are future taxes discounted in this paper i examine empirically the question of whether or not the public recognizes the future taxes implied by current deficitfinanced expenditures as discussed by barro 1 it seems that such recognition does not occur but that by a new hypothesis presented here the aggregate economy behaves much as if it did this alternative hypothesis relies on the widely accepted efficient markets and permanent income hypotheses and it requires considerably less sophistication and information on the part of the average economic agent than does barro s hypothesis

euler equation tests of ricardian equivalence abstract tests of ricardian equivalence based on the euler condition can be written in several mathematically equivalent ways this paper shows that these alternative solutions may give rise to different empirical results when liquidity constraints are ignored this may be due to misspecification since a crucial assumption of the model is violated or due to the different parameter restrictions imposed by the different solutions the evidence suggests that misspecification is the most likely explanation previous evidence based on restricted specifications should be interpreted with caution

government debt government spending and private sector behavior revisited comment perhaps no issue has generated as much controversy among economists in the past decade as the proposition that an increase in the government deficit induces an equal offsetting increase in private saving the truth of this so called ricardian equivalence proposition is central to whether budget deficits reduce capital accumulation to the feasibility of expansionary tax reductions and to the effects of social security on private saving and aggregate capital accumulation although the basic idea that the future tax liabilities associated with government deficits and debt induce individuals to increase their saving has been around since the time of david ricardo and was treated explicitly by don patinkin 1965 martin bailey 1971 and levis kochin 1974 the current debate was launched by robert barro 1974 the voluminous theoretical literature of recent years has shown that complete ricardian equivalence would be expected to prevail only under very special conditions see douglas bernheim 1987 for an especially useful survey and analysis but the theoretical restrictiveness of the assumptions required for complete ricardian equivalence does not constitute a practical refutation defenders of ricardian equivalence can argue that the theory is only an approximation and can claim that although the stringent conditions required for complete ricardian equivalence do not hold the economy s behavior in practice is close to the predictions of ricardian equivalence there are two key empirical questions the first is whether a higher level of taxes with government spending constant induces individuals to reduce their spending on consumption as traditional theory holds or has no effect on consumer spending as the ricardian equivalence proposition predicts the second deals with the effect of government outlays on goods and services although the absence of a negative effect on consumer spending of such government outlays is clearly contrary to the ricardian equivalence proposition the existence of a moderate negative effect of government outlays on consumer spending is not in itself evidence in favor of the ricardian equivalence proposition that individuals increase their saving to finance anticipated debt service as feldstein 1982 explained consumers may correctly believe that a rise in current government spending is a good indicator of a higher level of future government spending once a program is launched or budgets increased the process is unlikely to be reversed an increase in current government spending is therefore a good indication that future taxes will have to be higher to finance a higher level of future government spending individuals may rationally reduce their own spending when government outlays increase without a concurrent increase in taxes because they anticipate higher future taxes to finance higher future government spending even if they give little or no weight to the debt service implications of the current deficit the strongest direct evidence in favor of ricardian equivalence is roger kormendi s 1983 article in the american economic review he presents consumption regression equations that relate an estimate of consumption to net national product wealth martin feldstein is professor of economics at harvard university and president of the national bureau of economic research douglas elmendorf is assistant professor of economics at harvard university we are grateful to greg mankiw and lawrence summers for comments on an earlier draft the research reported here is part of the nber study of the government budget and the private economy ikormendi defines consumption as the sum of current expenditures on services and nondurables plus 10

new tests of the life cycle and tax discounting hypotheses abstract we first test a version of the permanent income consumption function recently suggested by barro the results support the theory except that consumption expenditures show sensitivity to transitory income next we use the consumption model to test the tax discounting hypothesis which is strongly supported this support for tax discounting disagrees with results from some earlier studies using more traditional specifications of the consumption function however we show that when certain obviously inadequate estimation procedures are corrected the traditional models also support tax discounting this uniform support for tax discounting suggests that the sensitivity of consumption to transitory income is not due to liquidity constraints

