiased estimate of the closing price within 15 minutes of the block trade similarly hillmer and yu 1979 devised an alternative test for the speed of price adjustment based on a cumulative sum technique they illustrated the technique by testing for shifts in the parameters of the distributions of price changes and of transaction frequencies around five information events two earnings announcements and three defense

the dynamic relationship between stock returns and trading volume domestic and cross country evidence abstract this paper examines the dynamic relations causal relations and the sign and magnitude of dynamic effects between stock market trading volume and returns and volatility for both domestic and cross country markets by using the daily data of the three largest stock markets new york tokyo and london major findings are as follows first trading volume does not granger cause stock market returns on each of three stock markets second there exists a positive feedback relationship between trading volume and return volatility in all three markets third regarding the cross country relationships us financial market variables in particular us trading volume contains an extensive predictive power for uk and japanese financial market variables fourth sub sample analyses show evidence of stronger spillover effects after the 1987 market crash and an increased importance of trading volume as an information variable after the introduction of options in the us and japan

measuring tail thickness to estimate the stable index α a critique a generalized pareto or simple pareto tail index estimate above 2 has frequently been cited as evidence against infinite variance stable distributions it is demonstrated that this inference is invalid tail index estimates greater than 2 are to be expected for stable distributions with as low as 1 65 the nonregular distribution of the likelihood ratio statistic for a null of normality and an alternative of symmetric stability is tabulated by monte carlo methods and appropriately adjusted for sampling error in repeated tests real stock returns yield a stable of 1 845 and reject iid normality at the 996 level

money income and causality in the united kingdom an empirical reexamination since the reduced form econometric exercises of friedman and meiselman 2 considerable research has been undertaken to determine the nature of the relationship running from money to income as well as the importance of reverse causation from income to money using an empirically testable defintion of causality proposed by granger 4 sims 7 developed an econometric technique to test for unidirectional causality in a two variable system in an application to u s nominal gnp and money data from 1949 iii to 1968 iv he reported that the main empirical finding is that the hypothesis that causality is unidirectional from money to income agrees with the postwar u s data whereas the hypothesis that causality is unidirectional from income to money is rejected 7 p 540 to examine the generality of sims s results williams goodhart and gowland 8 w g g undertook a similar study using u k data from 1958 i to 1971 iii a period when the bretton woods fixed exchange rate system prevailed they found that neither the causal relationship from money to income nor reverse causality from

omitted variables in equations relating prices to money this paper considers some of the conditions under which an estimated reduced form equation relating retail prices solely to past values of sterling m3 would provide a reliable guide to the past relationship between these two variables the equation does not appear to be biased by innovations in real output however when overseas variables are included in the reduced form the estimated relationship between money an prices chages significantly this suggests that the estimated parameters in a price equation based on money alone suffer form omitted variable bias

a markov model of switching regime arch in this article i present a new approach to model more realistically the variability of financial time series i develop a markov arch model that incorporates the features of both hamilton s switching regime model and engle s autoregressive conditional heteroscedasticity arch model to examine the issue of volatility persistence in the monthly excess returns of the three month treasury bill the issue can be resolved by taking into account occasional shifts in the asymptotic variance of the markov arch process that cause the spurious persistence of the volatility process i identify two periods during which there is a regime shift the 1974 2 1974 8 period associated with the oil shock and the 1979 9 1982 8 period associated with the federal reserve s policy change the variance approached asymptotically in these two episodes is more than 10 times as high as the asymptotic variance for the remainder of the sample i conclude that regime shifts have a greater impact on the properties of the data and i ca

testing for covariance stationarity in stock market data abstract this paper proposes several non parametric tests for covariance stationarity and applies them to common stock return data from 1834 1987 recursive variance plots post sample prediction tests cumulative sum henceforth cusum tests and modified scaled range tests all show strong non stationarity in stock returns primarily due to the large increase in volatility during the great depression these tests should be useful as diagnostics for data where the assumptions underlying the desired statistical procedure require stationarity

persistence in variance structural change and the garch model this article examines the persistence of the variance as measured by the generalized autoregressive conditional heteroskedasticity garch model in stock return data in particular we investigate the extent to which persistence in variance may be overstated because of the existence of and failure to take account of deterministic structural shifts in the model both an analysis of daily stock return data and a monte carlo simulation experiment confirm the hypothesis that garch measures of persistence in variance are sensitive to this type of model misspecification

the price variability volume relationship on speculative markets this paper concerns the relationship between the variability of the daily price change and the daily volume of trading on the speculative markets our work extends the theory of speculative markets in two ways first we derive from economic theory the joint probability distribution of the price change and the trading volume over any interval of time within the trading day and second we determine how this joint distribution changes as more traders enter or exit from the market the model s parameters are estimated by fiml using daily data from the 90 day t bills futures market the results of the estimation can reconcile a conflict between the price variability volume relationship for this market and the relationship obtained by previous investigators for other speculative markets this paper concerns the relationship between the variability of the daily price change and the volume of trading on speculative markets previous empirical studies 2 3 6 12 14 16 of both futures and equity markets always find a positive association between price variability as measured by the squared price change ap2 and the trading volume 2 there are two explanations for the relationship clark s 2 explanation which is secondary to his effort to explain why the probability distribution of the daily price change is leptokurtic emphasizes randomness in the number of within day transactions in clark s model the daily price change is the sum of a random number of within day price changes the variance of the daily price change is thus a random variable with a mean proportional to the mean number of daily transactions clark argues that the trading volume is related positively to the number of within day transactions and so the trading volume is related positively to the variability of the price change the second explanation is due to epps and epps 6 their model examines the mechanics of within day trading the change in the market price on each within day transaction or market clearing is the average of the changes in all of the traders reservation prices epps and epps assume there is a positive relationship between the extent to which traders disagree when they revise their reservation prices and the absolute value of the change in the market price that is an increase in the extent to which traders disagree is associated with a larger absolute price change the price variability volume relationship arises then because the volume of trading is positively related to the extent to which traders disagree when they revise their reservation prices

an examination of the empirical relationship between the dividend and investment decisions a note this paper empirically examines the separation principle which asserts that investment decisions are not influenced by dividend decisions existing empirical evidence on this proposition is inconclusive in this paper we employ causality tests to examine whether investment decisions are in fact statistically exogenous with respect to dividend decisions these tests are undertaken using both firm specific and aggregate data the results indicate no causal relationship from dividends to investment which provides support for the separation principle as an empirical proposition miller and modigliani 12 m m have demonstrated that in perfect capital markets the value of a firm is independent of the way the firm chooses to finance its investments one implication of this theorem is that investment decisions should not be influenced by dividend decisions although dividend decisions may or may not be influenced by investment decisions fama and miller 6 chapter 4 term this result the separation principle although extant capital markets are not perfect the validity of the separation principle as an empirical proposition has some natural appeal the empirical evidence on the subject is limited two of the better known studies dhrymes and kurz 4 and fama 5 use two stage least squares to estimate explicit models of the dividend and investment decisions dhrymes and kurz find that dividend investment decisions affect investment dividend decisions while fama concludes that no significant relationship exists between the two decisions fama suggests that the difference in results arises because dhrymes and kurz omitted certain lagged variables constrained the parameters of the dividend and investment models to be equal for all firms and chose inappropriate deflators fama admits however that his own results may be influenced by sampling errors that obscure the true relationship between dividends and investment thus the existing empirical evidence must be considered inconclusive