RECURRENT BUBBLES*

We study rational bubbles in a standard linear asset price model. We first consider a class of bubble processes driven by multiplicative i.i.d. shocks. We show that a bubble process in this class either diverges to infinity with probability one, converges to zero with probability one, or keeps fluctuating forever with probability one, depending on investors' “confidence” in expected bubble growth. We call a bubble process having the last property “recurrent.” We develop sufficient conditions for a bubble process to be recurrent when it is driven by non‐i.i.d. shocks, when the risk‐free interest rate is not constant, and when the process is driven by non‐i.i.d. shocks and the risk‐free interest rate is not constant. In the last case we demonstrate via simulation that there can be a prolonged period in which both the bubble and the interest rate stay close to zero.     

Association of Southeast Asian Nations Economic Integration: Developments and Challenges

The Association of Southeast Asian Nations (ASEAN) was formed in 1967 for geopolitical reasons, but faced with the competitive threat from the North American Free Trade Agreement and the European Single Market, it embarked in 1992 on the ASEAN Free Trade Area in goods, followed by liberalization of services trade and investment flows. A subsequent competitive threat from the rise of China and India led to the ASEAN Economic Community in 2003, targeted at creating a single market and production base and a competitive region with equitable economic development and integrated with the global economy. The ASEAN Economic Community is not quite a common market as it allows for only freer flows of capital and free flows of skilled labor. ASEAN's economic diversity led to difficulties with implementation and the need to narrow the development gap. ASEAN's dependence on global markets and investors led to the emphasis on open regionalism, support of the World Trade Organization, and free trade agreements with its major trade and investment partners.     

基于引力模型与0-1规划模型的省域经济区划——以江苏省为例

借助2008年统计数据,采用主成分法得到江苏各地级城市综合质量指数值;根据运输的时间成本与货币成本,计算江苏地级城市间经济距离;运用引力修正模型计算江苏地级城市间相互引力,并结合0-1规划模型划分经济区;依据经济区内县域间三次产业结构差异度与位置邻近性,划分经济亚区。研究表明：①江苏省可分为宁镇扬泰、苏锡常通、徐连宿、淮盐等4大经济区和15个经济亚区。②各城市连接的地区个数遵循Zipf定律,作为一、二级节点的南京和苏州统领全省经济空间网络,而南通、宿迁、盐城没有显著的联系对象。③江苏经济区空间分布逐渐由南北向格局转为南部呈东西向、北部呈南北向的格局。④各经济区内城市间的引力相差悬殊,南部较大,北部较小。省域尺度的经济区划,可为我国将来划分标准经济区奠定基础,也可为优化全省劳动地域分工格局提供依据。     

中国金融结构问题与M2/GDP偏高现象研究

上世纪90年代中期尤其是1997年之后,流动性过剩和资产价格剧烈波动成为中国经济运行中的典型现象,表现为货币供给量的变化和实体经济变量即产出和物价变化的脱节———M2/GDP偏高现象。根据宏观经济学的分析框架,货币总量与名义GDP之比作为衡量流动性过剩的尺度,反映了货币供求状态与实体宏观经济总量之间的关系。当流动性过剩成为持续现象时,说明相对于实体经济形成的总供给,货币市场持续出现超额供给,即货币市场提供的一部分货币资金没有流向实体经济,或投入到实体经济的货币资金没有形成真实的商品供给。由于现代货币制度下,货币供给量与金融体系提供的信贷规模和信贷资金流向紧密联系。因此考察流动性过剩现象应该更多关注金融结构,进而金融资源的配置方式和效率的变化。本文结合金融结构发展情况分析中国M2/GDP偏高现象,揭示金融结构发展中的问题并提出相应对策。     

Illusory revenues: Import tariffs in resource-rich and aid-rich economies

Where imports are financed predominantly by rents from resource extraction or aid the revenue generated by tariffs is illusory. Revenue earned by the tariff is offset by a reduction in the real value of aid and resource rents. Revenue is however moved between accounts in the government budget which, in the case of aid, may reduce the burden of donor conditionality. We demonstrate this proposition for a simple central case and show that the result is not overturned by generalisations around this case. We argue that trade policy formulation in such economies should recognize the illusory nature of tariff revenues.     

