the heterogeneous dependence between global crude oil and chinese commodity futures markets evidence from quantile regression this paper explores the dependence between global crude oil and chinese commodity futures markets across different quantiles of the return distributions based on weekly data from 11 june 2004 to 7

intrinsic bubbles the case of stock prices several puzzling aspects of the behavior of united states stock prices may be explained by the presence of a specific type of rational bubble that depends exclusively on aggregate dividends the authors call bubbles of this type intrinsic bubbles because they derive all of their variability from exogenous economic fundamentals and none from extraneous factors intrinsic bubbles provide a more plausible empirical account of deviations from present value pricing than do the traditional examples of rational bubbles their explanatory potential comes partly from their ability to generate persistent deviations that appear to be relatively stable over long periods copyright 1991 by american economic association

quantifying the risk to crude oil imports in china an improved portfolio approach abstract china s rapid economic development caused a sharp increase in crude oil demand in 2011 china imported 254 million tons of crude oil in total with its dependence on imported oil reaching 56 5 this paper carries out a quantitative study on the risk of china s crude oil imports by establishing an assessment model which has two primary characteristics first the model not only uses portfolio theory to assess the risk to china s crude oil imports taking into consideration the effect of the diversified sources of imports but also introduces a correlation coefficient which considers the risks associated with importing oil from oversea sources second the correlation between import prices and global oil prices is analyzed with respect to each exporting country the ease of doing business index grading system is introduced in order to represent the risk weight for each exporting country because of these improvements the model provides operable methods for studying how global oil prices import volumes the diversification index and the political and economic situation of the exporting countries affects china s crude oil import risks as well as offers a method for implementing optimal crude oil import strategies it is concluded that china s crude oil import risks associated with the middle east are not as precarious as researchers traditionally reported among countries in the middle east there exist obvious disparities and differences affecting the kinds and types of risks involved therefore these risks should be treated piecemeal when performing an overall assessment of crude oil import risks in china it should also be noted that with respect to the middle east there is still room for china to optimize the mix of source countries in order to reduce risks china should raise the volume of imports coming from low risk countries as well as add new low risk exporting countries to its importing portfolio

oil prices and mena stock markets new evidence from nonlinear and asymmetric causalities during and after the crisis period this article investigates the potential of nonlinear causal relationships between world oil prices and stock markets in middle east and north africa mena countries during a black swan period that is characterized by rarity and devastating impacts our study is carried out using the daily data for 11 mena countries over the period from 2 july 2007 to 27 august 2012 by using the nonlinear and asymmetric causality test of kyrtsou and labys 2006 we mainly find that i the oil prices and mena stock markets interact in a nonlinear manner ii the signs of changes in the causing variables are important for detecting the true causality links between the variables and iii the nonlinear causality is more pronounced in the case of the brent than west texas intermediate oil prices

quantifying china s oil import risks and the impact on the national economy abstract with an increase in china s oil imports china s oil supply will also continue to be effected by the socio economic stability of oil exporting countries and the safety of oil transport routes this paper introduces a systematic and quantitative method to evaluate the influence of china s oil import risks oir on the national economy and industrial sectors from a perspective of apply chain process for this analysis china s oir is quantified by integrating oil exporting country risk and the risks from oil transportation routes country risk is defined as the oil exporting country s political risk caused by political changes or internal conflicts transport risk is defined as the risk of shipping routes affected by pirate attacks and geopolitics second the relationship between china s oir and oil import costs is analyzed using a multiple linear approach third an input output analysis method is used to research the effect of the cost of china s oil imports on the cost of investment within china s domestic sectors this research finds that the corresponding impact on gdp is 3494 5 million dollars given an increasing by 10 of china s oir and the impact on domestic sectors differs from sector to sector finally this paper puts forth recommendations to improve long term oil supply security in china

