Impacts of Market Reform on Spatial Volatility of Maize Prices in Tanzania

Maize is one of the major staples and cash crops for many Tanzanians. Excessive volatility of maize prices destabilises farm income in maize‐growing regions and is likely to jeopardise nutrition and investment in many poor rural communities. This study investigates whether market reform policies in Tanzania have increased the volatility of maize prices, and identifies regional characteristics that can be attributed to the spatial price volatility. To achieve the objectives, an autoregressive conditional heteroskedasticity in mean (ARCH‐M) model is developed and estimated in this study. Results show that the reforms have increased farm‐gate prices and overall price volatility. Maize prices are lower in surplus and less developed regions than those in deficit and developed regions. Results also show that the developed and maize‐deficit regions, and regions bordering other countries have experienced less volatile prices than less developed, maize‐surplus and non‐bordering regions. Our findings indicate that investments in communication and transportation infrastructures from government and donor countries are likely to increase inter‐regional and international trade, thereby reducing the spatial price volatility in Tanzanian maize prices in the long run.     

维修工程系统--维修功能发展的契机

维修工程系统是一个集成的、严格的、柔性的、易于使用的工具，由许多模块组成，诸如逻辑系统设计模块、历史行为概率分布的调整模块、可靠性分析模块、系统与设备利用率和费用模块、关键零部件分析和更换管理模块等等。该系统与常用数据库有关系，用于数据的输入、输出。由此可见，雏修工程系统的应用，对公司维修领域的挑战以及对项目和模拟特殊环境都能提供答案。本文对于开发维修工程系统所需要的所有激励因素及其主要特征，根据信息学和维修基本知识作了说明。此外还通过维修工程系最重要的一些能力，在于改进维修功能，有助于企业取得世界级水平所具有的竞争能力。     

How farmers benefit from plant clinics: an impact study in Bolivia

Between 2000 and 2009, nine plant clinics in three agro-ecological areas of Bolivia (Andes, lowlands and valleys) served about 800 communities in an area roughly 300 × 100km. Over 6000 farmers consulted these clinics with 9000 queries. Many found the advice so useful that they visited the clinics repeatedly. A survey of 238 clinic users found that most adopted the clinics' recommendations. Fruit and vegetable growers who followed the clinic recommendations tended to spend less on pesticides. As for certain crops like potato, citrus and peach palm, a modest increase in pesticides helped improve the quality and quantity of the harvest. Farmers improved their incomes by following the clinics' advice. The poorest farmers enjoyed the greatest increase in income per hectare. This was the first study to explore the impact of plant clinics; future studies need to be improved, for example by obtaining baseline data and by comparing clinic users to their peers who have not used clinics.     

THE DETERMINANTS OF PRIVATE CAPITAL FLOWS IN EMERGING ECONOMIES: THE ROLE OF THE FED'S UNCONVENTIONAL MONETARY POLICY

Previous studies on the effect of the Fed's Unconventional Monetary Policy on capital flows in Emerging Economies have not been conclusive. I analyze if the effect of these policies on capital flows is heterogeneous between countries. This approach could be the smoking gun in this debate as I attempt to find evidence of a specific mechanism by which Unconventional Monetary Policy could affect the pattern of capital flows in Emerging Economies. The results suggest that Unconventional Monetary Policy has a significant effect on capital flows which depends on the type of measure adopted and the degree of financial exposure of each country to the United States. (JEL C23, E52, E58, F21, F32)