physician induced demand for surgery following up the earlier findings by fuchs on surgeon induced demand this paper makes numerous data and econometric improvements in conducting a test of neoclassical and inducement theories a simultaneous equation model is used to estimate physician demand and equilibrium fees for surgery from a sample of 350 psus over the 1969 76 period the results provide definite support for the notion of competitive market failure particularly in large metropolitan areas other things equal fees and utilization are higher in surgeon rich areas although our estimated shift elasticities were only about one third those found by fuchs a statistically significant albeit small price elasticity of demand for surgery was also obtained in contrast to fuchs increasing monopoly and disequilibrium models are also tested without altering the basic findings where surgeons were in short supply their availability significantly affected surgery rates although a small supply effect was found in plentiful areas as well

tracking distortions in agriculture china and its accession to the world trade organization this article examines the impacts of china s accession to the world trade organization wto on prices in its agricultural sector the analysis uses a new methodology to estimate nominal protection rates in china s agricultural sector before its accession to the wto these new measures account for differences in commodity quality within china and between china and world markets the analysis shows that some of china s agricultural commodities are well above world market prices and others are well below the article also assesses market integration and efficiency in china it finds high degrees of integration between coastal and inland markets and between regional and village markets the remarkable improvements in market performance in recent years mean that if increased imports or exports affect china s domestic price near the border producers throughout most of china will feel the price shifts

approximating infinite horizon models in a complementarity format a primer in dynamic general equilibrium analysis abstract we demonstrate the advantages of the complementarity formulation for approximating infinite horizon equilibria in neoclassical growth models as compared with techniques originally developed for optimal planning models the complementarity approach does not require an ex ante specification of the growth rate in the terminal period and is therefore suitable for models with endogenous growth or short time horizons we also consider approximation issues in models with multiple infinitely lived agents changes in net indebtedness over a finite period are estimated as part of the model to obtain a precise approximation of the infinite horizon equilibria with a small number of time periods

technological change rediscovering the engine of productivity growth in china s rural economy abstract this paper focuses on measuring the relative importance of the role of technology versus that of institutional innovation in china s rural economy a six equation rice sector model explaining provincial level technology adoption yield and factor demand are econometrically estimated using data from china s 13 rice growing provinces for the period 1975 1990 growth decomposition analysis identifies technology adoption as the most important determinant of rice yield growth during 1978 1984 accounting for nearly 40 percent the change institutional reform accounted for 35 percent of the growth in 1985 1990 technology accounts for all of the increase in rice yields the study demonstrates earlier studies may have over estimated the impact of decollectivization

the creation and spread of technology and total factor productivity in china s agriculture the overall goal of this study is to create a framework for assessing the trends of china s national and international investment in agricultural research and to measure its impact on total factor productivity the main methodological contribution is to provide more convincing measures of crop specific technologies from china s national research program and of those imported from the international agricultural research system our results find that from 1980 to 1995 china s total factor productivity for rice wheat and maize grew rapidly and new technology accounts for most of the productivity growth

purchasing power parity and unit root tests using panel data abstract this paper reports the results of unit root tests for real exchange rates using a panel framework this panel approach provides greatly improved power compared to conventional univariate time series unit root tests we obtain evidence supporting ppp over the recent flexible exchange rate period for g 6 and oecd countries we show explicitly that failure to find such evidence in previous research was due to the low power of the tests

co2 emissions and poverty alleviation in china an empirical study based on municipal panel data abstract industrial transition and climate change regulation to reduce co2 emissions will affect employment and further influence social poverty in this study we measured co2 emissions and the poverty alleviation index based on socio economic and energy consumption statistic data from 286 municipal cities in china for 2007 2014 analyzed relationships between co2 emissions employment rate and poverty alleviation index using simultaneous equations and interpreted the mechanism by which co2 emissions influence social poverty at the municipal level the results indicate that average co2 emissions from china increased by 32 9 with a rapid initial rise and then steady growth from 2007 to 2014 while the average poverty alleviation index increased by 25 19 during the same period co2 emissions had a significant positive relationship with employment rate in all industries in addition employment rate was negatively correlated with poverty alleviation in primary industry and positively correlated with poverty alleviation in non agricultural industry studying the mechanisms for co2 emission impacts on poverty alleviation can provide important references for adapting to global climate change promoting sustainable development and safeguarding the legitimate development rights of all countries especially developing countries