evaluating energy security in the asia pacific towards a more comprehensive approach the energy security conundrum how to equitably provide available affordable reliable efficient and environmentally benign energy services is a technology and policy challenge perhaps unlike any other the recent article on an energy security in the asia pacific by vlado vivoda is an excellent starting point for how to best capture the unique energy security challenges facing the region this article builds on vivoda s work but also points out some shortcomings with his analysis

identification of house price bubbles using user cost in a state space model this article studies how much variation in house prices results from nonfundamental factors we propose a relative valuation approach to quantifying a bubble in housing by incorporating the housing user cost into a state space model we find that uk house prices were undervalued from january 1995 to may 2001 and subsequently moved into a bubble over the period to october 2012 our results support the bounded rationality hypothesis in the long run however we also find that the irrational and the rational expectation hypotheses can coexist in the short run when explosive bubbles are driven by price dynamics

quantifying the supplier portfolio diversity of embodied energy strategic implications for strengthening energy resilience this paper investigates energy resilience of countries by quantifying the supplier diversification of both direct and embodied energy import in particular we quantify two approaches to diversify a country s supplier portfolio by lowering the dependency on each supplier portfolio diversification and by having embodied energy suppliers that are different from its direct energy suppliers portfolio differentiation we examine possibilities for strategic utilization of embodied energy trade to compensate for low diversity of direct energy trade for three types of fossil resources coal oil and gas we find that the diversity of embodied energy import is much greater than that of direct energy import of the three energy resources coal enables countries to adopt portfolio diversification and portfolio differentiation more than gas and oil our results suggest embodied energy can be considered as a transfer of energy resources across national borders that can directly benefit from the diversity of the world energy production by skipping the limited diversity of the world energy export

evaluating china s natural gas supply security based on ecological network analysis abstract growing role of natural gas as an effective policy choice has kindled the discussions surrounding the security of its supplies in the policy circles of the chinese government this study tries to evaluate china s natural gas supply security and employs a system oriented modelling approach namely ecological network analysis ena to integrate all the critical compartments of china s natural gas supply system several ena indicators are constructed which disclose that domestic natural gas production contributes significantly to china s natural gas supply system in comparison with all the external natural gas suppliers in addition the variations in a system stability indicator suggest that diversification of external natural gas suppliers has a positive influence on china s natural gas supply security furthermore the results revealed that china s natural gas supply security policy is orchestrated on following features 1 to increase the investment in the upstream natural gas production sector to boost its domestic production in order to reduce its import requirements and 2 to diversify the external natural gas supplies by sources and routes to reduce the level of the economic and supply disruption related risks

comparison of china s oil import risk results based on portfolio theory and a diversification index approach in recent years the international oil price has fluctuated violently bringing about huge risk for the international oil trade in fact the risk of crude oil and petroleum product imports is different because of the different import origins and prices which import risk is lower for china from the perspective of oil supply security how should china portfolio crude oil and petroleum product imports to minimize its oil import risk using portfolio theory and a diversification index approach this paper compares and analyzes the supply price and transport risks of crude oil and petroleum product imports our results show that the following 1 specific risk diversification risk and marine transport risk of china s petroleum product imports are lower than that of crude oil imports 2 the average rate of return of china s petroleum product imports is higher than that of crude oil imports moreover the average import price variance of petroleum product imports is lower than that of crude oil imports thus the systematic risk price risk of petroleum products is lower too therefore from the perspective of oil supply security china should increase petroleum product imports to decrease its oil import risk

tax subsidies to owner occupied housing an asset market approach inflation reduces the effective cost of homeownership and raises the tax subsidy to owner occupation this paper presents an asset market model of the housing market and estimates how changes in the expected inflation rate affect the real price of houses and the equilibrium size of the housing capital stock simulation results suggest that the accelerating inflation of the 1970s which substantially reduced homeowners user costs could have accounted for as much as a 30 percent increase in real house prices persistent high inflation rates could lead ultimately to a sizable increase in the stock of owner occupied housing

