conditional asymmetries in real gnp a seminonparametric approach two critical assumptions are often made in empirical research regarding the relationship between economic variables and economic disturbances linearity and gaussianity together these two assumptions place strong restrictions on the time series behavior of a model most important these restrictions imply conditional symmetry using seminonparametric snp techniques this article presents evidence that real gross national product growth displays conditional asymmetry although these results confirm related results of brock and sayers sichel and hamilton the snp approach is novel in that it emphasizes the relationship between common modeling assumptions and the restrictions that these assumptions place on data

oil and the macroeconomy a markov state switching approach this paper analyzes the relationship between oil price shocks and postwar u s business cycle fluctuations the authors develop a generalized markov switching model of output that includes a measure of net real oil price increases and examine the capabilities of this variable to generate shifts in the mean of gdp growth and to predict transitions between dichotomous growth phases the results indicate that while the behavior of oil prices has been a contributing factor to the mean of low growth phases of output movements in oil prices generally have not been a principal determinant in the historical evidence of these phases copyright 1997 by ohio state university press

empirical investigation of one opec country s successful non oil export performance abstract this study examines indonesian non oil export success between 1975 and 1994 with a focus on the role of exchange rate management and trade policy in export performance across sectors to examine the link between export quantity and changes in policy i estimate structural export supply functions that are derived from utility and profit maximization behavior the results indicate that non oil exporters respond positively to improved price incentives including exchange rate devaluation with the strongest impact in textiles garments and sawnwood the study offers a richer description than previous work of the relationship between price incentives and export performance

energy consumption at business cycle horizons the case of the united states in this paper we propose a simple extension to a keynesian type macro model by augmenting it with energy consumption we show the relationship between energy consumption and output in a macroeconomic setting and ask the question do permanent shocks dominate changes in energy consumption and output at business cycle horizons for the united states to achieve the goal of this paper we undertake a variance decomposition analysis of shocks based on a common trend and common cycle framework within a vector error correction model our main finding is that permanent shocks explain the bulk of the variations in energy consumption and output at business cycle horizons for the united states

oil price shocks and the macroeconomy this paper examines the impact of oil price shocks and attempts to explain why the rise in oil prices up to 2008 had little impact on the world economy it makes three main arguments first that oil prices have never been as important as is popularly thought second that the most important route through which oil prices affect output is monetary policy when oil prices pass through to core inflation monetary authorities raise interest rates slowing growth based on the second argument the third argument is that high oil prices have not reduced growth in recent years because they no longer pass through to core inflation so the monetary tightening previously seen in response to high oil prices is absent it also argues that oil prices had little impact on the global recession of 20089

the effect of 107th opec ordinary meeting on oil prices and economic performances in japan abstract the aim of this paper is to show the influence of the 107th opec ordinary meeting meeting and investigates the relationships between oil prices and economic activities using an exponential generalized autoregressive conditional heteroskedasticity egarch and a vector autoregressive var model from 1991 to 2008 in japan we find that levels and volatilities of oil prices increase after the meeting we examine the effects of it on japanese economic activities employing a granger causality test and data before and after it the empirical result reveals that each price of regular gasoline and diesel has information to be useful to predict the economy after the meeting on the other hand volatilities of regular gasoline and diesel price have information to predict the inflation and economic growth before the meeting respectively after the meeting however these volatilities change to be useful to predictive both inflation and economic growth thus we conclude that the decision of meeting is related to not only the domestic oil prices but also the macroeconomy

the role of energy in real business cycle models abstract this paper modifies hansen s 1985 analysis of a real business cycle mode with indivisible labor by explicitly including energy as a productive input and modelling the relative price of energy as an exogenous random process one goal is to determine the extent to which the introduction of energy price shocks reduces the reliance of the real business cycle model on unobserved technology shocks the other goal following christiano and eichenbaum 1991 is to compare the correlation between real wages and hours predicted by the energy inclusive model to that predicted by hansen s model

the effects of oil price shocks on the iranian economy abstract the iranian economy is highly vulnerable to oil price fluctuations this paper analyzes the dynamic relationship between oil price shocks and major macroeconomic variables in iran by applying a var approach the study points out the asymmetric effects of oil price shocks for instance positive as well as negative oil price shocks significantly increase inflation we find a strong positive relationship between positive oil price changes and industrial output growth unexpectedly we can only identify a marginal impact of oil price fluctuations on real government expenditures furthermore we observe the dutch disease syndrome through significant real effective exchange rate appreciation

