credit market imperfections and economic development theory and evidence abstract a model of credit markets in which there is a costly state verification problem is integrated into a neoclassical growth model the presence of a credit market friction gives rise to credit rationing which in turn impacts on the growth path of an economy the model delivers predictions about the co movements between per capita income credit rationing interest rates and factor prices the implications of the model are generally empirically supported in u s and taiwanese data the model also makes predictions about the consequences of government regulation of credit markets which are supported by the taiwanese data

economic liberalization and income inequality further evidence on the sri lankan experience abstract a recent paper by the author in this journal argued that inequality in sri lanka was lower after the 1977 economic liberalization policies were adopted this conclusion was based on two household surveys taken in 1969 1970 and 1980 1981 this note re examines the argument using five household surveys from 1969 1970 and 1981 1982 although the conclusionstill holds in general it is necessary to put it in a proper perspective

minimum market share this paper analyzes a specific model of oligopolistic competition involving product differentiation marketing activities and economies of scale in production this model is consistent with sales response models which have been justified on theoretical and empirical bases it is shown that at a nash equilibrium each firm must have market share equal to zero or greater than a threshold value this result has implications for determination of minimum firm size the effectiveness of a low market share strategy entry barriers and the likelihood of concentration in an industry the paper explores these implications and relates them to various theories and hypotheses in industrial organization and strategic planning

truth telling and nash equilibria in minimum cost spanning tree models abstract in this paper we consider the minimum cost spanning tree model we assume that a central planner aims at implementing a minimum cost spanning tree not knowing the true link costs the central planner sets up a game where agents announce link costs a tree is chosen and costs are allocated according to the rules of the game we characterize ways of allocating costs such that true announcements constitute nash equilibria both in case of full and incomplete information in particular we find that the shapley rule based on the irreducible cost matrix is consistent with truthful announcements while a series of other well known rules such as the bird rule serial equal split and the proportional rule are not

aggregate consumer behaviour and the measurement of inequality this paper presents an approach to inequality measurement based on an econometric model of aggregate consumer behaviour the novel feature of this model is that systems of individual demand functions can be recovered uniquely from the system of aggregate demand functions we present methods for evaluating social welfare based on an explicit social welfare function this social welfare function incorporates measures of individual welfare based on indirect utility functions for all consumer units we develop indexes of inequality based on actual and potential levels of social welfare

how good are standard debt contracts stochastic versus nonstochastic monitoring in a costly state verification environment the authors investigate ex ante efficient contracts in an environment in which implementation is costless in this environment standard debt contracts will typically not be optimal optimal contracts may involve defaults even in states in which the borrower is fully able to repay the authors then examine the welfare costs of arbitrarily restricting the set of feasible contracts to standard debt contracts when model parameters are calibrated to realistic values the welfare loss from exogenously imposing this restriction is extremely small thus if implementation costs are actually nontrivial as seems likely standard debt contracts will be very close to optimal copyright 1994 by university of chicago press

costly monitoring financial intermediation and equilibrium credit rationing abstract this paper establishes a link between equilibrium credit rationing and financial intermediation in a model with asymmetrically informed lenders and borrowers costly monitoring and investment project indivisibilities intermediation is shown to dominate borrowing and lending between individuals and these financial intermediaries exhibit several of the important features of intermediaries as we know them equilibrium interest rates and the aggregate quantity of loans respond quite differently to changes in taste and technology parameters depending on whether or not there is rationing in equilibrium

north south lending and endogenous domestic capital market inefficiencies abstract we develop an open economy model of intertemporal trade under asymmetric information capital market imperfections are endogenous and depend on a country s stage of economic development relative to the perfect information benchmark north south capital flows are dampened and possibly reversed and world interest rates are lower whereas riskless rates are equalized across borders the domestic loan rate is higher in poorer countries the model can be applied to a number of policy issues including the debt overhang problem the indexation of foreign public debts and the effect of income distribution on growth