diversity and security in uk electricity generation the influence of low carbon objectives abstract we explore the relationship between low carbon objectives and the strategic security of electricity in the context of the uk electricity system we consider diversity of fuel source mix to represent one dimension of security robustness against interruptions of any one source and apply two different diversity indices to the range of electricity system scenarios produced by the uk government and independent researchers our results show that low carbon objectives are uniformly associated with greater long term diversity in uk electricity generation with reference to data on wind generation we also consider the impact of source variability on a second dimension of security the reliability of generation availability we conclude that this does not undermine our fundamental conclusion that low carbon scenarios are associated with greater strategic security of supply in uk electricity we discuss reasons for this result explore sensitivities and briefly discuss possible policy instruments associated with diversity and their limitations

does china factor matter an econometric analysis of international crude oil prices abstract whether china s crude oil imports are the culprit of oil price volatility these years has not been quantitatively confirmed therefore this paper empirically investigates the role of china s crude oil net imports in brent price changes from october 2005 to november 2013 based on an econometric analysis the results indicate that during the sample period china s crude oil imports do not significantly affect brent price changes no matter in the long run or short run therefore the blame for china s crude oil imports to cause the dramatic fluctuations of international oil price has no solid evidence also there exists significant uni directional causality running from the brent price to china s crude oil imports at the 5 level besides the response of the brent price to china s crude oil imports is found positive but slight and the brent price responds more significantly to us dollar exchange rate and oecd commercial inventory than to china s crude oil imports in the short run finally the contribution of china s crude oil imports to brent price movement is about 10 which is less than that of us dollar exchange rate but larger than that of indian crude oil imports or oecd commercial inventory

price and resource related uncertainty in the estimation of the revenue of a wind farm the revenue that wind farms produce is subject to the inherent uncertainty of the wind resource in the short run and the long term this revenue is subject to an additional price related uncertainty in jurisdictions where the output of the wind farms is paid at the prices cleared at the local electricity market an econometric model is developed to estimate the risks of using limited information in the estimation of the annual revenue of a wind farm sensitivities that measure the influence of each uncertainty factor in the overall risks are also developed an application example is shown by which investors or policy makers may determine how typical wind farm capital costs may influence financial project feasibility under a predetermined risk

transmission management for congested power system a review of concepts technical challenges and development of a new methodology transmission networks have some constraints that should be addressed in order to ensure sufficient control to maintain the security level of a power system while maximising market efficiency the most obvious drawback of transmission constraints is a congestion problem that becomes an obstacle to perfect competition among the market participants since it can influence spot market pricing as the power flow violates transmission constraints redispatching generating units is required and this will cause the price at every node to vary this manuscript presents concepts technical challenges and methodology for investigating an alternative solution to the redispatch mechanism and then formulates lmp scheme using an optimisation technique that may well control congestion as the main issue the lmp scheme are varied and improved to take into account the energy price congestion revenue cost of losses as well as the transmission usage tariff by utilising shift factor based optimal power flow sf opf which is derived from the well known dc optimal power flow dc opf model

an empirical analysis of the risk of crude oil imports in china using improved portfolio approach abstract this paper quantifies the diversification index of china s crude oil imports during the period 1996 2004 and explores the relationship between the monthly prices and brent crude oil cash prices accordingly we calculate the systematic and specific risks using portfolio theory of china s crude oil import over the period 1996 2004 because china s crude oil import increased rapidly since 1996 we improve upon the traditional portfolio theory and develop a risk index model of portfolio theory for crude oil imports in order to explore objectively the changes in china s crude oil import risks the results show that china s crude oil import risk is affected extensively by the fluctuation of international oil prices so the traditional portfolio theory is insufficient to measure china s crude oil import risk the improved portfolio theory risks index model reflects the effect of international oil prices diversification imports and geopolitics factors etc on crude oil import risk and changes in crude oil import risk therefore the risk index model of portfolio theory provides greater theoretical and methodological robustness as an indicator of china s crude oil import security than that offered from the application of traditional measures of dependence