oil shocks and financial systemic stress international evidence abstract by conducting a structural var analysis on the financial systemic stress in 20 countries this paper provides international evidence that oil structural shocks impact not only stress in individual financial markets but also their connectedness the oil structural shocks explain a large fraction of the variation in the connectedness among various financial markets the effect of oil structural shocks on financial systemic stress is largely dependent on the origins of oil price changes and a country s net oil export position in most oil importing economies financial systemic stress is negatively impacted by supply and aggregate demand shocks and positively impacted by oil market specific demand shocks opposite patterns are detected in oil exporting economies the effects of the spillovers are asymmetrically related with market conditions during normal periods more risks are spilled over from the oil market to financial systems but during financial crises the opposite occurs in periods of financial crises and oil price collapses there is noticeable contagion between the oil market and financial systems

unpacking the meaning of market access evidence from rural kenya summary this paper critically examines the dimensions of market access using farm panel survey data from kenya we investigate changes in ten indicators of market access during the 1997 2010 post liberalization period we find major improvements in certain market access conditions and little change in others there is generally low correlation between alternative indicators of market access all purpose indicators may not accurately reflect specific market access conditions of interest distances to physical infrastructure are often not representative of farmers access to markets changes in specific market access conditions may have more to do with the behaviors of marketing agents we consider the implications of these findings for agricultural marketing policies and for research methods

price transmission and trader entry in domestic commodity markets abstract using detailed data from three simultaneous surveys of producers traders and exporters this paper examines the transmission of international coffee prices through the domestic value chain in uganda we find that producer price fluctuations are inconsistent with constant transaction costs we investigate three possible explanations for this finding storage and contango marketing costs that increase with price and trader entry that raises search time we test and reject the storage and marketing costs explanation but we find some evidence of trader entry in response to a rise in export price our findings suggest that small itinerant traders enter in response to an export price increase probably taking advantage of farmers ignorance of the rise in wholesale price

the nexus between oil price and russia s real exchange rate better paths via unconditional vs conditional analysis abstract instead of analyzing the causality between two time series unconditional analysis as it is usually done the present study deals with the nexus between oil price and russia s real exchange rate conditioning upon potential control variables at well specified horizons and on a frequency by frequency basis this research accounts also for the possible transient linkages and signal discontinuities a major finding of this paper is deeply suggestive of a sharp causality running from oil price to real exchange rate in lower frequencies this implies that russia should better tackle with turbulence triggered by oil price and continue to reduce its energy dependency via drastic and proactive measures the economic and fiscal initiatives of putin administration may help to cope with sudden shocks to lessen the great oil dependence and to build confidence needed for economic recovery while our research does not say much about the routes through which oil price may affect differently real exchange rate it clearly indicates the presence of short term relationship conditional to gdp government expenditures terms of trade and productivity differential the conditional analysis and signal detection appear as meaningful exercises to find new insights into the focal issue

renewable energy oil prices and economic activity a granger causality in quantiles analysis this paper analyzes the causal relationship between renewable energy consumption oil prices and economic activity in the united states from july 1989 to july 2016 considering all quantiles of the distribution although the concept of granger causality is defined for the conditional distribution the majority of papers have tested granger causality using conditional mean regression models in which the causal relations are linear we apply a granger causality in quantiles analysis that evaluates causal relations in each quantile of the distribution under this approach we can discriminate between causality affecting the median and the tails of the conditional distribution we find evidence of bi directional causality between changes in renewable energy consumption and economic growth at the lowest tail of the distribution besides changes in renewable energy consumption lead economic growth at the highest tail of the distribution our results also support the unidirectional causality from fluctuations in oil prices to economic growth at the extreme quantiles of the distribution finally we find evidence of lower tail dependence from changes in oil prices to changes in renewable energy consumption our findings call for government policies aimed at developing renewable energy markets to increase energy efficiency in the u s

middlemen and peasants in rice marketing in the philippines abstract this paper reports the results of a field survey covering all links in the channel of rice marketing from farmers to consumers in laguna province philippines the survey revealed a highly competitive nature of rice marketing in this area where the countless number of middlemen compete in the procurement of paddy from farmers for rice mills leaving little room for monopoly monopsony exercises intense competition was also found in wholesaling by mills to retailers as well as retailing to consumers

oil and the macroeconomy since world war ii all but one of the u s recessions since world war ii have been preceded typically with a lag of around three fourths of a year by a dramatic increase in the price of crude petroleum this does not mean that oil shocks caused these recessions evidence is presented however that even over the period 1948 72 this correlation is statistically significant and nonspurious supporting the proposition that oil shocks were a contributing factor in at least some of the u s recessions prior to 1972 by extension energy price increases may account for much of post opec macroeconomic performance

