Volume,volatility and information linkages in the stock and option markets

This paper examines the relationship between option trading activity and stock market volatility. Although the option market is uniquely suited for trading on volatility information, there is little analysis on how trading activity in this market is linked to stock price volatility. The bulk of the discussion tends to focus on whether trading activity in the stock market is informative about stock volatility. To analyze the information in option trading activity for stock market volatility, a sample of 15 stocks with the highest option trading volume is selected. For each stock, it is noted that the trading activities in the put and call option markets have significant explanatory power for stock market volatility. In addition, the results indicate that the call option trading activity has a stronger impact on stock volatility compared with that of the put options. Our results demonstrate that information and sentiment in the option market is useful for the estimation of stock market volatility. Also, the significance of the effects of option trading activity on stock price volatility is observed to be comparable to that of stock market trading activity. Furthermore, the persistence and asymmetric effects in the volatility of some stocks tend to disappear once option trading activity is taken into account.     

Trend in aggregate idiosyncratic volatility

We suggest that price interaction among stocks is an important determinant of idiosyncratic volatility. We demonstrate that as more (less) stocks are listed in the markets, price interaction among stocks increases (decreases), and hence stocks, on average, become more (less) volatile. Our results show that price interaction has a significant positive effect of idiosyncratic volatility. The results of various robustness checks indicate that the effect of price interaction is still significant to the presence of liquidity, newly listed firms, cash flow variables, business cycle variables, and market volatility. Once the price interaction effect is taken into account, no trend remains in idiosyncratic volatility. We conclude that there is no trend, but a reflection of the positive effect of price interaction on idiosyncratic volatility.     

Trading imbalances,predictable reversals,and cross-stock price pressure

We test the implications of a multi-asset equilibrium model in which a finite number of risk-averse liquidity providers accommodate non-informational trading imbalances. These imbalances generate predictable reversals in stock returns. An imbalance in one stock also affects the prices of other stocks. The magnitude of the cross-stock price pressure depends on the correlations of the stocks’ underlying cash flows. The model implies that non-informational trading increases the volatility of stock returns. We confirm the model's implications using data from the Taiwan Stock Exchange.     

Dynamics of smallholder participation in horticultural export chains: evidence from Ecuador

We study the dynamics of smallholder participation in export value chains focusing on the example of small‐scale broccoli producers in the highlands of Ecuador. Combining cross‐sectional data from a household survey with 11‐year longitudinal data on export market transactions, we explain the hazards of dropping out of a high‐value export chain. We apply a multispell cox duration model that allows us to consider multiple entries and exits from the supply chain. We also provide evidence on the welfare impacts associated with participation. The results suggest that small‐scale farmers’ exit from the export sector is accelerated by high transaction risks experienced in the past. While we find no particular evidence for the exclusion of small‐scale farmers from the export sector, we do find that poorer households and female‐headed households tend to drop out faster, especially as long as the sector is still prospering. Finally, when considering welfare effects, we do not find evidence that participation translates into tangible benefits for broccoli farmers. We discuss some measures that could help improve the long‐term sustainability of smallholder integration in high‐value chains.     

Roundup Ready soybeans in Argentina: farm level and aggregate welfare effects

Although adoption rates of genetically modified crops have been staggering in some countries, there is still comparatively little evidence about biotechnology impacts under diverse agroecological and institutional conditions. These knowledge gaps lead to an overly precautious attitude among policy makers and the public. This article analyzes the effects of Roundup Ready (RR) soybeans in Argentina, the country with the second biggest transgenic area worldwide. Based on recent survey data, it is shown that the technology increases total factor productivity by 10% on average, with cost savings being somewhat more pronounced for smaller than for larger farms. The reduction in use of toxic herbicides and of tillage operations entails positive environmental repercussions. Aggregate welfare effects are computed over the 1996–2001 period with a three-region, partial equilibrium model, comprising Argentina, the United States, and the rest of the world. In 2001, RR soybeans created more than US$1.2 billion of economic surplus at the global level. The largest share went to consumers (53%), followed by seed and biotechnology firms (34%), and agricultural producers (13%). Due to comparatively weak intellectual property protection, and thus only small technology mark-ups in seed prices and widespread adoption, Argentine soybean growers receive 90% of the benefits in that country. This demonstrates that farmers in developing countries can gain considerably when they obtain access to suitable foreign innovations through technology spill-overs.     

Trade,Geography, and Industry Growth in U.S. Manufacturing

Much of the recent empirical literature examining the New Economic Geography has focused on how access to markets impacts wages. In this article, we consider an alternative aspect of the theory by examining how access to markets affects industry growth. We develop a model relating the growth of two key measures of market size—market access and supplier access—to growth in industry employment and the real value of industry shipments. We estimate the model using data on U.S. manufacturing industries between 1984 and 1996. We find strong evidence to suggest that access to markets positively affects industry growth.     

REGIONAL VARIATION IN LIVELIHOOD STRATEGIES IN MALAWI

We identified livelihood strategies at the household level as a function of assets held using survey data from Malawi. We only included endowments that we expected to be predetermined. As expected, land, household size, age and primary education are important determinants of livelihood strategies. It also turned out to be significant regional variation in livelihood strategies, with more diversification in the southern region, and with regional variation in the role of ethnic and religious identity as determinants of livelihood strategies. In particular, we found that households from the Chewa community have more livelihood opportunities in the south, where they are in a minority.     

海南自贸港12个重点产业的科技支撑能力提升策略

12个重点产业对海南省经济社会发展具有重要意义,但普遍存在科技能力不足的问题.研究发现:海南高新技术产业发展相对滞后,相较于2013年,2018年规模以上工业企业的研发人员投入和专利产出均较大幅度减少;企业的研发主体地位不突出,企业在全社会研发经费中的占比低;全省科技投入强度弱,技术市场发展相对滞后,省内企业对技术的需求有待挖掘.借鉴农业机械和医药制造的科技支撑产业发展经验,提出强化政府引导、保障技术供给、挖掘技术需求方面的建议,着力提高科技对12个重点产业的支撑引领能力.     

Provincial Output Spillovers in China： Global Vector Autoregressive Approach

The paper uses a global vector autoregressive model to examine provincial output spillover effects in China. We find that there are effective output spillovers from Guangdong, Liaoning and Zhejiang to other provinces in China, but trivial effects from Shanghai, Shandong, Sichuan and Xinjiang, and negative effects from Beijing. Foreign direct investment (FDI) in Guangdong and Liaoning is the main channel for creating provincial output spillovers, compared with domestic investment and exports. However, FDI spillovers tend to decrease, with spillovers from exports and domestic investment rising over time, so that the spillover effects in Guangdong and Liaoning are non‐persistent and highly volatile. Other channels of output spillover, such as domestic investment, should be enhanced. Impacts of shock from government expenditure on GDP vary significantly across time and provinces; inland and western provinces are most negatively affected. The heterogeneous spillover structure shows that regional policies might achieve better results than nationwide policies in reducing regional disparity.     

浅谈橡胶粉末改性及其产品应用

简要介绍5～80目废旧橡胶粉末的表面的、化学的改性技术,使之跳开传统橡胶再生的增粘降弹思路,为废旧橡胶回收利用开启一个全新的无二次污染方式;并前瞻性地介绍了各种改性产品的应用领域及具体用途。