too conservative to hedge how much does a corn ethanol facility lose abstract while the process of producing ethanol from corn has been well established for over a decade the process profitability still eludes the industry investors in particular uncertainties exist in both the feedstock and the product spot prices to manage the sophisticated price uncertainty current practice in industry is to negotiate long term fixed rate prices with both the suppliers of the feedstock and the purchasers of the product although this practice completely eliminates the price uncertainty and simplifies production decisions it entails the potential loss of profit stochastic programming methods provide a framework which takes into account the uncertainties and determines the decisions that are optimal under this uncertain future therefore in this study a stochastic optimization model is presented to determine the weekly production level and swap hedging portfolios over a year s planning horizon with the objective of maximizing the process profit the approach is also used in a back testing perspective to compare the profit obtained from applying the optimal decisions with the negotiated profit derived from using the current practice this comparison in turn validates the effectiveness of the proposed model framework in particular during times of high price uncertainty

finite lifetimes and the effects of budget deficits on national saving abstract even though realistic deficit policies shift sizable tax burdens to future generations the assumption of an infinite horizon is a good approximation for analyzing a deficit s short run saving effect on individuals who are neither liquidity constrained nor myopic recent u s experience casts significant doubt on these assumptions however and appears difficult to reconcile with the ricardian equivalence proposition that the timing of taxes does not affect national saving recent deficits have coincided with reduced national saving and a substantial increase in the share of gnp devoted to consumption

the behavior of treasury securities monthly 1942 1984 abstract the monthly market value statistics on outstanding united states treasury debt are reported for the 1981 1984 period in addition a monthly series on privately held gross federal debt is reported for the extended 1942 1984 period together with monthly security price indices for various federal debt aggregates examination of the stochastic structure of t bill prices indicates that the riskiness of t bills has increased dramatically in recent years

government debt government spending and private sector behavior reply roger kormendi 1983 presents apparently strong evidence that in contrast to the standard view consumption is not reduced by taxes but is reduced by government expenditure he interprets his results as supporting a consolidated approach to private sector behavior in which consumers effectively internalize the government budget constraint specifically he claims that consumers regard government spending as the true measure of the government s claim on private resources and so do not respond to changes in taxes given spending this is basically the approach advocated by robert barro 1974 and known also as the ricardian equivalence proposition hereafter rep kormendi s results appears to contradict other empirical work based on the life cycle hypothesis for example martin feldstein 1982 modigliani 1984a sterling 1985 although results similar to his have been reported see david aschauer 1985 john seater and roberto mariano 1985 and the references in kormendi in our view kormendi s analysis is seriously flawed his heuristic derivation of the consumption function leads him to a specification of the aggregate consumption function which is not consistent with the life cycle hypothesis lch or with rep and to questionable methods of estimation once his conceptual and methodological errors are corrected his formulation and more generally the rep hypothesis are found to receive little empirical support in the next section we rely on the lch to derive an aggregate consumption function which shows explicitly how government expenditure and taxes should effect private consumption this derivation helps to bring out the observable implications of rep which are shown to be equivalent to a limiting form of the lch in which the planning horizon is infinite it also serves to clarify the appropriate specification of the variables appearing in the consumption function next section ii reports our empirical estimates and tests section iii compares our results with kormendi s finally section iv reports the results of endeavors to improve the specification of fiscal variables notably by distinguishing between permanent and transitory tax changes

is ricardian equivalence a good approximation ricardian equivalence may be a good approximation even if all households have finite horizons many households have short horizons and an appreciable fraction of wage income is received by liquidity constrained households the approximation is likely to be better the more imperfect annuity markets are

