Hedging and diversification across commodity assets

ABSTRACT

We investigate the conditional cross effects and volatility spillover between equity markets and commodity markets (oil and gold), Fama and French HML and SMB factors, volatility index (VIX) and bonds using different multivariate GARCH specifications considering the potential asymmetry and persistence behaviours. We analyse the dynamic conditional correlation between the US equity market and a set of commodity prices and risk factors to forecast the transmission of shock to the equity market firstly, and to determine and compare the optimal hedge ratios from the different models based on the hedging effectiveness of each model. Our findings suggest that all models confirm the significant returns and volatility spillovers. More importantly, we find that GO-GARCH is the best-fit model for modelling the joint dynamics of different financial variables. The results of the current study have implications for investors: (i) the equity market displays inverted dynamics with the volatility index suggesting strong evidence of diversification benefit; (ii) of the hedging assets gold appears the best hedge for the US equity market as it has a higher hedge effectiveness than oil and bonds over time; and (iii) despite these important results, a better hedge may be obtained by using well-selected firm sized and profitability-based portfolios.     

Firm productivity and agglomeration economies: evidence from Egyptian data

This paper attempts to shed the light on the nexus between firms’ productivity and economies of agglomeration in Egypt. Using a large dataset of firms in 342 firms’ four-digit activities in 27 regions (62,108 firms), we introduce three measures of agglomeration which are urbanization or firm diversification measured by the number of firms by governorate, localization and specialization measured by the average productivity by governorate and sector (generating externalities and knowledge spillovers) and finally competition measured by the number of firm operating in the same governorate and the same sector. We find strong evidence for the existence of agglomeration in Egypt after controlling for firm age, location, economic activity and legal status. In the Egyptian context, productivity spillovers gained from agglomeration measures outweighed the negative effects of competition implied by congestion. The latter is chiefly due to the lack of good infrastructure. When regressions are run by firm size, location and activity, our main findings show first that micro and small firms are more likely to benefit from localization and diversification compared to medium and large firms. Service firms benefit more from high level of diversification while manufacturing firms gain more benefits from knowledge spillovers and specialization in Egypt.     

What does export diversification do for growth? An econometric analysis

It is frequently suggested that export diversification contributes to an acceleration of growth in developing countries. Horizontal export diversification into completely new export sectors may generate positive externalities on the rest of the economy as export oriented sectors gain from dynamic learning activities due to contacts with foreign purchasers and exposure to international competition. Vertical diversification out of primary into manufactured exports is also associated with growth since primary export sectors generally do not exhibit strong spillovers. Yet there have been remarkably few empirical investigations into the link between export diversification and growth. This paper attempts to examine the hypothesis that export diversification is linked to economic growth via externalities of learning-by-doing and learning-by-exporting fostered by competition in world markets. The diversification-led growth hypothesis is tested by estimating an augmented Cobb–Douglas production function on the basis of annual time series data from Chile. Based on the theory of cointegration three types of statistical methodologies are used: the Johansen trace test, a multivariate error-correction model and the dynamic OLS procedure. Given structural changes in the Chilean economy, time series techniques considering structural breaks are applied. The estimation results suggest that export diversification plays an important role in economic growth.     

External economies as a mechanism of agglomeration in EU manufacturing

Productive externalities are significant determinants of agglomeration, not deeply studied at the industry and international level. We analyse the impact on productivity growth of technological externalities, both inter- and intraindustry, national or international, at the industry level for the EU countries and the period 1995–2002. The results confirm the advisability of considering international externalities when countries are taken as regions, whose omission underestimates national spillovers. Together with national endowments and a central geographical position, the growth of productivity is encouraged by national and international specialization as a general result; moreover, it is fuelled by stronger interindustry spillovers and productive diversification, a result more evident for high technology industries, while lower technology industries are more sensitive to the omission of international externalities. Economic integration seems to be relevant, because supranational regions with less friction for goods and factor movements are more likely to take advantage of external economies as a mechanism of productivity growth and agglomeration.     

Quantile spillovers and dependence between Bitcoin,equities and strategic commodities

This paper has two aims. We first examine the dynamic spillovers between Bitcoin and 12 developed equities, gold, and crude oil for different market conditions using a Bayesian Time-Varying Parameter Vector Autoregressive (TVP-VAR) model with daily spot prices. Our econometric approach enables us to capture the left and right tails as well as the shoulders of the return distribution corresponding to volatility spillovers under the bear, normal, and bull market states among these financial assets. We quantify and trace the dependence and directional predictability from Bitcoin to other assets using the sample cross-quantilogram. Our key findings offer convincing evidence of time variation in the level of volatility. Spillovers between Bitcoin and other financial assets intensify during extreme global market conditions. Secondly, results from the cross-quantilogram indicate strong dependence and positive directional predictability between Bitcoin and most equities and crude oil when market returns are bullish. However, during the bearish market period, there is negative dependence and predictability from Bitcoin to stocks in Finland, the Netherlands, the U.S.A, and the crude oil market only. This implies that Bitcoin can act as a hedge to stocks in Finland, the Netherlands, the U.S.A, and the crude oil market. However, insignificant dependence and directional predictability from Bitcoin to the remaining assets indicate that Bitcoin may act as a safe-haven to these assets during bearish markets. Our findings hold important implications for both international investors and portfolio managers who consider Bitcoin as part of their portfolio diversification and other investment strategies.     