liberalization and inequality in sri lanka a comment abstract paul glewwe has recently argued against the widely held view that the liberalizing policy reform in sri lanka in the late 1970s increased inequality we contend here that glewwe has not convincingly discredited the household income distribution data that he has misinterpreted the expenditure distributions and that he has not considered the welfare distributional effects of the relative price changes induced by the policy reforms furthermore we argue that a sound basis remains for the contention that the policy reforms of the late 1970s increased inequality

modeling response to advertising and pricing changes for v 8 cocktail vegetable juice this paper is based on a series of studies undertaken for v 8 cocktail vegetable juice over a five year period the studies were a consequence of management questions regarding the effectiveness of a new advertising campaign the best media mix for this campaign and the apparent wear out of the advertising copy the studies included controlled experimentation estimation of advertising response functions and exploration of price sensitivity following major price increases by v 8 it was found that the short term response to advertising was s shaped and that the new creative approach rather than expenditure levels alone accounted for by far the largest component of the impact of advertising on sales it was also found that for a short period following the major price increases v 8 became extremely price sensitive however after about six months the marginal impact of price returned to historical levels the application of results at campbell soup company their relationship to the literature and their implications for both researchers and practitioners are discussed

the shape of advertising response functions revisited a model of dynamic probabilistic thresholds prior work in marketing has suggested that advertising threshold effects levels beneath which there is essentially no sales response are rarely encountered in practice because advertising policies settle into effective ranges through early trial and error thresholds cannot be observed directly and arguments for their existence must be based primarily on a statistical footprint that is on relative fits of a range of model types to detect possible threshold effects we formulate a switching regression model with two regimes in only one of which advertising is effective mediating the switch between the two regimes is a logistic function of category specific dynamic variables e g order of entry time in market number of competitors and advertising levels nesting a variety of alternative formulations among them both standard concave and s shaped responses a sequence of comparisons among parametrically related models strongly suggests that threshold effects exist that market share response to advertising is not necessarily globally concave that superior fit cannot be attributed to model flexibility alone and that dynamic environmental competitive and brand specific factors can influence advertising effectiveness these effects are evident in two evolving durables categories suvs and minivans although not in the one mature nondurable category liquid detergent studied

repeated insurance relationships in a costly state verification model with an application to deposit insurance abstract we consider the problem of an insurer who enters into a repeated relationship with a set of risk averse agents in the presence of ex post verification costs the insurer wishes to minimize the expected cost of providing these agents a certain expected utility level we characterize the optimal contract between the insurer and the insured agents we then apply the analysis to the provision of deposit insurance our results suggest in a deposit insurance context that it may be optimal to utilize the discount window early on and to make deposit insurance payments only later or not at all

equity and bond flows to latin america and asia the role of global and country factors abstract this paper investigates the factors motivating the large capital flows to a number of developing countries in recent years we use monthly us capital flows to nine latin american and nine asian countries to analyze the behavior of bond and equity flows employing a panel data approach we find that although global factors the drop in us interest rates and the slowdown in us industrial production are important in explaining capital inflows country specific developments are at least as important especially for asia we also find that equity flows are more sensitive than bond flows to global factors but that bond flows are generally more sensitive to a country s credit rating and secondary market debt price

pulsation in a competitive model of advertising firm s cost interaction the literature reveals contradiction between theoretical results superiority of uniform policy under a concave advertising response function and empirical results concavity of the advertising response function and the superiority of a pulsation policy to reconcile the above difference this paper offers a resolution based on 1 the concavity of the advertising response function 2 the convexity of the firm s cost function and 3 over advertising the resolution is reached upon maximizing the net profit per unit time over the infinite planning horizon subject to an exogenous advertising budget constraint theoretical results for monopolistic markets are found mostly generalized to competitive markets a numerical example is introduced to gain more insight into the theoretical findings and an approach is introduced and implemented to empirically assess the shape of a firm s cost function and the advertising policy to be employed

predicting advertising pulsing policies in an oligopoly a model and empirical test given that firms pulse in advertising should firms pulse in or out of phase it is shown that out of phase maximizes the oligopoly profits and is also the markov perfect equilibrium of the infinite horizon game the basic intuition for this result comes from the following fact it is more profitable to increase consideration when the competitor s consideration is lower evidence from several product categories seems to support this theoretical result