assessing ricardian equivalence this paper reviews the literature on ricardian equivalence this hypothesis may be interpreted as a generalisation to the short and the long run of the theories which put no weight on the real effects of public policies on aggregate demand we argue that ricardian equivalence relies on both permanent income hypothesis and the fulfilment of the intertemporal government budget constraint the theoretical literature emphasises several reasons for departures from this hypothesis however the empirical literature is inconclusive when ricardian equivalence is tested in a life cycle framework the hypothesis is usually rejected while when the empirical analysis is based on optimising models it is usually accepted

consumption wealth and finite horizons tests of ricardian equivalence i introduction a continuing debate in macroeconomics concerns the ability of fiscal policy to affect aggregate demand in other words if the government reduces taxes and finances a given level of government spending by issuing new bonds does it generate an increase in aggregate demand the answer to this question depends on the degree to which consumers treat government debt as net wealth under the textbook model the tax cut would raise current disposable income and cause consumers to increase spending while this spending increase may be offset to some extent by the effects of higher interest rates the net effect would be an increase in aggregate demand in contrast under ricardian equivalence interest in which was rekindled by barro s 1974 seminal paper permanent income consumers who are connected to future generations by operative inter generational transfers would not consider the current tax cut and increase in disposable income as permanent they would recognize that the government s intertemporal budget constraint implies that for a given level of government spending a tax cut now implies a tax increase in the future under certain conditions one of which is the assumption of infinite planning horizons see sweeney 1988 for a discussion of the potential importance of this and other conditions imposed in barro s model the present value of the future tax increase implied by the current tax cut would exactly equal the present value of the concomitant increase in government debt as a result consumers will save their increased disposable income to cover their future taxes and the tax cut will not affect aggregate demand put differently consumers would not treat government bonds as net wealth although many empirical tests of the ricardian proposition have appeared in the literature see seater 1993 and the literature cited therein most have used somewhat ad hoc estimating equations that do not properly nest the ricardian hypothesis with a reasonable alternative hypothesis it was not until blanchard s 1985 elegant representation of the behavior of consumers with finite planning horizons that a clear path for empirical work was delineated blanchard s paper spawned a series of empirical papers designed to test ricardian equivalence within the framework of his model which does nest both the ricardian hypothesis and a non ricardian alternative in a widely cited paper evans 1988 was the first to derive the empirical implications of blanchard s model the model reduces the test of ricardian equivalence to a test of whether wealth affects current consumption after accounting for the effect of consumption in the previous period if it does then the model implies that consumers have finite planning horizons and treat government bonds as net wealth although evans s results cannot reject ricardian equivalence they do not resolve the controversy about the ricardian hypothesis other equally well grounded empirical studies e g graham and himarios 1991 and references therein find results that favor the finite horizon interpretation in the first part of the paper we re estimate evans s 1988 model using a better approximation of the market value of wealth contrary to evans s conclusions we find that ricardian equivalence should be rejected in favor of a non ricardian alternative hypothesis in which consumers have finite planning horizons 1 our results differ from evans s primarily because our wealth measure takes account of available information on the market value of corporate equity held by households our series is markedly more volatile than evans s as a result of the decidedly larger movements in the market relative to the book value of corporate assets in the second part of the paper we test whether the long run properties of the data are consistent with our regression results in contrast to earlier work by gali 1990 we find that they are

the permanent income hypothesis estimation and testing by instrumental variables the permanent income hypothesis with rational expectation is restated estimated and tested by an instrumental variables technique on the postwar u s aggregate time series data the hypothesis is accepted on a consumption series which includes service flows from consumer durables if the consumption series is the one in the national income and product accounts the hypothesis is decisively rejected an explanation is suggested to reconcile the conflicting test results

permanent budget deficits and inflation abstract the issue of whether permanent primary budget deficits have to be monetized is re examined in a simple monetary model hybrid of the sidrauski and overlapping generations frameworks in which intergenerational effects are generated by the arrival of new infinitely lived cohorts the presence of intergenerational effects enlarges for a given fiscal policy the set of admissible monetary policies and weakens the need to monetize the deficit comparisons between the growth and interest rates are in general insufficient to predict whether increased deficit must be monetized because of the existence of both bond and money seigniorage laffer curves