Analysing dynamic linkages and hedging strategies between Islamic and conventional sector equity indexes

This study analyses the dynamic spillovers across 10 Dow Jones Islamic and conventional sector index pairs. Using various multivariate GARCH models, the results show significant time-varying conditional correlations for all the pairs. Moreover, there is evidence that the conditional correlations for all the sector pairs, except those of the Telecommunication and Utilities sectors, increase after the onset of the global financial crisis (GFC), suggesting non-subsiding risks, contagion effects and gradual greater financial linkages. The Islamic sectors’ risk exposure can be effectively hedged over time in diversified portfolios containing conventional sector stocks. These results provide several practical implications for portfolio managers and policymakers in regard to optimal asset allocations, portfolio risk management and the diversification benefits among these markets.     

期货市场与现货市场之间的价格研究--中国农产品市场的经验

本文借助于信息共享模型与波动溢出效应模型对我国大豆和小麦的期、现货市场之间的价格发现进行了多层次的实证研究,定量描述了期、现货市场在价格发现中作用的大小,深入刻画了我国农产品期、现货市场之间的动态关系.研究结果显示:大豆期、现货价格之间存在双向引导关系,小麦仅存在期货对现货的单向引导关系;期、现货市场均扮演着重要的价格发现角色,且期货市场在价格发现中处于主导地位;期、现货市场之间均存在双向波动溢出关系,但现货市场来自期货市场的波动溢出效应均强于期货市场来自现货市场的波动溢出效应;并且,随着期货市场的发展,期、现货市场之间的波动溢出程度均呈逐渐增强态势.     

Multinationals, Endogenous Growth, and Technological Spillovers: Theory and Evidence*

FDI has received surprisingly little attention in theoretical and empirical work on openness and growth. This paper presents a theoretical growth model where MNCs directly affect the endogenous growth rate via technological spillovers. This is novel since other endogenous growth models with MNCs, e.g. the Grossman–Helpman model, assume away the knowledge‐spillovers aspect of FDI. We also present econometric evidence (using industry‐level data from seven OECD nations) that broadly supports the model. Specifically, we find industry‐level scale effects and international knowledge spillovers that are unrelated to FDI, but we also find that bilateral spillovers are boosted by bilateral FDI.     

The effectiveness of international knowledge spillover channels

Using panel data from 16 Organization for Economic Cooperation and Development (OECD) countries for the period 1981–2000, we examine the significance of international knowledge spillovers through inward and outward foreign direct investment (FDI), intermediate goods imports, and a disembodied direct channel. Knowledge spillovers through the disembodied direct channel are approximated by using a measure of technological proximity and patent citations between countries. Using estimation models that reflect recent developments in non-stationary panel data econometrics, we show that international knowledge spillovers through inward FDI and the disembodied direct channel are significant and robust. In contrast, outward FDI and imports of intermediate goods are not conducive to international knowledge spillovers.     

集聚经济、相关性多样化与城市经济增长--基于279个地级及以上城市面板数据的实证分析

文章基于演化经济地理学理论,运用熵指数探讨了城市产业多样化和专业化对城市经济的影响,并根据2003－2010年中国279个地级及以上城市的产业统计数据实证研究了集聚经济、城市产业相关性多样化和无关性多样化对城市经济增长的影响。研究结果表明：（1）整体而言,城市产业集聚的多样化和专业化都能促进城市经济增长,但是多样化的作用显著大于专业化的作用;（2）并非所有的多样化都能显著促进地区经济增长,以知识溢出为主要影响机制的相关性多样化能显著促进经济增长,而以组合效应为主的无关性多样化不能或尚未促进经济增长。这表明我国城市经济发展受益于具有相关性或互补性的多样化部门和专业化部门所带来的知识溢出。文章验证了我国城市经济中既相关联又具差异化的知识溢出对城市经济增长的重要作用。     

Does distance matter in spillover?1

Our aim in this paper is twofold: to find whether FDI causes horizontal or vertical productivity spillovers to domestically‐owned Hungarian manufacturing firms, and to see if distance matters in spillovers. For this exercise we use a large panel of Hungarian firms and different panel models. Consistently with previous research, at the country level, we find positive vertical spillovers but no evidence of positive horizontal spillovers. By taking distance into consideration, however, we find positive horizontal spillovers for domestic firms close to foreign‐owned firms. By constructing spillover measures weighted by distance, we find similar patterns. Our results underline the importance of labour market rigidity and the local nature of knowledge in the case of horizontal spillovers.     