who is credit constrained in the u s economy an important assumption of the life cycle model of consumption is the postulate of perfect capital markets this hypothesis has recently been challenged by substantial empirical evidence hall and mishkin 1982 using the panel study of income dynamics estimate that 20 percent of united states families are liquidity constrained mariger 1986 derives a life cycle model with endogenous liquidity constraints and using a cross section estimates this fraction to be 19 4 percent hubbard and judd 1986 simulate a model with a constraint on net worth which shows that with reasonable assumptions about preferences 19 0 percent of united states consumers are liquidity constrained the emerging consensus points therefore to a fraction of approximately 20 percent of the population behaving in a manner that is inconsistent with the pure life cycle model in addition hayashi 1985 and zeldes 1989 investigate the correlation among consumption wealth and income for various population groups and infer that liquidity constraints are more important for younger families with low levels of wealth and saving the main limitation of these studies is that in their data sets constrained consumers are not observable and have to be identified via indirect evidence thus there is as yet little firm evidence about the characteristics of the consumers who are likely to be credit constrained this paper adopts an approach that differs from previous tests for liquidity constraints because it makes use of data where constrained consumers are observable and explicitly links their existence to credit market imperfections and personal characteristics the data drawn from the 1983 survey of consumer finances scf and described in section ii provide information on individuals whose request for credit has been rejected by financial intermediaries in section iii a model is developed in which consumers and lenders behavior jointly determines the probability that a consumer is rationed in the credit market this probability is then

a model of advertising competition using a dynamic model of advertising rivalry between competitors in a duopoly the author obtains analytical results for the case of pure market share rivalry in a mature market a more general mod

realizing fair outcomes in minimum cost spanning tree problems through non cooperative mechanisms abstract in the context of minimum cost spanning tree problems we present a bargaining mechanism for connecting all agents to the source and dividing the cost among them the basic idea is very simple we ask each agent the part of the cost he is willing to pay for an arc to be constructed we prove that there exists a unique payoff allocation associated with the subgame perfect nash equilibria of this bargaining mechanism moreover this payoff allocation coincides with the rule defined in bergantinos and vidal puga bergantinos g vidal puga j j 2007a a fair rule in minimum cost spanning tree problems journal of economic theory 137 326 352

capital market imperfections international credit markets and nonconvergence abstract we consider a two country growth model with international capital markets these markets fund capital investment in both countries and operate subject to a costly state verification csv problem investors in each country require some external finance but also provide internal finance which mitigates the csv problem when two identical except for their initial capital stocks economies are closed they necessarily convergemonotonicallyto the same steady state output level unrestricted international financial tradeprecludesotherwise identical economies from converging and poor countries are necessarily net lenders to rich countries oscillation in real activity and international capital flows can occur journal of economic literatureclassification numbers e00 f00 f34 g14

good bye financial repression hello financial crash some unintended consequences of financial liberalization in latin america are analyzed in this paper intrinsic imperfectious in financial markets and the policy dilemmas they pose are reviewed first the stylized facts of southern cone experiments in financial liberization are then presented alternative ways of organlzing domestic capital markets under latin american conditions are discussed and an eclectic reform mongering program is proposed

domestic or global imbalances rising income risk and the fall in the us current account when default leads to exclusion from financial markets the implied loss of consumption smoothing opportunities is more costly when income volatility is high a rise in income risk thus makes default less attractive allowing creditors to relax borrowing limits i show how in an open economy this endogenous financial deepening may reduce aggregate foreign assets in response to a rise in individual income risk against the precautionary savings intuition conditions for this depend on whether default constrains complete or uncontingent contracts the post 1980 rise in us household income risk strongly reduces foreign assets when domestic markets are complete or world interest rates low

on the superiority of pulsing under a concave advertising market potential function abstract the authors study the superiority of advertising pulsing policy turning advertising on and off in a cyclic fashion over its uniform constant spending counterpart that costs the same under the assumption that sales dynamics follow a modified vidale wolfe aggregate advertising model the authors show that pulsing can be superior if the product of the concave market potential function and the linear or concave advertising response function is convex in advertising similar to previous studies in the literature the average undiscounted profit over the infinite planning horizon is considered as a performance measure according to which alternative advertising pulsation policies are compared employing a well known data set relating advertising to sales the above convexity requirement is empirically supported and the superiority of pulsing is established numerically the performance of the proposed model is found to be superior to two rival models using a one step ahead forecasting procedure the analytical findings of the study are documented into six theoretical results for which proofs are relegated to a separate appendix managerial implications of the study and directions for future research are also discussed