government deficits and aggregate demand abstract the evidence presented in this paper indicates that changes in government spending transfers and taxes can have substantial effects on aggregate demand the estimates also indicate that the promise of future social security benefits significantly reduces private saving each the basic implications of the so called ricardian equivalence theorem is contradicted by the data the results are consistent with the more general view of the effects of fiscal actions and fiscal expectations that is described in the paper

consumers are not ricardian evidence from nineteen countries i introduction in conventional macroeconomic analysis government debt affects the economy because households view it as net wealth the larger the government debt is the wealthier households feel and the more they consume in principle however households need not view government debt as net wealth david ricardo pointed out that they might conceivably treat the future taxes servicing the government debt as exactly offsetting it 1 robert barro 1974 has shown that maximizing households will actually do so if they accurately anticipate future taxes if they face perfect capital markets and if they have effectively infinite horizons ricardian equivalence is said to hold if households do treat future servicing taxes as an exact offset to the government debt many empirical papers on consumption have investigated whether ricardian equivalence is consistent with observation kochin 1974 barro 1978 tanner 1979 seater 1982 kormendi 1983 aschauer 1985 seater and mariano 1985 kormendi and meguire 1986 1990 leiderman and razin 1988 evans 1988 and evans and hasan 1993 have reported evidence consistent with ricardian equivalence by contrast blinder and deaton 1985 feldstein 1978 1982 boskin and kotlikoff 1985 modigliani and sterling 1986 1990 and feldstein and elmendorf 1990 have reported evidence inconsistent with ricardian equivalence unfortunately most of these studies do not estimate regression equations that derive from well specified theoretical models nesting both ricardian equivalence and an alternative theory in which budget deficits and current taxes are not equivalent consequently their results are often hard to interpret moreover these studies consider the data for only one country typically the united states as a result the tests that are performed may not have much power to distinguish an economy for which ricardian equivalence would be a good approximation from one for which it would be a bad approximation olivier blanchard 1985 has provided one of the few models in the literature that tractably nests ricardian equivalence and an alternative in which households view government debt as net wealth depending upon whether a crucial parameter is zero or positive households have infinite horizons internalize all future generations and exhibit ricardian behavior or have finite horizons are at least somewhat disconnected from future generations and exhibit non ricardian behavior that strengthens as the parameter becomes larger the model has testable implications that this paper examines using annual data for nineteen countries when the data for the countries are pooled the tests have sufficient power not only to reject ricardian equivalence in favor of blanchard s alternative but also to yield a precise estimate of the deviation from ricardian equivalence this estimated deviation is approximately what one would expect if capital and insurance markets were perfect and households did not have altruistic bequest motives the deviation is however also economically unimportant for many purposes the rest of the paper is organized as follows section ii lays out blanchard s model and derives the testable implications of ricardian equivalence section iii tests these implications section iv summarizes the findings of the paper and interprets them ii empirical implications of ricardian equivalence in the stochastic variant of blanchard s model formulated in this section the economy is inhabited by a constant population of households that have finite horizons and face perfect capital and insurance markets 2 each household has a finite horizon because it has a probability p of dying each period and being replaced by another household from which it is entirely disconnected with the population normalized to unity the number of households born 0 1 2 periods earlier is always p p 1 p p 1 p sup