crude oil and the macroeconomy tests of some popular notions a note perhaps no other economic events in the post world war ii era have generated as much attention as the series of crude oil price shocks that have jolted the world economy since the opec boycott of 1973 a tremendous amount of space in the popular and professional literature has been devoted to analyzing the impacts of these shocks on the developed economies and the adjustments these shocks have induced one residual of this literature has been a general impression that since 1973 the functional relationship between crude oil prices and the developed macroeconomies has been dramatically and fundamentally altered yet to our knowledge no one has formally tested this impression recent evidence of hamilton 1983 suggests that crude oil prices had a strong impact on the u s business cycle well before 1973 further while textbook treatments of oil price shocks tend to highlight cost push inflationary effects the research of berndt and wood 1975 1979 and wilcox 1983 indicates the net complementarity between energy and capital in the u s economy is quite strong both before and after 1973 thus oil price shocks may have stronger real effects than generally believed in this paper we formally test three popular notions associated with the so called

economic growth inflation and oil shocks are the 1970s coming back this article analyses the relationship between oil price shocks and the macroeconomic evolution of the group of seven g7 countries using the qu and perron 2007 methodology we endogenously identify three breaks in the nonlinear relationship across our 1970 to 2008 sample we compute long term multipliers and find that the response of output and inflation to oil price shocks is greatest in the 1970s and progressively disappears until the late 1990s in contrast to the previous literature we observe that both effects reappear in the 2000s especially on inflation nevertheless the transmission of oil price shocks to the economy is weaker than in the 1970s which means that oil price shocks have lost some of their explanatory power precisely identifying these effects is crucial for the design of adequate economic measures to control or smoothen them

food marketing and pricing policy in eastern and southern africa a survey abstract this article surveys the empirical record of grain marketing and pricing policy in eastern and southern africa over 1930 1995 the paper addresses five key issues with major implications for food policy throughout africa a why the anticipated supply response to market liberalization has not yet occurred b why the common assumption of state taxation of farmers to support a cheap food policy does not apply in most of the countries in the region c why the temporary successes of the state led approach to stimulating smallholder grain production were unsustainable d why the elimination of government food subsidies associated with market reform has not adversely affected consumers and e why the fiscal cost of the marketing systems at least initially worsened rather than improved after the reforms were implemented in most countries the key future challenges for marketing policy are how to develop coordinated and financially sustainable input finance and commodity marketing systems for raising productivity growth in smallholder agriculture while overcoming inherited agricultural dualism and how to mitigate the effects of food price instability in a cost effective manner

is the business cycle characterized by deterministic chaos abstract tests are conducted on u s macroeconomic data for the presence of low dimensional deterministic chaos where deterministic chaos is defined as in grandmont s 1985 walras bowley lecture or in brock 1986 the idea is to test for evidence of endogenous instability causing the business cycle low order autoregressions are hard to reject with our methods evidence of chaos is weak but our tests may be too weak to detect it evidence of nonlinearity is present in employment 1950 i to 1983 iv unemployment 1949 i to 1982 iv monthly post war industrial production and pig iron production 1877 1937

the effects of crude oil shocks on stock market shifts behaviour a regime switching approach abstract in this paper we develop a two regime markov switching egarch model introduced by henry henry o 2009 regime switching in the relationship between equity returns and short term interest rates journal of banking and finance 33 405 414 to examine the relationship between crude oil shocks and stock markets an application to stock markets of uk france and japan over the sample period january 1989 to december 2007 illustrates plausible results we detect two episodes of series behaviour one relative to low mean high variance regime and the other to high mean low variance regime furthermore there is evidence that common recessions coincide with the low mean high variance regime in addition we allow both real stock returns and probability of transitions from one regime to another to depend on the net oil price increase variable the findings show that rises in oil price has a significant role in determining both the volatility of stock returns and the probability of transition across regimes

currency forecast errors and carry trades at times of low interest rates evidence from survey data on the yen dollar exchange rate abstract using survey expectations data and a variant of the uncovered interest rate parity uirp this paper evaluates the relationship between interest rates and investors forecast errors about the yen dollar exchange rate this study therefore is related to the forward premium puzzle and the currency carry trade strategy using relatively short i e 1 to 6 month ahead forecast data we obtain the following results first with the same forecast horizon exchange rate forecasts are homogeneous among different industry types but within the same industry exchange rate forecasts differ if the forecast time horizon is different second while forecast errors are found to be partly driven by interest rate spreads evidence against the uirp is provided consistent with this finding our coefficients on interest rate spreads obtained from nonlinear models provide indirect evidence of the yen carry trade in particular unlike theoretical predictions the carry trade is found to be active during financial turmoil and when there is a clear indication that the interest rate will be low in the future