balancing energy security priorities portfolio optimization approach to oil imports the notion of energy security in most interpretations includes the physical supply and price affordability components making financial risks a crucial part of energy security strategies mainstrea

evaluating the dynamic performance of energy portfolios empirical evidence from the dea directional distance function abstract in recent years the complex global energy commodity market has led to increased uncertainty for energy investment returns and tremendous challenges for investors to design appropriate energy portfolios therefore we employ four popular portfolio methods to determine energy portfolios based on daily fossil fuel futures prices during 2006 2015 moreover we use the dea window analysis method and dea directional distance function to comprehensively evaluate the dynamic performance of these energy portfolios based on the efficiency perspective the empirical results indicate that first to increase investment returns the mean variance method that exclusively emphasizes the maximization of returns shows the best performance however in order to decrease the volatility and risk of investment returns the mean variance method that aims to resist risk more than make profits and the bootstrap historical simulation value at risk var method have the best performance second when the global financial crisis broke out in the second half of 2008 and energy markets experienced a sharp downturn in the second half of 2014 the dea efficiency of energy portfolios appeared relatively lower than those of their neighboring periods regardless of which portfolio method is employed finally the average dea efficiencies of energy portfolios are all higher than those of single energy investment throughout the sample period except when the equally weighted method and the information entropy comprehensive index method are used meanwhile the mean variance method that prefers profit making to risk resisting possesses the highest average dea efficiency among various methods concerned

market volatility and investor behavior it appears that speculative asset prices tend to show excess volatility relative to simple present value efficient markets models and that prices are partly forecastable as tending to returning to mean appropriately defined but what does this tell us about how speculative prices are determined are there fads in prices and if so how do they behave the question has arisen recently whether there is really room for fads in speculative prices whether or not speculative prices are too volatile if stock prices are highly correlated with dividends we might conclude that the movements in stock prices are driven by fundamentals not fads a question of longer standing is whether fads models that entail feedback from price change to price change are consistent with the observed approximate random walk price behavior that is rather low serial correlation of short run price changes we can also ask whether the feedback models are consistent with the observed relation of stock prices to dividends and earnings

oil shocks and stock volatility new evidence via a bayesian graph based var approach abstractthis article examines the temporal dependence between three oil shocks and realized volatility in the stock markets of g20 countries between 1994 and 2019 by applying a novel graphical b

energy risk management and value at risk modeling abstract the value of energy trades can change over time with market conditions and underlying price variables the rise of competition and deregulation in energy markets has led to relatively free energy markets that are characterized by high price shifts within oil markets the volatile oil price environment after opec agreements in the 1970s requires a risk quantification value at risk has become an essential tool for this end when quantifying market risk there are various methods for calculating value at risk the methods we introduced in this paper are historical simulation arma forecasting and variance covariance based on garch modeling approaches the results show that among various approaches the hsaf methodology presents more efficient results so that if the level of confidence is 99 the value at risk calculated through hsaf methodology is greater than actual price changes in almost 97 6 percent of the forecasting period

china s sovereign wealth fund investments in overseas energy the energy security perspective abstract sovereign wealth funds swfs are state owned investment funds that invest in real and financial assets since the global financial crisis in 2008 swfs investments have resulted in national security concerns of host countries because swfs continue to expand rapidly and have become increasingly active in real time strategic transactions given this background china which has the biggest swf in the world is facing severe challenges of energy resources shortages while its plan is to accomplish social and economic development goals energy security is a key driving force of the energy investment policy of china s swfs this makes the swf investments more complicated and more politically sensitive the combination of sovereign rights and the strategic importance of energy also makes geopolitics more complicated and brings more uncertainty to swf investments this article explores the relationship between energy security and energy investments of china s swfs it is recognised that the energy investment of swfs must follow a sustainable path to coordinate energy security economic growth return on investment and national security concerns government policymakers are urged to balance the financial and political returns on swfs against potential negative effects the conclusion presents insights for policymakers energy scholars and swf researchers