government debt government spending and private sector behavior a current period tax reduction financed by issuing government debt shifts the timing of tax collection from the current period to the future if the future taxes implied by government debt are not fully perceived and discounted by the private sector there will be a net wealth effect that increases private sector consumption thus reducing capital accumulation and growth if on the other hand the implied future taxes are perceived and discounted by the private sector the current period tax reduction will be used to increase private saving to pay for the future taxes and government debt will be absorbed without any real effects on the economy the effects of government spending financed by current period taxation also depend upon private sector perceptions 2 if the benefits of government spending are ignored private sector consumption will decrease in accordance with the reduction in permanent disposable income to the extent that government spending is on consumption type goods that are perceived as substitutes for privately provided consumption goods there will be a relatively greater reduction in private sector consumption to the extent that government spending is on investment type goods yielding future goods and services that are perceived as substitutes for future privately provided consumption goods there will be a relatively smaller reduction in private sector consumption the standard approach to modeling private sector consumption saving behavior involves a rather asymmetric set of assumptions as to how the private sector perceives the various elements of government fiscal policy 3 current period taxes are assumed to be fully perceived but current period government spending is implicitly assumed to be completely ignored by the private sector in considering permanent personal disposable income the private sector is assumed to be forward looking in its assessment of income and taxation the stock of government debt is nevertheless included as part of the stock of private wealth the implicit assumption associate professor of economics graduate school of business university of chicago 1101 east 58th street chicago il 60637 i thank eugene fama levis kochin michael mussa paul evans and an anonymous referee for helpful comments i am particularly grateful to daniel benjamin for contributing many hours of discussion and laura lahaye who was a research assistant and valuable adviser on earlier drafts the theoretical debate on the burden of the debt has been long standing gerald o driscoll 1977 documents ricardo s nineteenth century position robert barro 1974 reopened the debate by introducing the fundamental issue of intergenerational transfers also discussed in merton miller and charles upton 1974 the empirical side of the debate was initiated by levis kochin s 1974 attempt to test for the effects of deficits on consumption and by martin feldstein s 1974 attempt to test for the effects of social security wealth on consumption other empirical contributions include jess yawitz and laurence meyer 1976 myself 1978 and j earnest tanner 1978 1979 with respect to the effects of government deficits and debt and barro 1978 michael darby 1979 and dean leimer and selig lesnoy 1982 with respect to social security wealth see also interesting recent papers by john seater 1982 who generates detailed tests of the effects of deficits and debt on consumption charles plosser 1982 who explores the effects of government spending and debt shocks on interest rates and feldstein 1982 who attempts tests similar to some in this paper see fn 29 2martin bailey s 1962 1971 development of the effects of government spending on private consumption and aggregate economic activity is the seminal contribution paul david and john scadding 1974 extend bailey s ideas and provide some supporting empirical evidence more recently willem buiter 1977 and myself 1978 developed models based on bailey s earlier work barro 1981 has an interesting paper on related issues see also david aschauer 1982 3the standard approach incorporates fiscal policy through the concept of personal disposable income and by including the stock of government debt as part of personal wealth see for example the empirical specification of albert ando and franco modigliani 1963 which has been the basis of most empirical consumption studies since and feldstein 1974 for one of the more influential papers based on the ando modigliani specification

the effects of recent price liberalization on kenyan peri urban dairy a case study using the policy analysis matrix approach abstract when shortages of dairy products became severe in kenya early in 1992 prices of dairy products were de controlled to improve the incentives to producers the impact of that policy change is examined using the policy analysis matrix pam methodology a case study of the marketing chain involving small holder peri urban dairy producers in the nyeri region is considered the price policy reform removed only between 20 per cent and 30 per cent of the negative policy effects on most dairy producers depending on the technology used the market thus remains non competitive and a single large dairy processor was the biggest beneficiary of the policy change

are consumers ricardian when some are liquidity constrained evidence for the united states this paper formulates and estimates a revised specification of evans 1988 test for ricardian equivalence which incorporates the possible presence of liquidity constrained consumers if liquidity constrained consumers are significant in number tests using aggregate consumption data may tend to reject the ricardian equivalence hypothesis when the model allows for liquidity constraints a test which incorporated liquidity constrained consumers could not reject ricardian equivalence over the sample period 1946 91 while the proportion of aggregate consumption which is liquidity constrained is found to be significant it does not appear large enough to affect the test for ricardian equivalence

