Value,Structure and Spatial Distribution of Interprovincial Trade in China

This study uses two different datasets to explore the stylized facts of interprovincial trade in China during the recent two decades. One dataset provides the magnitude of bilateral interprovincial goods trade calculated using firms' value‐added tax invoices. The other supplies estimates of interprovincial trade using provincial input–output tables. We find that China has both a large value and a high growth rate of interprovincial trade, but there still exists a home bias in internal trade for most provinces. In addition, disaggregation by product shows that the manufacturing sector has the largest share of interprovincial trade and this share continues to grow. Finally, the spatial distribution of trade suggests that all provinces can be clustered into a smaller number of trade areas with large intra‐cluster trade. Therefore, China's central government should make more effort to reduce local protection, stimulate domestic demand and coordinate interregional trade among local jurisdictions.     

PORTFOLIOS OF AMERICAN OPTIONS UNDER GENERAL PREFERENCES: RESULTS AND COUNTEREXAMPLES

We consider the optimal exercise of a portfolio of American call options in an incomplete market. Options are written on a single underlying asset but may have different characteristics of strikes, maturities, and vesting dates. Our motivation is to model the decision faced by an employee who is granted options periodically on the stock of her company, and who is not permitted to trade this stock. The first part of our study considers the optimal exercise of single options. We prove results under minimal assumptions and give several counterexamples where these assumptions fail—describing the shape and nesting properties of the exercise regions. The second part of the study considers portfolios of options with differing characteristics. The main result is that options with comonotonic strike, maturity, and vesting date should be exercised in order of increasing strike. It is true under weak assumptions on preferences and requires no assumptions on prices. Potentially the exercise ordering result can significantly reduce the complexity of computations in a particular example. This is illustrated by solving the resulting dynamic programming problem in a constant absolute risk aversion utility indifference model.     

A numerical simulation analysis of (Hukou) labour mobility restrictions in China

We use numerical simulation methods to analyze the Hukou system of permanent registration in China which many believe has supported growing relative inequality over the last 20 years by restraining labour migration both between the countryside and urban areas and between regions and cities. Our aim is to inject economic modelling into the debate on sources of inequality in China which thus far has been largely statistical. We first use a model with homogeneous labour in which wage inequality across various geographical divides in China is supported solely by quantity based migration restrictions (urban–rural areas, rich–poor regions, eastern-central and western (non-coastal) zones, eastern and central-western development zones, eastern–central–western zones, more disaggregated 6 regional classifications, and an all 31 provincial classification). We calibrate this model to base case data and when we remove migration restrictions all wage and most income inequality disappears. Results from this model structure points to a significant role for Hukou restrictions in supporting inequality in China. We then present a further model extension in which urban house price rises retard rural–urban migration. The impacts of removing Hukou restrictions on migration are smaller, but are still significant. Finally, we modify the model to capture labour productivity differences across regions, calibrating the modified model to estimates of both national and regional Gini coefficients. Removal of migration barriers is again inequality improving but less so.     

Housing price and household savings rates: evidence from China

This article investigates the effect of house prices on household savings rates in urban China employing the 2002 and 2007 data of the Chinese Households Income Project (CHIP). We find that the rapid appreciation of house prices cannot explain high Chinese households’ savings rates and the rising of Chinese savings rates. On the contrary, we find a negative relationship between house prices and household savings rates for home renters and homeowners. We do not find any evidence of ‘savings for housing purchase’ for young home renters when house prices increase. Their savings rates declined during housing market booms in recent 10?years. Savings rates of homeowners possessing multiple housing have decreased more because of ‘the pure housing wealth effects.’     

Discreteness and the Welfare Cost of Labor Supply Tax Distortions*

We compare the welfare costs of tax distortions of labor supply in one‐ and two‐member household discrete and continuous choice labor supply (leisure consumption) models calibrated to the same aggregate uncompensated labor supply elasticities. In the discrete models, taxes induce a large response from a subset of the population, whereas the majority of the population exhibits unchanged behavior. In contrast, the majority of the population reacts to tax changes in continuous models. Discrete choice matters as the welfare costs of similar taxes vary significantly when individuals face discrete labor supply choices from when they choose working hours continuously.     