financial integration and growth in a risky world abstract we revisit the debate on the benefits of financial integration in a two country neoclassical growth model with aggregate uncertainty the framework accounts simultaneously for gains from a more efficient capital allocation and gains from risk sharing together with their interaction global numerical methods allow for meaningful welfare comparisons gains from integration are quantitatively small even for riskier and capital scarce emerging economies these countries import capital for efficiency reasons before exporting it for self insurance leading to capital flows and growth reversals along the transition this opens the door to richer empirical implications than previously considered in the literature

financial development growth and the distribution of income a paradigm is presented in which both the extent of financial intermediation and the rate of economic growth are endogenously determined financial intermediation promotes growth because it allows a higher rate of return to be earned on capital and growth in turn provides the means to implement costly financial structures thus financial intermediation and economic growth are inextricably linked in accord with the goldsmith mckinnon shaw view on economic development the model also generates a development cycle reminiscent of the kuznet hypothesis in particular in the transition from a primitive slow growing economy to a developed fast growing one a nation passes through a stage in which the distribution of wealth across the rich and poor widens

on financial innovations and credit market evolution abstract this paper examines the role of financial innovations in the economic development process it discusses the place of policy intervention in the financial development of developing countries and through a case study of an innovative bank illustrates the nature and characteristics of the financial innovations necessary for financing small enterprises and mobilizing resources from low and middle income groups such financial innovations are shown to reduce transaction costs and risk and as a result to bring about widening deeping and intergration of capital markets this process accelerates economic development through a favorable impact on savings investment and output

optimal advertising strategies this paper considers advertising policies for a very general class of response functions it is shown that if a pulsing policy is used awareness or sales eventually settle down to a steady cycle and the average response over the cycle is a decreasing function of the length of the cycle when response shows increasing returns to scale it is possible in theory to use a device called chattering to replace the true response by a straight line which lies above the true response in the region in which chattering is used a numerical example is given to show how the optimal policy can be computed when part of the response is linear and the results obtained are compared with those of the best practicable approximation to chattering it is shown that the problem of maximising awareness or sales subject to a budget constraint is structurally identical with maximising profit after advertising with or without a constraint in either case it is possible that for part of the time the optimal policy involves chattering

national and international aspects of financial policies in ldcs a prologue after a period of animated controversy between keynesians advocating policies of low interest rates and monetary expansion and monetarists who insisted on the importance of the distinction between nominal and real interest rates economists have now almost reached a consensus on the role of money in the development process this consensus has arisen because it was increasingly felt that what was called for was not new concepts so much as new ways of looking at them in ldcs money s role need be neither denigrated nor exaggerated money s traditional functions as a medium of exchange and a store of value remain important in ldcs but its function as a conduit of resources from savers to investors is more central to an inderstanding of its contributions to development coats and khatkhate 1980 p 3 the body of the consensus derives from the framework set up by mckinnon and shaw fleshed out by the earlier work of goldsmith and patrick goldsmith 1969 patrick 1966 and extended by the theoretical and empirical output of a large number of younger economists fry 1981 this analysis attached central importance to financial policies of higher real interest rates which were supposed to encourage the build up of real money balances increased financial intermediation and unification of financial markets eventually such a policy would lead to the efficient utilization of resources and particularly of scarce capital this new paradigm has contributed to an improved understanding and perception of the economies of ldcs their problems and how these problems are accentuated by distortions arising from interventionist policies for a while it was believed that the programme contained the secret of how to reconcile stabilization objectives with those of development roe 1982 however the accumulation of empirical evidence on several developing countries where the prescribed set of policies was adopted has raised doubts about the validity of this conclusion in the presence of distortions in the financial markets it is no doubt a sensible policy to raise real interest rates the problematic issue is how far to go raising real interest rates without any regard for the rates of return on investment may run counter to the requirements of development to argue that once funds are generated through the accumulation of real balances investment can take care of itself ignores the very dynamics of development thus the hiatus between stabilization and development has not really been bridged this is evident from the recent concern with supply side policies rather than demand management policies a dichotomy which parallels the distinction between the stabilization and development problems it is this dual distinction which provides the theme of this special issue of world development