the costs of indonesian sugar policy a policy analysis matrix approach indonesian sugar policy is a complex web of contradictory policies including mandatory production price supports and fertilizer and credit subsidies the policy analysis matrix pam was developed by monke and pearson to provide a more complete perspective on social profitability and the divergence between private and social costs than other commonly used social cost benefit measures the pam is used to analyze the effects of indonesian sugar policy on sugar production in irrigated and dryland areas on java the main sugar producing region in indonesia and to identify the distribution of resource transfers

is the ricardian equivalence proposition an aerie fairy theory for europe using a theoretical model based on dynamic optimizing agents we test empirically the ricardian equivalence proposition rep for the eu 15 countries the theoretical setting allows us to obtain estimates of the structural parameters of the model and to test directly the hypothesis implied by the rep using recently developed end of sample cointegration breakdown tests we find evidence of a change in the fiscal behaviour of individuals during the last decade after the introduction of a fiscal rule namely the maastricht criteria for most countries in the sample the results concerning the direction of change are mixed

rural taxation in ethiopia 1981 1989 a policy analysis matrix assessment for net producers and net consumers abstract during the period of socialist rule 1974 1991 ethiopian agriculture was subject to an array of policy interventions this paper uses a policy analysis matrix pam approach to determine the effects of various policies on different types of households and in aggregate the analysis extends the usual use of pams by including consumption requirements and by addressing the variation in the impact of specific policies through time household models are used to quantify the effects of government intervention on both net consumers and net producers of cereals the analysis reveals that although cereal purchases were sometimes subsidized through overvaluation cereal deficit households paid high prices because of market segmentation and experienced reduced incomes due to exchange rate distortions households that tended to be surplus faced substantial indirect taxes through low producer prices results suggest that undistorted markets could enable many farms to accumulate sufficient reserves to cope with production variations but farms with average land availabilities are not sustainable given current technologies even with efficient commodity markets

competition and cooperation between supply chains in multi objective petroleum green supply chain a game theoretic approach petroleum supply chain is one of the most important and sophisticated managing missions in both developing and developed countries nowadays environmental pollution is another critical factor in designing the petroleum supply chain this importance encourages the governments to minimize the amount of environmental pollution and maximize their obtained profit simultaneously by enacting required legislations on the transportation modes and the refineries considering maximizing the job creation and each stakeholder s profit and minimizing the emission of co2 and other greenhouse gases at the same time is called sustainable petroleum supply chain which has been paid little attention despite its significance therefore the modelling of petroleum supply chain considering sustainability and pricing issues is investigated for the first time in this work and a sustainable competitive petroleum supply chain scpsc model is developed to minimize pollution while maximizing the profits and job creation this problem is a two level model the first level in scpsc is the competition between the supply chains of the government and the private sectors which is modelled by the game theory approach including nash and stackelberg equilibria the optimal price and demand for each supply chain determined in the first level are considered as the second level parameters in the second level the optimal values of the decisions in designing the petroleum supply chain will be obtained by solving mixed integer linear programming milp under the mentioned three objective functions finally the proposed model is applied to a real world case in the national iranian oil company nioc based on the results of the stackelberg equilibrium the government profits increase by 11 12 while that of the private sector decreases by 25 4 and 28 11 increasing in the government profit is due to increased demand provided by government the results show that the whole profit of the petroleum supply chain in nash equilibrium is 9 8 more than that in the stackelberg equilibrium

ricardian equivalence and the public and private saving nexus in india abstractthis study tests the ricardian equivalence theorem ret and examines the responsiveness of private saving to public saving in india most estimators do not provide support for the empirical validity of ret and long run cointegration between public and private saving the increases in household saving hhs seem to have been engendered by the provision of saving incentives institution of saving schemes self driven motivation to save and the precautionary accumulations induced by uncovered uncertainties in incomes rather than by ricardian behaviour of households the self imposed aversion to debt and debt bequest borrowing and liquidity constraints and the intertemporal smoothing of consumption have been the added catalysts that contributed to the increases in hhs the households with binding borrowing constraints inadequate or no insurance and uncovered uncertainties in incomes seem to have been saving more to pay for higher inflation tax the fiscal consolidation and generation of public s