DYNAMIC ENTRY WITH DEMAND AND SUPPLY SIDE SPILLOVERS

Supply side spillovers have been used to explain firms' entry behavior in the pharmaceutical industry. In contrast, demand side spillovers have received less attention. This paper identifies supply and demand spillovers using a dynamic model of strategic interaction. The results indicate that demand side spillovers are more significant than the supply side spillovers to generic drug firms, and the demand side spillovers increase a firm's market share by 3%–4% on average in subsequent market entry. In addition, with supply side spillovers alone, lowering entry barriers can increase future entry rates, while in the case of demand side spillovers, lowering entry barriers will have the opposite effect. (JEL L110, L130, D220)     

Human capital and international knowledge spillovers in TFP growth of a sample of developing countries: an exploration of alternative approaches

This study tests and compares the two major approaches to the modelling of human capital in growth regressions, i.e. the Lucas and the Nelson-Phelps approach, in the context of developing country models with international knowledge spillovers. On balance, the results seem to favour the Nelson-Phelps approach. Using human capital stock variables instead of flow variables, a positive role for human capital in the absorption of international knowledge spillovers other than embodied R&D spillovers is confirmed. The results suggest the importance of distinguishing between different types of international knowledge spillovers, as well as between different human capital sub-categories.     

The existence of R&D spillovers: A cost function estimation with random coefficients

This is a study of the effects of R&D spillovers on the cost and production structures of Finnish manufacturing firms. Confidential data on firms is used to estimate a translog cost function system with random coefficients. Although the results suggest that intra-industry spillovers are present in Finnish manufacturing, the findings regarding inter-industry spillovers are inconclusive. The variable cost reduction associated with spillovers is positive, but relatively low. Spillovers reduce the demand for labor but increase the demand for materials. Spillovers also reduce the willingness to pay for capital inputs.     

The Bioeconomics of Marine Reserves: A Selected Review with Policy Implications

The paper ‘bridges the divide’ between the biological and economic literature on marine reserves. It provides a selected review of the traditional use of reserves, the early reserve literature, the potential benefits of reserves, spillovers from reserves to harvested areas and bioeconomic models of marine reserves. The bioeconomics literature is examined from the perspectives of deterministic models, spatial economic models and models that include uncertainty and stochasticity. Insights from the review are used to provide management implications in terms of reserve design, stakeholder cooperation and process, reserve-fishery transfers, traditional management controls, and ecosystem approaches to managing fisheries.     

Precious metals,oil and the exchange rate: contemporaneous spillovers

We investigate the contemporaneous spillovers among precious metals, crude oil and the US$ exchange rate. We contend that conventional reduced-form vector autoregressive (VAR) models based on lead/lag relations do not fully capture the interactions among these series as these models ignore the contemporaneous effects. Using a Structural VAR model, we identify these contemporaneous spillovers, which are shown to be strong and asymmetric. We further show that not taking into consideration the contemporaneous interactions among these assets leads to inaccurate findings and inevitably to inaccurate interpretations of the causal relations among them.     

Safe haven,hedge and diversification for G7 stock markets: Gold versus bitcoin

We compare gold and Bitcoin for the G7 stock markets, finding that gold and Bitcoin have distinct safe haven and hedging characteristics. Gold is an undisputable safe haven and hedge for several G7 stock indices, whereas Bitcoin takes these two functions in Canada. The out-of-sample hedging effectiveness of gold is much superior to that of Bitcoin. Furthermore, we find that the conditional diversification benefits offered by gold to equity investments in the G7 markets are comparatively much higher and more stable than those of Bitcoin, especially in the lower return quantiles, i.e., when both the stock and gold markets are in a bearish state. Implications are further discussed.     

Macroeconomic spillover effects of the Chinese economy

The slowdown of economy and widening of domestic imbalances in China bothers economists and politicians across the globe. We estimate the influence of a negative output shock in China on a number of different economies. We concentrate on China's neighboring countries. We compare the results from the Global VAR model and from the Bayesian VAR models. Also using Bayesian model averaging we search for determinants of Chinese spillovers for the global economy. We find that spillovers are stronger to economies with less flexible exchange rates, a higher share of manufacturing in gross value added and to economies which are larger.     

Entry Solicitation and Deterrence in R&D Competition with Spillovers

The purpose of this note is to examine incumbent behaviour and patterns of entry under R&D competition with spillovers. We find that, in addition to blockading, deterring and accommodating entry, the incumbent may also solicit entry. Entry solicitation occurs when the incumbent strategically alters its R&D commitment in order to take advantage of the spillover generated by the entrant's subsequent R&D investment. Although our results are placed in the context of R&D with spillovers, they are applicable to a wider class of models involving positive externalities, particularly network externalities.
JEL Classification Numbers: L12, O31.     

A model of the learning process with local knowledge externalities illustrated with an integrated graphical framework

We present a unified graphical framework accounting for the nature and impact of spillover effects. The dynamics of the learning process with a specific spillover transfer mechanism can be illustrated by referring to this four-quadrant picture. In particular, a whole cycle of technological learning is explained with the help of such a graphical representation of the basic learning process in the presence of knowledge spillovers.

We hypothesize two different functional specifications of spillover exchanges among firms within a local innovation system. Each conceivable shape for the knowledge transfer relationship among firms expresses a possible mode and intensity of information processing arising from technology spillovers. A general proposition regarding the relative efficiency of the two alternative formal models with spillover effects is derived. The basic models with spillover effects are then extended in several relevant directions.