diversification of oil import sources and energy security a key strategy or an elusive objective this paper explores the relationship between the diversification of sources of imported oil and energy security of oil importing countries it examines the importance of diversification policy for oil importers explains why oil importers implement oil diversification policy and contextualizes the oil import diversification strategy in the overall energy security policy of oil importers the paper analyzes the factors and the contexts that affect the level of importance assigned to oil import diversification policy in oil importing countries and the limitations that may affect the successful implication of oil import diversification policy the examples are drawn from the world s top three oil importers the united states japan and china the policymakers in these and other oil importing countries place much importance on energy security the diversification of oil import sources is used as one of the strategies to enhance energy security in oil importing countries this paper is important for policymakers in oil importing countries as it provides them with a qualitative conceptual framework with which to evaluate the need to diversify their countries sources of imported oil and with which to identify the likely limitations to the successful implementation of oil import diversification policy

pitfalls in testing for explosive bubbles in asset prices a number of studies e g robert j shiller 1981 olivier j blanchard and mark watson 1982 kenneth d west 1988 have argued that dividend and stock price data are not consistent with the market fundamentals hypothesis in which prices are given by the present discounted values of expected dividends these results have often been construed as evidence for the existence of bubbles or fads related arguments have been made with respect to gold bonds and foreign exchange a major problem with such arguments e g james hamilton and charles whiteman 1985 is that apparent evidence for bubbles can be reinterpreted in terms of market fundamentals that are unobserved by the researcher behzad t diba and herschel i grossman 1984 1988b and hamilton and whiteman 1985 have recommended the alternative strategy of testing for rational bubbles by investigating the stationarity properties of asset prices and observable fundamentals 1 in essence the argument for equities is that if stock prices are not more explosive than dividends then it can be concluded that rational bubbles are not present since they would generate an explosive component to stock prices 2 using unit root tests autocorrelation patterns and cointegration tests to implement this procedure diba and grossman 1988b p 529 state that the analysis supports the conclusion that stock prices do not contain explosive rational bubbles this paper shows that the above battery of tests is in fact unable to detect an important class of rational bubbles the point is demonstrated by constructing rational bubbles that appear to be stationary when unitroot tests are applied even though they are explosive in the relevant sense simulations show that when such bubbles are present stock prices will not appear to be more explosive than dividends on the basis of these tests even though the bubbles are substantial in magnitude and volatility the presence of rational bubbles in actual stock prices thus remains an open question

an investigation into the dynamic relationship between international and china s crude oil prices abstractthis article studies the dynamic relationship between international wti brent and dubai and domestic da qing crude oil prices in china using threshold cointegration method we find evidence of a long run equilibrium relationship between each pair of international and da qing oil prices favouring the market integration hypothesis we also estimate asymmetric adjustments under the momentum threshold autoregressive m tar specification in a tvecm and the results show that adjustments to eliminate disequilibrium happen faster when oil price spread increases than when it decreases the long run and short run granger causality tests support the notion that china has influence on the international oil markets the results imply that china should open up its domestic and imported oil markets and also establish a well functioning crude oil futures market as they are essential for arbitrage and hedging strategies

electricity markets cleared by merit order part ii strategic offers and market power in an electricity market cleared by a merit order economic dispatch we make use of the mixed integer linear programming milp scheme derived in part i to find the market outcomes supported by a pure strategy nash equilibria ne from these ne we identify offer strategies in terms of gaming or not gaming that best meet the risk benefit expectations of the participating gencos to do this a number of measures of potential profit gain and loss are developed that quantify the notion of risk benefit under the possible multiple ne the ne identification scheme is tested on several systems of up to 30 generating units each with four incremental cost blocks also showing how market power is influenced by the number and size of the competing gencos as well as by the imposed price cap