regime switching in stochastic models of commodity prices an application to an optimal tree harvesting problem abstract this paper investigates whether a regime switching model of stochastic lumber prices is better for the analysis of optimal harvesting problems in forestry than a more traditional single regime model prices of lumber derivatives are used to calibrate a regime switching model with each of two regimes characterized by a different mean reverting process a single regime mean reverting process is also calibrated the value of a representative stand of trees and optimal harvesting prices are determined by specifying a hamilton jacobi bellman variational inequality which is solved for both pricing models using a implicit finite difference approach the regime switching model is found to more closely match the behavior of futures prices than the single regime model in addition analysis of a tree harvesting problem indicates significant differences in terms of land value and optimal harvest thresholds between the regime switching and single regime models

the effects of price deregulation on maize marketing margins in south africa abstract there has been continuous controversy over the impact of food market reforms on food security in africa in south africa the government and media have often questioned the effects of price deregulation of maize meal the major staple food on consumers this article determines the effect of retail price deregulation on the size of maize milling retail margins in south africa regression models of monthly milling retail margins are run from the period may 1976 to december 2004 to assess the robustness of our findings we estimate several different models of structural change vary the sample period to examine the sensitivity of findings to unusual weather and market conditions in the region during episodes between 2001 and 2004 and run the models using different estimation techniques ols with newey west robust estimators and feasible general least squares in virtually all models the results indicate that real maize milling retailing margins in south africa have increased by at least 20 since the deregulation of retail prices in 1991 moreover there is evidence of trend growth in the size of the milling margin over time simulations indicate that the deregulation of maize meal prices has entailed a transfer of at least us 179 million year from consumers to agents in the marketing system further study is needed to understand why this outcome in south africa differs from findings in other countries in the region concerning the effects of reform on food marketing margins

are economic time series asymmetric over the business cycle it has long been argued that major cyclical variables such as the unemployment rate display an asymmetric behavior over various phases of the business cycle the paper provides a statistical test for this hypothesis using the framework of finite state markov processes i implement a test to see if the behavior of the unemployment rate is characterized by sudden jumps and slower drops it is argued that the framework provided in the paper can also be used to test other sample path properties of economic time series

the comparative homogeneity of the east asian nic exports of similar manufactures abstract the four tigers south korea hong kong taiwan and singapore serve as a model for successful export driven growth this paper examines the degree to which their export growth followed similar or divergent patterns in response to income and price changes differing responses were found in general to characterize export growth of these four countries however similar patterns were found to describe the exports of certain sophisticated research and development r d intensive products several explanations are posited and empirically examined

price of oil and world inflation and recession new evidence shows that the commonly held assumption that the 1973 74 oil price increase directly affected us and world inflation and subsequent recession is consistent with the empirical data an extended lucas varro real income equation applied to the us united kingdom canada france germany italy japan and the netherlands gives mixed results partly because of price control and decontrol programs simulation experiments on the price control variable using us data finds strong effects further studies can be made when consistent international data is available for the 1979 80 period 18 references 4 figures 3 tables dck

the structure of indigenous food crop markets in sub saharan africa the rice market in uganda abstractusing data obtained from a series of nation wide market surveys in uganda this article attempts to document and assess the domestic rice market at all stages in the post harvest marketing chain from the farm gate to metropolitan area retail outlets the criteria used are quantities marketed prices marketing margins marketing costs and net returns to traders the results show that the regional rice markets are integrated into the national market and that on average little surplus is left for rice traders at all market stages if marketing costs are accounted for the spontaneously developed indigenous crop market works reasonably well

a wavelet analysis of mean and volatility spillovers between oil and brics stock markets this paper investigates the spillover effects of volatility and shocks between oil prices and the brics stock markets using multivariate approach and wavelet analysis at different time horizons hence we combine a multivariate arma garch model and wavelet multiresolution analysis to study this phenomenon a bivariate arma 1 1 garch 1 1 cdcc student t model was joined with modwt filter to capture a broad range of possible spillover effects in mean and variances of level prices at various time horizons generally empirical results provide strong evidence of time varying volatility in all markets under study however our proposed approach shows that oil price and stock market prices are directly affected by their own news and volatilities and indirectly affected by the volatilities of other prices and wavelet scale the results show also that mean and volatility spillover effects was decomposed into many sub spillovers on different time scales according to heterogeneous investors and market participants the practical implications of this study are critical innovative and useful for the local and international investors and also for the portfolio managers they can utilize this study to formulate the optimal oil bricks stock portfolios as well as lead to more accurate predictions of volatility spillovers patterns also in developing their hedging strategies