portfolio capital flows hot or cold a distinction is often made between short term and long term capital flows the former are deemed unstable hot money and the latter are deemed stable cold money using time series analysis of balance of payments data for five industrial and five developing countries we find that in most cases the labels short term and long term do not provide any information about the time series properties of the flow in particular long term flows are often as volatile as short term flows and the time it takes for an unexpected shock to a flow to die out is similar across flows long term flows are also at least as unpredictable as short term flows and knowledge of the type of flow does not improve the ability to forecast the aggregate capital account copyright 1995 by oxford university press

some real evidence on the real bills doctrine versus the quantity theory researchers interested in testing between the real bills doctrine and the quantity theory approach to inflation in the face of rapid deficit financing money growth are confronted by an observation equivalence problem this paper identifies a data set which resolves the dilemma and tests the two inflation models the results provide clear evidence supporting the real bills doctrine that the value of assets backing money determines its value over the quantity theory i introduction one of the more interesting developments in monetary theory in the early 1980s was the re emergence of the real bills doctrine the doctrine identifies the value of assets backing the money supply as the prime determinant of the money s value its adherents claim that the monetization of worthless debt is responsible for inflation and not the increase in the money supply itself 1 that is an increase in the money supply will not lead to inflation so long as the money issue is backed by real assets sargent 1982 attributes the ends of four major inflations to exactly this phenomenon 2 in contrast the quantity theory claims that changes in the money supply should have inflationary consequences regardless of its backing the new interest in the old doctrine parallels a quite different line of work centering on what looks like a similar theme this second track focuses too on the rate of inflation and the fiscal wellbeing of the government though here the transmission mechanism from deficit to inflation is rather conventional in this essentially monetarist vision if the deficit is out of control and the monetary authority is to some degree subservient to the fiscal authority there must be some eventual monetization of the resultant debt resulting in inflation to the extent that higher rates of inflation are expected in the future higher rates of inflation may occur now 3 both lines of thought argue that a deficit that is out of control is responsible for inflation it is the transmission mechanism between this excessive deficit and the price level that distinguishes the two models the real bills doctrine proposes a radical departure from traditional monetary theory by suggesting that money is in effect efficiently priced the central bank is seen as being similar to any other financial intermediary purchasing debt and issuing liabilities and those liabilities money are then priced according to the value of the assets they were used to purchase the value of the assets backing the money thus money gets priced efficiently and its value is not determined by its relative or expected relative quantity but rather by the real characteristics of its backing that is ceterus paribus an increase in the money supply will not per se be inflationary the increase in the money supply will only be inflationary if the assets purchased with the money issue are of such low value as to reduce the average value of the assets backing the currency this paper provides some evidence in favor of the real bills vision of price level determination over the quantity theory the next section describes the observational equivalence problem confronting researchers interested in distinguishing between the real bills and quantity theory approach to inflation in the face of rapid deficit financing money growth and the institutional setting which resolves the observational equivalence dilemma section iii describes some tests designed to discriminate between these two hypotheses of the inflation process and their resuits and section iv contains my conclusions ii the observational equivalence of the real bills doctrine and the quantity theory a central theme of both of the real bills and quantity theory hypotheses is that fiscal deficits that are out of control will be inflationary though for very different reasons apart from any insight gained with regard to the inflation process testing the basic proposition that deficits are inflationary is problematic for two reasons first there is the standard problem of government accounting standards and practices in general and consequently of the appropriate definition of the fiscal deficit

some consequences of credit rationing in an endogenous growth model an endogenous growth model is developed where all investment is financed via credit extension there is also an adverse selection problem in loan markets so that in equilibrium credit rationing arises endogenously the result is that equilibrium levels of credit rationing and real growth rates are jointly determined in this context several changes in the environment can have unusual consequences for instance improvements in the technology for producing capital can reduce growth because of their adverse impacts on credit rationing for similar reasons various government investment subsidies can be growth reducing this phenomenon is often observed empirically