"Quicker and sicker" under Medicare's prospective payment system for hospitals: new evidence on an old issue from a national longitudinal survey

Medicare's prospective payment system for hospitals (PPS), introduced in the USA in 1983, replaced cost reimbursement with a system of fixed rates which created incentives for hospitals to control costs. Previous studies found that elderly patients were discharged from hospital "quicker and sicker" under PPS and concluded that families were coping at home. We analyse a national longitudinal survey, the first National Health and Nutrition Examination Survey and its Epidemiologic Followup Study, which includes data on more outcomes over a longer period than earlier studies. We find that the rate of admission to nursing homes from the community in the first weeks after a hospital discharge more than tripled under PPS, suggesting that families were not always able to cope. As another response to sicker patients, discharges directly to nursing homes from hospitals, which jumped initially under PPS, may have risen further when payment rates were tightened in the early 1990s. Hospital readmissions fell after the first few years. Our findings are strengthened by the fact that we control for patients' health using health information collected independently of hospital admission.     

甜玉米金银甜1号选育及栽培技术要点

金银甜1号是广西瑞恒种业有限公司以自交系MT089为母本,自交系F209为父本,通过系谱法选育育成。2011年通过广西品种审定委员会审定。该品种在南宁种植从出苗至鲜果穗采收期春季平均88天,秋季平均68天,2011—2013年种植平均鲜果穗产量875—1148Kg/667m2;品质评价汇总感观品质26.00分,气味6.00分,色泽6.25分,风味8.25分,甜度15.75分,柔嫩性8.50分,皮薄厚14.75分。总分为85.5分,按国家区试鲜食玉米感官等级指标评为二级。     

The structural transformation and aggregate productivity in Portugal

We document the substantial process of structural transformation—the reallocation of labor between agriculture, manufacturing, and services—and aggregate productivity growth undergone by Portugal between 1956 and 1995. We assess the quantitative role of sectoral labor productivity in accounting for these processes. We calibrate a model of the structural transformation to data for the United States and use the model to gain insight into the factors driving the structural transformation and aggregate productivity growth in Portugal. The model implies that Portugal features low and roughly constant relative productivity in agriculture and services (around 22%) and a modest but growing relative productivity in manufacturing (from 44 to 110%). We find that productivity growth in manufacturing accounts for most of the reduction of the aggregate productivity gap with the United States and that a further closing of this gap can only be accomplished via improvements in the relative productivity of services. This paper was written while the authors were affiliated with the Federal Reserve Bank of Richmond. We would like to thank the editor, two anonymous referees, and participants at the Third Conference on Portuguese Economic Development in the European Context organized by the Bank of Portugal for their comments. All errors are our own.     

Competition and the location of overseas assembly

Abstract. How does international competition affect overseas outsourcing? To address this question, this paper studies production decisions in the U.S.'s overseas assembly program (OAP). In this setting, a number of regularities emerge. First, prior participation is highly correlated with current participation, which suggests that sunk costs influence outsourcing choices. Second, increases in own‐country costs and declines in competitor‐country costs reduce participation probabilities. In addition, these persistence and cost effects are much larger for outsourcing in developing countries. Finally, outsourcing responses appear to reflect differences in 'market thickness,’ as cost sensitivity generally rises with competitor presence.     

Information and Communications Technology as a General-Purpose Technology: Evidence from US Industry Data

Abstract. Many people point to information and communications technology (ICT) as the key for understanding the acceleration in productivity in the United States since the mid-1990s. Stories of ICT as a 'general-purpose technology' suggest that measured total factor productivity (TFP) should rise in ICT-using sectors (reflecting either unobserved accumulation of intangible organizational capital; spillovers; or both), but with a long lag. Contemporaneously, however, investments in ICT may be associated with lower TFP as resources are diverted to reorganization and learning. We find that US industry results are consistent with general-purpose technology (GPT) stories: the acceleration after the mid-1990s was broad-based – located primarily in ICT-using industries rather than ICT-producing industries. Furthermore, industry TFP accelerations in the 2000s are positively correlated with (appropriately weighted) industry ICT capital growth in the 1990s. Indeed, as GPT stories would suggest, after controlling for past ICT investment, industry TFP accelerations are negatively correlated with increases in ICT usage in the 2000s.