oil price shocks and stock markets in the u s and 13 european countries abstract oil price shocks have a statistically significant impact on real stock returns contemporaneously and or within the following month in the u s and 13 european countries over 1986 1 2005 12 norway as an oil exporter shows a statistically significantly positive response of real stock returns to an oil price increase the median result from variance decomposition analysis is that oil price shocks account for a statistically significant 6 of the volatility in real stock returns for many european countries but not for the u s increased volatility of oil prices significantly depresses real stock returns the contribution of oil price shocks to variability in real stock returns in the u s and most other countries is greater than that of interest rate an increase in real oil price is associated with a significant increase in the short term interest rate in the u s and eight out of 13 european countries within one or two months counter to findings for the u s and for norway there is little evidence of asymmetric effects on real stock returns of positive and negative oil price shocks for oil importing european countries

historical energy price shocks and their changing effects on the economy abstract the purpose of this paper is to identify the changes in the impact of energy shocks on economic activity with an interest in assessing if an economy s vulnerability and resilience to shocks improved with economic development using data on the united kingdom over the last three hundred years the paper identifies supply aggregate demand and residual shocks to energy prices and estimates their changing influence on energy prices and gdp the results suggest that the impacts of supply shocks rose with its increasing dependence on coal and declined with its partial transition to oil however the transition from exporting coal to importing oil increased the negative impacts of demand shocks more generally the results indicate that improvements in vulnerability and resilience to shocks did not progress systematically as the economy developed instead the changes in impacts depended greatly on the circumstances related to the demand for and supply of energy sources if these experiences are transferable to future markets a transition to a diversified mix of renewable energy is likely to reduce vulnerability and increase resilience to energy price shocks

energy price slump and policy response in the coal chemical industry district a case study of ordos with a system dynamics model we employ system dynamics method towards a coal chemical industry district economy evolution model using coal industry the coal chemical industry their downstream industries and the manufacture related service industry moreover we construct energy price and policy response scenarios based on ordos management experience the results show that the energy price slump had a negative impact on the overall economic development of the coal chemical industry district despite promoting non resource industries furthermore policies had different effects on the industry s output value and profit in the long term developing alternative industries ai helps increase the industrial output value and profit decreasing value added tax vat has immediate results and a distinctive effect on industrial short term production value and profit its long term effect being limited the effect of production limit pl on industrial profit is stronger than output value and financial support fs is more conducive to improve the latter however coal mining and coal chemical loan increases decrease the gross industrial profit level technology innovation ti has the best individual policy overall effect on production value and profits furthermore the simultaneous implementation of pl ti and ai can generate the synergy effect for each of them and the simultaneous implementation of vat and one or couple of other policies will generate the crowding out effect both for vat and other policies

the impact of oil shocks on the spanish economy abstract this paper analyses the impact of oil price shocks on both the gdp growth and on inflation in the economy of spain and its seventeen regions the qu and perron 2007 and the bai and perron 1998 2003a and 2003b methods identify different periods across the sample evidence of a diminishing effect of oil price shocks on gdp growth and on inflation is found from the 1970s until the mid 1980s however in contrast with previous literature we find a renewed effect on both these macroeconomic variables after the mid 80s in spain it recovers some of its initial importance in the second half of the 1990s for gdp and between 1986 and 1994 and the 2000s for inflation in the regions the influence of oil price shocks on the gdp progressively disappears while the impact on inflation decreases from 1986 onwards but becomes significant again ten years later the most outstanding result is that oil price movements explain at least some of the recent inflation therefore policy measures to control the economic impact of oil shocks should be implemented in the future

can opec cause inflation and recession abstract this paper addresses an issue that has been the subject of debate in the media and in academic circles the issue concerns the effect of higher oil prices initiated by opec on economic activity in oecd countries results of cointegration tests indicate that there is no long run relationship between oil prices and macroeconomic variables in oecd countries however causality testing indicates the existence of unidirectional causality from oil prices to domestic prices and output

this is what happened to the oil price macroeconomy relationship abstract many of the quarterly oil price increases observed since 1985 are corrections to even bigger oil price decreases the previous quarter when one looks at the net increase in oil prices over the year recent data are consistent with the historical correlation between oil shocks and recessions