Soil management in relation to sustainable agriculture and ecosystem services

Requirements for research, practices and policies affecting soil management in relation to global food security are reviewed. Managing soil organic carbon (C) is central because soil organic matter influences numerous soil properties relevant to ecosystem functioning and crop growth. Even small changes in total C content can have disproportionately large impacts on key soil physical properties. Practices to encourage maintenance of soil C are important for ensuring sustainability of all soil functions. Soil is a major store of C within the biosphere – increases or decreases in this large stock can either mitigate or worsen climate change. Deforestation, conversion of grasslands to arable cropping and drainage of wetlands all cause emission of C; policies and international action to minimise these changes are urgently required. Sequestration of C in soil can contribute to climate change mitigation but the real impact of different options is often misunderstood. Some changes in management that are beneficial for soil C, increase emissions of nitrous oxide (a powerful greenhouse gas) thus cancelling the benefit. Research on soil physical processes and their interactions with roots can lead to improved and novel practices to improve crop access to water and nutrients. Increased understanding of root function has implications for selection and breeding of crops to maximise capture of water and nutrients. Roots are also a means of delivering natural plant-produced chemicals into soil with potentially beneficial impacts. These include biocontrol of soil-borne pests and diseases and inhibition of the nitrification process in soil (conversion of ammonium to nitrate) with possible benefits for improved nitrogen use efficiency and decreased nitrous oxide emission. The application of molecular methods to studies of soil organisms, and their interactions with roots, is providing new understanding of soil ecology and the basis for novel practical applications. Policy makers and those concerned with development of management approaches need to keep a watching brief on emerging possibilities from this fast-moving area of science. Nutrient management is a key challenge for global food production: there is an urgent need to increase nutrient availability to crops grown by smallholder farmers in developing countries. Many changes in practices including inter-cropping, inclusion of nitrogen-fixing crops, agroforestry and improved recycling have been clearly demonstrated to be beneficial: facilitating policies and practical strategies are needed to make these widely available, taking account of local economic and social conditions. In the longer term fertilizers will be essential for food security: policies and actions are needed to make these available and affordable to small farmers. In developed regions, and those developing rapidly such as China, strategies and policies to manage more precisely the necessarily large flows of nutrients in ways that minimise environmental damage are essential. A specific issue is to minimise emissions of nitrous oxide whilst ensuring sufficient nitrogen is available for adequate food production. Application of known strategies (through either regulation or education), technological developments, and continued research to improve understanding of basic processes will all play a part. Decreasing soil erosion is essential, both to maintain the soil resource and to minimise downstream damage such as sedimentation of rivers with adverse impacts on fisheries. Practical strategies are well known but often have financial implications for farmers. Examples of systems for paying one group of land users for ecosystem services affecting others exist in several parts of the world and serve as a model.     

Technological change and China's regional disparities — A calibrated equilibrium analysis

We in this paper assess the impacts of technological change on China's regional disparities using a general equilibrium model of multiple regions and multiple sectors. We use the most recent available Chinese interregional data to calibrate the model parameters for 1987 and 2000. We then assess the impacts of neutral, biased, and aggregate technological changes on China's regional disparity by conducting counterfactual experiments. The results generally suggest that China's overall technological change between 1987 and 2000 has increased China's regional disparities. The results also suggest that neutral technological change reduces China's regional disparities while biased technological change increases disparities and the influences of the latter outweigh those of the former and the net effects of technological changes on regional disparities are increasing.     

The Higher Educational Transformation of China and Its Global Implications

This paper discusses the major transformation of higher education that has been under way in China since 1999 and evaluates its potential global implications. Reflecting China’s commitment to continued high growth, this transformation focuses on major new resource commitments to tertiary education and significant changes in organisational form. All of these changes have already had large impacts on China’s higher educational system and are beginning to be felt by the global educational structure. This focus on tertiary education differentiates the Chinese case from other countries who earlier at similar stages of development instead stressed primary and secondary education.     

Assessing the Benefits to Developing Countries of Liberalisation in Services Trade

This paper discusses the potential impacts of services trade liberalisation on developing countries and reviews existing quantitative studies. Its purpose is to distill themes from current literature rather than to advocate specific policy changes. The picture emerging is one of valiant attempts to quantify in the presence of formidable analytical and data problems yielding only a clouded image of likely impacts on trade, consumption, production and welfare emerging to the point that the policy implications of results are not always clear. A central intuition would seem to be that with genuine two‐sided (OECD/non‐OECD) liberalisation in services that are seemingly considerably labour‐intensive in delivery, the potential should be there for significant developing country gains from global liberalisation allowing full cross‐border delivery. However, this picture is neither fully endorsed by available studies, neither is it explicitly contradicted. This seems to be the case for a number of reasons. One difficulty with the studies is that the conceptual underpinnings of what determines trade in services and how this trade differs analytically from that of trade in goods (if at all) is an issue prior to assessments of impacts of liberalisation of trade in services on developing countries being discussed. Key issues here are the treatment of mobility for service providers (both firms and workers), and the differing analytical structures needed to analyse individual service items (banking, insurance, telecoms, etc.). Some recent analytical work suggests that liber‐alisation in some service items, such as banking, need not always yield gains, and this contrasts with quantitative studies where analytical structures mirror conventional trade in goods treatments. The discussion and measurement of barriers to service trade in both developed and developing countries is also problematic. One is talking of domestic regulation, entry barriers, portability of providers, competition policy regimes more so than only barriers at national borders, as with tariffs. Both representing and quantifying such barriers raise major difficulties, and these are also spelled out in the paper. Which barriers actually restrict trade, and which do not because they are redundant is one issue, for instance. It is also often misleading to represent barriers in simple ad valorem equivalent form. As a result, numerical modelling work on the effects of service trade barriers which is based on ad valorem equivalent modelling is often not fully convincing. In addition, individual country results vary considerably across studies in ways that it is frequently hard for outsiders to understand. Studies do, however, point towards a tentative conclusion that effects are small and positive for developed and most developing countries if FDI flow changes accompanying service trade liberalisation are excluded from the analysis, but much larger and more variable across countries if they are present. This could be taken to suggest that mode 3 GATS liberalisation (roughly captured in some studies) might be important for developing countries; but mode 4 GATS liberalisation could be even more important given large barriers to labour flows across countries. Thus, if service trade liberalisation is thought of primarily as a surrogate for improved functioning of global factor markets in which more capital flows to developing countries and more labour flows from them to developed countries, then developing countries could benefit in a major way from genuine two‐sided (OECD/non‐OECD) liberalisation. Developing countries fear, however, that in global negotiations on services liberalisation where there is an asymmetry of power that largely one‐sided liberalisation may be the outcome, and their gains will be correspondingly limited. The paper concludes by evaluating econometric studies on linkage between services liberalisation and country growth rules, and briefly discusses some key sectoral issues in health services and transportation.