grain marketing regulations impact on peasant production in ethiopia abstract during the past 10 years ethiopia has established an elaborate system of trade restrictions producer quotas and fixed producer prices for purchasing a substantial proportion of peasants marketable surplus recent evidence suggests that the quotas are inequitably allocated among areas and that low fixed prices reduce farmer incomes incentives to use improved inputs and grain production regulation of marketplaces and interregional grain trade have important negative effects on consumers producers and the national economy by increasing grain prices the state can stimulate production and ensure adequate supplies of grain without the need for compulsory quotas relaxing the restrictions on marketplaces and on interregional trade can benefit farmers consumers and the national economy with few costs

budget deficit persistence and the twin deficits hypothesis abstract this paper gauges the twin deficits hypothesis i e a positive causal relationship between the external and budget deficits this relationship is measured by the responses of the external deficit to changes in the budget deficit induced by blanchard s model these responses are positively affected by the birth rate and by the degree of persistence of the budget deficit empirical results for the canadian and us economies reveal that although the relevant birth rates are small the great persistence of the budget deficits yields responses that are numerically large and statistically positive this contrasts with previous tests of the twin deficits hypothesis which have never formally taken into account the stochastic properties of the budget deficit

are consumers ricardian evidence for the united states this paper derives three empirical implications of a well specified model of consumer behavior a model that nests both ricardian equivalence and an alternative non ricardian theory ricardian equivalence is then tested against this alternative the tests reveal that ricardian equivalence cannot be rejected

government debt government spending and private sector behavior reply and update the preceding articles by martin feldstein and douglas elmendorf and by franco modigliani and arlhe sterling give us a welcome opportunity to return to the effects of fiscal policy on private consumption at stake in this debate we believe is a potential paradigm change from what kormendi 1983 termed the standard approach which bases private consumption on disposable personal income to what he termed the consolidated approach which bases consumption on aggregate income government spending and transfer payments each with separate effects the standard approach excludes ricardian equivalence a priori the consolidated approach not only incorporates ricardian equivalence but in its augmented form allows one to nest the various hypotheses associated with the two approaches feldstein and elmendorf argue that kormendi s 1983 results and implicitly those of kormendi and meguire 1986 which reject the standard approach in favor of the consolidated ricardian alternative are not robust to the exclusion of data from world war ii and other specification changes modigliani and sterling argue that accounting for temporary taxes reverses our rebuttal of their 1986 comment we first take up the challenge of feldstein and elmendorf before turning to modigliani and sterling we then assess the validity of our preference for estimating in differences by testing whether consumption income and the fiscal variables are cointegrated finally we summarize what can be learned from the debate i feldstein and elmendorf

blanchard s model of consumption an empirical study this article derives several empirically testable implications for blanchard s consumption model which has been widely used in analytical macroeconomic research cointegration methods are applied the parameter that measures the life horizon of households is estimated and the consumption model is tested quarterly canadian data are used there is no empirical evidence against the assumption that households behave as if they live forever within blanchard s framework blanchard s model of consumption is strongly rejected by the data however