food marketing liberalization and trader entry evidence from madagascar abstract food marketing liberalization was expected to induce massive trader entry and competitive markets in africa despite evidence of trader entry enterprise expansion remains difficult and many claim market power persists though perhaps in different hands this paper confronts this puzzle of substantial market entry that might not foster competition data from madagascar reveal distinct groups within rural food marketing channels separated by intraindustry mobility barriers that limit entry to a few niches moreover individuals place within the rural marketing network is defined largely by a priori social identity so the experience of food marketing liberalization varies across socially distinct subpopulations

stabilizing food markets in eastern and southern africa a major challenge for agricultural policy in africa is how to address the market instability related causes of low farm productivity and food insecurity this paper highlights structural changes affecting the behavior of food markets in eastern and southern africa and discusses their implications for the design of strategies to stabilize food prices these changes include 1 an increasing trend in maize prices toward import parity levels reflecting an emerging structural maize deficit in much of the region 2 increasingly diversified food consumption patterns in both rural and urban areas 3 highly concentrated marketed maize surplus which have largely unrecognized implications for the magnitude of price risk faced by most farm households and 4 the strategic interactions between private and public marketing actors leading in some cases to heightened market instability and food crises in the prevailing dual market environment now characterizing most of the region greater coordination transparency and consultation between private and public market actors is needed to achieve reasonable levels of food price stability and predictability

local revenue hills evidence from four u s cities we provide estimates of the effects and long run elasticities of the tax base with respect to tax rates for four large u s cities houston property taxation minneapolis property taxation new york city property general sales and income taxation and philadelphia property gross receipts and wage taxation results suggest that three of our cities are near the peaks of their revenue hills minneapolis is the exception a significant negative effect of a balanced budget increase in city property tax rates on the city property base is interpreted as a capitalization effect and suggests that marginal increases in city spending do not provide positive net benefits to property owners estimates of the effects of taxes on city employment levels for new york city and philadelphia the two cities for which employment series are available show the local income and wage tax rates have significant negative effects on city employment levels cuts in these tax rates are likely to be an economically cost effe

spatial price transmission and asymmetry in the ghanaian maize market abstract this paper utilizes recently developed threshold cointegration tests that allow for asymmetric adjustment toward a long run equilibrium relationship to examine price linkages between principal maize markets in ghana unlike previous studies the approach employed here assumes that economic agents only act to move the system back to equilibrium when the deviation from equilibrium exceeds a critical threshold whereby the benefits of this adjustment exceed the costs the findings indicate that major maize markets in ghana are well integrated both the threshold cointegration and asymmetric error correction models reveal that wholesale maize prices in local markets accra and bolgatanga respond more swiftly to increases than to decreases in central market techiman prices accra prices are found to react faster than bolgatanga prices to changes in techiman market prices

rice marketing systems in the philippines and thailand do large numbers of competitive traders ensure good performance abstract rice marketing margins are substantially greater in the philippines than in thailand despite many similarities between the two systems and despite the fact that philippine rice marketing has a competitive structure we found that rice marketing costs in the philippines are higher than in thailand mainly due to higher interest rates in the financial system other fundamental factors that also result in higher costs include endowments of water and land rice price and trade policy road quality and lack of non farm job growth however the greater costs can only account for about a fourth of the difference in gross margins implying much higher returns to management in the philippines despite similar levels of risk and no evidence of collusion the excess profits in the philippine marketing system suggest there is much to learn about how developing country commodity markets with competitive structures function in actual practice

exploring the logic behind southern africa s food crises summary government action during food crises in southern africa frequently exacerbates the problems driving food staple prices well beyond import parity we argue that an inability to make credible commitments due largely to a lack of trust between public and private sectors contributes to this dynamic empirical policy analysis can facilitate resolution only within a consultative process involving a broad range of stakeholders the policies emerging from such a process are not likely to approximate first best recommendations yet the precise policies may be less important than the fact that they exist and that main stakeholders find them credible

food price volatility in sub saharan africa has it really increased the food price crisis of 2007 2008 and recent resurgence of food prices have focused increasing attention on the causes and consequences of food price volatility in international food markets and the developing world particularly in sub saharan africa in this paper we examine the patterns and trends in food price volatility using an unusually rich database of african staple food prices we find that international grain prices have become more volatile in recent years 2007 2010 but no evidence that food price volatility has increased in the region this contrasts with the widespread view that food prices have become more volatile in the region since the global food crisis of 2007 2008 in addition the results suggest that price volatility is lower for processed and tradable food than for nontradable food that volatility is lower in the major cities than in secondary cities and that maize price volatility is actually higher in countries with the most active intervention to stabilize maize prices these findings suggest that greater attention should be given to the high level of food prices in the region rather than volatility per se that regional and international trade can play a useful role in reducing food price volatility and that traditional food price stabilization efforts may be counterproductive