on continuous time optimal advertising under s shaped response continuous time monopolistic models of advertising expenditure that rely on strict response concavity have been shown to prescribe eventual spending at a constant rate however analyses of discrete analogs have suggested thats shaped response convexity for low expenditure levels may allow for the periodic optima encountered in actual practice casting the dynamic between advertising and sales in a common format an autonomous first order relationship the present paper explores extensions along three dimensions an s shaped response function the value of the discount rate and the possibility of diffusion like response supplementing the treatment by mahajan and muller 1986 a flexible class of s shaped response models is formulated for which it is demonstrated that in contrast to findings in the literature on discretized advertising models continuous periodic optima cannot be supported further a set of conditions on the advertising response function are derived that contains and extends that suggested by sasieni 1971 collectively these results both suggest a set of baseline properties that reasonable models should possess and cast doubt on the ability of first order models to capture effects of known managerial relevance

the distribution of income in sri lanka in 1969 1970 and 1980 1981 a decomposition analysis abstract in 1977 the sri lankan government implemented a comprehensive policy of economic liberalization removing many government controls on the economy and providing incentives for both foreign and domestic investment the previous policies were often justified as necessary to maintain an equitable distribution of income income data from 1969 1970 and 1980 1981 surveys indicate that inequality has increased but these data are shown to be unreliable for drawing conclusions on changes in the distribution of income expenditure data from the same surveys indicate that inequality has declined in the 1970 s both in the economy as a whole and within all sectors and ethnic groups

planning media schedules in the presence of dynamic advertising quality a key task of advertising media planners is to determine the best media schedule of advertising exposures for a certainbudget conceptually the planner could choose to do continuous advertising i e schedule ad exposures evenly overall weeks or follow a strategy of pulsing i e advertise in some weeks of the year and not at other times previous theoretical analyses have shown that continuous advertising is optimal for nearly all situations however pulsing schedules are very common in practice either the pract ice of pulsing is inappropriate or extant models have not adequately conceptualized the effects of advertising spending over time this paper offers a model that shows pulsing strategies can generate greater total awareness than the continuous advertising when the effectiveness of advertisement i e adquality varies overtime specifically ad quality declines because of advertising wearout during periods of continuous advertising and it restores due to forgetting effects during periods of no advertising such dynamics make it worth while for advertisers to stop advertising when ad quality becomes very low and wait for ad quality to restore beforestarting the next burst again as is common in practice based on the extensive behavioral research on advertising repetition and advertising wearout we extend the classical nerlove and arrow 1962 model by incorporating the notions of repetition wearout copy wearout and ad quality restoration repetition wearout is a result of excessive frequency beca use ad viewers perceive that there is nothing new to be gained from processing the ad they withdraw their attention or they become unmotivated to react to advertising information copy wearout refers to the decline inad quality due to passage of time independent of the level of frequency ad quality restoration is the enhancement of ad quality during media hiatus as a consequence of viewers forgetting the details of the advertised messages thus making ads appear like new when reintroduced later the proposed model has the property that when wearout effects are present a strategy of pulsing is superior to continuous advertising even when the advertising response function is concave this is illustrated by a numerical example that compares the total awareness generated by a single concentrated pulse of varying duration blitz schedules and continuous advertising the even schedule this property can be explained by the tension between the pressure to spend the fixed media budget quickly to avoid copy wearout and the opposing pressure to spread out the media spending over time to mitigate repetition wearout the proposed model is empirically tested by using brand level data from two advertising awareness tracking studies that also include the actual spen ding schedules the first data set is for a major cereal brand while the other is for a brand of milk chocolate such advertising tracking studies are now a common and popular means for evaluating advertising effectiveness in many markets e g millward brown narketmind in the empirical tests the model parameters are estimated by using the kalman filter procedure which is eminently suited for dynamic models because it attends to the intertemporal dependencies in awareness build up and decay via the use of conditional densities the estimated parameters are statistically significant have the expected signs and are meaningful from both theoretical and managerial viewpoints the proposed model fits both the data sets rather well and better than several well known advertising models namely the vidale wolfe brandaid litmus and trackermodels but not decisively better than the nerlove arrow model however unlike the nerlove arrow model the proposed model yields different total awareness for different strategies of spending the same fixed budget thus allowing media planners to discriminate among several media schedules given the empirical support for the model the paper presents an implementable approach for utilizing it to evaluate large numbers of alternative media schedules and determine the best set of media schedules for consideration in media planning this approach is based on an algorithm that combines a genetic algorithm with the kalman filter procedure the paper presents the results of applying this approach in the case studies of the cereal and milk chocolate brands the form of the best advertising spending strategies in each case was a pulsing strategy and there were many schedules that were an improvement over the media schedule actually used in each campaign