asymmetry in the effects of monetary and government spending shocks contrasting evidence and implications magda kandil 1 introduction recent research on business cycles has produced evidence that demonstrates the asymmetric effects of monetary shocks on economic variables 1 specifically the effect of expansionary monetary shocks on economic variables may be different from that of contractionary shocks the empirical evidence has stimulated efforts to provide an adequate theoretical explanation to the observed asymmetry sources of asymmetry have varied sharply in the theoretical literature primary explanations may be classified into supply side and demand side sources of asymmetry a strand of the theoretical literature has viewed asymmetry of economic fluctuations to be a supply side phenomenon demand shifts along a kinked supply curve are likely to produce varying effects on the economy as to the explanation of the kinked shape of the supply curve competing models offer explanations in one direction some have explained the asymmetric shape of the supply curve by conditions in the labor market this possibility arises in the context of models that advocate the contractual nominal wage rigidity explanation of business cycles the stipulation of wage contracts may allow for asymmetric wage indexation for example if wages are more responsive to expansionary demand shocks compared to contractionary shocks asymmetric wage indexation is consistent with a kinked supply curve in labor and output markets consequently expansionary demand shocks are likely to move the economy along a steeper supply curve 2 alternatively supply side asymmetry may be attributed to conditions in the p roduct market that differentiate price adjustment in the upward and downward directions faced with menu costs firms may be inclined for more frequent and larger adjustments of prices in the upward compared to the downward direction this possibility also is consistent with a steeper supply curve in the face of positive demand shocks compared to negative shocks 3 another line of the theoretical explanations of asymmetric economic fluctuations has emphasized possible asymmetry on the demand side of the economy conditions in the money and or goods markets may differentiate the response of aggregate demand to positive and negative shocks 4 this possibility differentiates the size of aggregate demand shifts in the face of expansionary and contractionary shocks in the absence of supply side asymmetry demand side asymmetry differentiates the severity of economic fluctuations in the face of positive and negative shocks the primary difference between demand side and supply side explanations concerns the output and inflationary effects in response to asymmetry supply side asymmetry produces a trade off between the asymmetric effects of demand shocks on output and their inflationary effects on wages and or prices the response of output growth is larger in the face of demand contraction compared to expansion concurrently the inflationary effect of demand shifts exceeds the deflationary effect on nominal wage and or price in contrast demand side asymmetry produces a positive correlation between the asymmetric effects of demand shocks on real output growth and nominal wage and price inflation that is larger output contraction relative to expansion correlates with smaller inflation relative to deflation of the nominal wage and price in the face of demand shocks the purpose of this investigation is to contrast asymmetry on the demand and supply sides in the face of two specific demand shocks monetary and government spending shocks demand and or supply conditions may differentiate the expansionary and contractionary effects of monetary and fiscal policies the article s analysis will highlight the specifics of this asymmetry the empirical evidence sheds some light on potential explanations of this asymmetry as follows conditions in the credit market and the behavior of ricardian consumers may differentiate the effects of expansionary and contractionary government spending shocks on aggregate demand

charles k rowley william f shughart ii and robert d tollison eds the economics of budget deficits the international library of critical writings in economics 153 ed by mark blaug cheltenham u k and northampton ma u s a edward elgar 2002 2 vols 1 112 pages usd 370 00 gbp 245 00 cloth

optimal crude oil procurement under fluctuating price in an oil refinery abstract in this paper we study the optimal procurement and operation of an oil refinery the crude oil prices follow geometric brownian motion processes with correlation we build a multiperiod inventory problem where each period involves an operation problem such as separation or blending the decisions are the amount of crude oils to purchase and the amount of oil products to produce we employ approximate dynamic programming methods to solve this multiperiod multiproduct optimization problem numerical results reveal that this complex problem can be approximately solved with little loss of optimality further we find that the approximate solution significantly outperforms a set of myopic policies that are currently used

financial risk management in the planning of refinery operations abstract most models for refinery planning are deterministic that is they use nominal parameter values without considering the uncertainty this paper addresses the issue of uncertainty and studies the financial risk aspects the problem addressed here is that of determining the crude to purchase and decide on the production level of different products given forecasts of demands the profit is maximized taking into account revenues crude oil costs inventory costs and cost of unsatisfied demand the model developed in this paper was tested using data from the refinery owned by the bangchak petroleum public company limited thailand the results show that the stochastic model can suggest a solution with higher expected profit and lower risk than the one suggested by the deterministic model