oil and the macroeconomy when prices go up and down an extension of hamilton s results in an important paper hamilton 1983 demonstrated a strong correlation between oil price changes and gross national product growth in u s data however his study pertained to a period in which all the large oil price movements were upward and thus it left unanswered the question whether the correlation persists in periods of price decline moreover the price variable he used was somewhat distorted by price controls in the 1970s this note investigates whether hamilton s results continue to hold when the sample is extended to include the recent oil market collapse and the oil price variable is corrected for the effects of price controls particular attention is given to the possibility of asymmetric responses to oil price increases and decreases as suggested in the structural employment literature loungani 1986 davis 1987 hamilton 1988 like hamilton i based my investigation on the gnp equation in sims s 1 980b six variable quarterly vector autoregressive model

false promise or false premise the experience of food and input market reform in eastern and southern africa abstract the literature on the effects of agricultural market reform in africa is sharply divided and inconsistent this article attempts to reconcile opposing viewpoints on the effects of food and input market policy reform in eastern and southern africa drawing from studies of ethiopia kenya malawi zambia and zimbabwe we argue that a major source of the controversy stems from assumptions that countries have actually moved to a liberalized market environment we find that many of the most fundamental elements of the reform programs either remain unimplemented were reversed within several years or were implemented in such a way as to negate private sector investment incentives a framework is developed for explaining why some countries have been able to liberalize their food and fertilizer markets while others have not these findings have implications for how donor assistance and policy oriented research can more constructively contribute to an improved policy environment

is there a homogeneous causality pattern between oil prices and currencies of oil importers and exporters although the link between oil prices and dollar exchange rates has been frequently analyzed a clear distinction between prices and nominal exchange rate dynamics and a clarification of the issue of causality has not been provided in addition previous studies have mostly neglected nonlinearities which for example may stem from exogenous oil price shocks using monthly data for various oil exporting and oil importing countries this study contributes to the clarification of those issues we discriminate between long run and time varying short run dynamics using a markov switching vector error correction model in terms of causality the results differ between the economies under observation but suggest that the most important causality runs from exchange rates to oil prices with a depreciation of the dollar triggering an increase in oil prices on the other hand changes in nominal oil prices are responsible for ambiguous real exchange rate effects mostly through the price differential and partly also through a direct influence on the nominal exchange rate overall the fact that the adjustment pattern frequently differs between regimes underlines the fact that the relationships are subject to changes over time suggesting that nonlinearities are an important issue when analyzing oil prices and exchange rates

imperfect competition in agricultural markets evidence from ethiopia abstract drawing upon unique transaction level data from rural ethiopia this paper tests for general forms of imperfect competition among rural wholesale traders these are key to the grain distribution system as they purchase from farmers and perform interregional trade tests show that traders in a typical source market engage in imperfectly competitive behavior in purchasing from farmers driving down the price paid to farmers approximately 3 in contrast there is no conclusive evidence of imperfect competition among traders in the larger more centrally located market studied thus efficiency losses due to market structure are likely to be greatest in markets which also have poor road links and lesser volumes of marketed grain

trade and structural change nics and next tier nics as transitional economies abstract the paper finds a strong association between rapid change in the sectoral composition of output and exports structural change and rapid export growth in the newly industrializing countries capital formation appears to be encouraged in dynamic economies by the underpricing of investment goods vis a vis consumption and government goods within these economies also the underpricing of investment goods in dynamic economies is relatively greater than in less dynamic economies whereas other research has found low price distortion to be associated with high growth and an outward rather than an inward looking orientation these associations are seriously challenged and more caution is urged in reaching generalized conclusions

economic impacts of higher oil and gas prices the role of international trade for germany the analysis concentrates on direct and indirect price increases induced shifts in international trade and structural changes in the oil importing economies the paper at hand asks whether a stabilizing effect via international trade and domestic structural change on the gdp of oil importing countries can be observed if a permanent oil price increase occurs at least for germany structural change from consumer goods to investment goods industry and an improvement of international competitiveness limit negative impacts of increased energy prices analysis is based on the extensive and disaggregated global ginfors model and the detailed inforge model for the german economy