recent developments in dynamic advertising research a variety of continuous time differential functions have been developed to investigate dynamic advertising problems in business and economics fields since major dynamic models appearing before 1995 have been reviewed by a few survey papers we provide a comprehensive review of the dynamic advertising models published after 1995 which are classified into six categories i nerlove arrow model and its extensions ii vidale wolfe model and its extensions iii lanchester model and its extensions iv the diffusion models v dynamic advertising competition models with other attributes and vi empirical studies for dynamic advertising problems for each category we first briefly summarize major relevant before 1995 models and then discuss major after 1995 models in details we find that the dynamic models reviewed in this paper have been extensively used to analyze various advertising problems in the monopoly duopoly oligopoly and supply chain systems our review reveals that the diffusion models have not been used to analyze advertising problems in supply chain operations which may be a research direction in the future moreover we learn from our review that very few publications regarding dynamic advertising problems have considered the supply chain competition we also find that very few researchers have used the diffusion model to investigate the dynamic advertising problems with product quality as a decision variable and the pricing decision has not been incorporated into any extant lanchester model the paper ends with a summary of our review and suggestions on possible research directions in the future

anatomy of financial retardation in a less developed country the case of sri lanka 1951 1976 abstract an attempt is made in this paper to analyse the experience of sri lanka during 1951 1976 particularly in relation to its financial sector development it is shown that the interventionist regime held the key to the pace and pattern of the economy s development whether it was the skimpy growth of the financial system the faltering progression of gnp the precarious foreign exchange position or the persistence of inflationary pressure they were all traceable to the impact on the financial system of a particular set of policies pursued the year 1977 however marked a watershed in sri lanka s long quest for economic development the government began to unwind the entire paraphernalia of administered controls on consumption investment and foreign exchange most of the price controls were removed subsidies phased out and public corporations were allowed greater autonomy in their pricing and distribution policies it is necessary to contrast this situation with what existed prior to 1977 in order to assess its impact on the real economy of sri lanka only then can the cost of financial retardation be measured

nash equilibrium and welfare optimality if is a set of social alternatives a social choice rule scr assigns a subset of a to each potential profile of individuals preferences over a where the subset is interpreted as the set of welfare optima a game form or mechanism implements the social choice rule if for any potential profile of preferences 1 any welfare optimum can arise as a nash equilibrium of the game form implying in particular that a nash equilibrium exists and 2 all nash equilibria are welfare optimal the main result of this paper establishes that any scr that satisfies two properties monotonicity and no veto power can be implemented by a game form if there are three or more individuals the proof is constructive

growth and equity in developing countries a reinterpretation of the sri lankan experience in the important debate between the proponents of direct basic needs and indirect economic growth measures of promoting welfare sri lanka has frequently been cited as one country which has successfully pursued the direct approach it has raised living standards without much cost in terms of reduced growth this conclusion however is based on analyses which do not account for the initial conditions of the countries being compared after methodologically incorporating these concerns neither the improvement in living standards nor the 2 0 percent per capita growth rate during the period of direct policy measures 1960 78 was exceptional in contrast during the period of more indirect growth promoting policies 1977 84 i economic growth more than doubled to an average rate of 4 3 percent per capita per annum ii expenditure inequality did not significantly change iii consumption expenditures of the population and the poor generally increased and iv several living standard indicators continued to improve