cereals market liberalization in mali abstract this paper analyzes the impact of the process of liberalization of cereal markets in mali most consumers including food deficient farmers and private grain traders have benefited from the liberalization efforts to tie the liberalization to a minimum support price for farmers failed because the state lacked the resources to guarantee the support price furthermore the ability of different types of farmers and traders to respond to opportunities created by the liberalization has varied widely depending on their access to productive resources improved technologies information and credit economy wide constraints such as the insecurity of contracts and liquidity constraints resulting from the failure of the government to pay salaries on time have further limited the impact of the liberalization

evaluating the effectiveness of inter regional trade and storage in malawi s private sector maize markets abstract this paper evaluates the effectiveness of the private sector maize marketing system in malawi using threshold autoregression models two dimensions of maize market performance are evaluated 1 inter regional trade and spatial price transmission and 2 storage and seasonal price relationships in both cases threshold autoregression models which account for nonlinearities predicted by economic theory are applied results indicate that spatial price transmission and seasonal price patterns in private sector maize markets in malawi are generally consistent with long run competitive inter regional trade and storage behavior and that in most cases shocks to long run equilibrium are arbitraged away quickly this suggests the private sector in malawi is generally doing a good job of transporting maize from surplus to deficit regions and smoothing maize consumption between harvests

exploitative briefcase businessmen parasites and other myths and legends assembly traders and the performance of maize markets in eastern and southern africa summary small scale assemblers are both the most vilified and least understood actors in food value chains in sub saharan africa drawing on data from kenya zambia malawi and mozambique this article explores how maize assemblers influence the market access conditions of small scale farmers assembly markets for maize are found to be highly competitive in terms of the number of traders operating and marketing margins farmers market access conditions in remote areas are particularly improved by the operation of assembly traders direct state operations in markets have sometimes unintentionally exacerbated market access conditions for farmers through their effects on rural assembly markets while smallholder farmers face important marketing challenges the brightest prospects for effectively addressing them require greater support for the development of competitive assembly markets rather than supplanting them

prediction tests for structural stability of multiple time series comparing forecasts with actually observed values is one possible way to check the structural stability of time series in this study prediction tests based on this principle are investigated in the context of multiple time series analysis it is found that the power of tests based on univariate series may exceed that of tests based on multivariate series and vice versa therefore it is proposed to use both kinds of tests in practice the tests are used to investigate the stability of a system of west german economic data during and after the 1973 1974 and 1979 1980 oil price increases

increasing returns and market efficiency in agricultural trade abstract using detailed trader surveys in benin madagascar and malawi this paper investigates the presence of increasing returns in agricultural trade after analyzing margins costs and value added we find little evidence of returns to scale motorized transport is found more cost effective for large loads on longer distances but transporters appear to pool quantities from multiple traders margin rates show little relationship with transaction size personal travel costs are a source of increasing returns but the effect is small consequently total marketing costs are nearly proportional to transaction size working and network capital are key determinants of value added constant returns to scale in all accumulable factors working capital labor and network capital cannot be rejected this implies that policies to restrict entry into agricultural trade are neither necessary nor useful governments should focus instead on technological and institutional innovations to upgrade agricultural markets

oil currencies in the face of oil shocks what can be learned from time varying specifications abstractwhile the oil currency property is clearly established from a theoretical viewpoint its existence is less clear cut in the empirical literature we investigate the reasons for this apparent puzzle by studying the time varying nature of the relationship between real effective exchange rates of five oil exporters and the real price of oil in the aftermath of the oil price shocks of the last two decades accordingly we rely on a time varying parameter var specification which allows the responses of real exchange rates to different oil price shocks to evolve over time we find that the reason of the mixed results obtained in the empirical literature is that oil currencies follow different hybrid models in the sense that oil countries real exchange rates may be driven by one or several sources of oil price shocks that furthermore can vary over time in addition to structural changes affecting oil countries structural changes arising from the oil market itself through the various time varying sour

oil shocks and aggregate macroeconomic behavior the role of monetary policy a recent paper by bernanke gertler and watson 1997 suggests that monetary policy could be used to eliminate any recessionary consequences of an oil price shock this paper challenges this conclusion on two grounds first we question whether the federal reserve actually has the power to implement such a policy for example we consider it unlikely that additional money creation would have succeeded in reducing the fed funds rate by 900 basis points relative to the values seen in 1974 second we point out that the size of the effect that bernanke gertler and watson attribute to oil shocks is substantially smaller than that reported by other researchers primarily due to their choice of a shorter lag length than that used by other researchers we offer evidence in favor of the longer lag length employed by previous research and show that under this specification even the aggressive federal reserve policies proposed would not have succeeded in averting a downturn