are real exchange rates nonstationary evidence from a panel data test it is well documented that real exchange rates between the united states and many industrialized countries in the post bretton woods period are integrated this result implies that purchasing power parity ppp does not hold even as a long run relationship this paper demonstrates that the failure to reject the unit root hypothesis may result from the low power of existing univariate test procedures i test for unit roots in real exchange rates by employing a more powerful panel based procedure using both cpi and wpi real dollar exchange rate data i strongly reject the null hypothesis of a unit root my results provide overwhelming support for the long run ppp under the current float copyright 1996 by ohio state university press

price and quantity in international comparisons of health care expenditure an important omission from earlier cross national comparisons of health care expenditure has been the failure to distinguish between price and quantity using recent data on purchasing power parities the purpose of this article is to report some preliminary results regarding health care expenditure and quantity across 22 oecd countries the article concludes that contrary to what has been suggested in some recent articles the relative price of health care is not correlated to the aggregate per capita income the fraction of the national income that is devoted to health care provision increases with the per capita income regardless of whether health care is measured in terms of expenditure or quantity the relative price of health care has a rationing effect on the quantity of health care that is offered with a price alasticity close to minus one the latter finding means that the health care expenditure is not greater in countries with higherprices furthermore the differences in health care expendit

china s food economy to the twenty first century supply demand and trade this paper accounts for the structural changes now taking place in china and suggests that china is not likely to become either an enormous importer or exporter of grain ultimately though china s grain balances will depend on decisions made by chinese policymakers rather than natural resource constraints p v this abstract was borrowed from another version of this item

the impact of china s economic reforms on agricultural productivity growth this paper presents a method for assessing the relative importance of price increases and strengthened individual incentives due to the introduction of the responsibility system for the post 1978 increase in china s agricultural productivity data on post 1978 chinese agricultural performance suggest that a little over three quarters of the measured productivity increase is due to payment system changes and the remainder to price increases we also use our method to calculate incentive indices giving an estimate of the fraction of their marginal product that peasants received under the pre 1978 regime

real exchange rate behavior the recent float from the perspective of the past two centuries using annual data spanning two centuries for dollar sterling and franc sterling real exchange rates we find strong evidence of mean reverting real exchange rate behavior using simple stationary autoregressive models estimated on prefloat data we easily outperform nonstationary real exchange rate models in dynamic forecasting exercises over the recent float such stationary univariate equations explain 60 80 percent of the in sample variation in real exchange rates although the degree of short run persistence may be high the econometric estimates imply a half life of shocks to the real exchange rate of about 6 years for dollar sterling and a little under 3 years for franc sterling

medical care costs how much welfare loss hardly a week goes by without a front page newspaper article on rising health care costs and the uninsured in this article i focus mainly on costs arguing that the issue has been somewhat misconceived while the level of medical care spending in the u s is a cause for concern the welfare losses associated with rises in that level of spending may not be as large as the public rhetoric can make them seem in fact cost containment may not be as urgent as is widely supposed and some proposed cost containment policies may result in welfare losses for the insured and even increase the number of uninsured

irrigation agricultural performance and poverty reduction in china the overall goal of our paper is to understand the impact that irrigation in china has had on grain production and incomes in general and income and poverty alleviation in poor areas in particular the paper seeks to meet three objectives first we describe the relationship among irrigation status yields and household crop revenue second we seek to understand the magnitude and nature of the effect that irrigation has on yields and crop revenue finally we seek to understand the impact that irrigation has on incomes in poor areas our analysis shows that irrigation contributes to increases in yields for almost all crops and in income for farmers in all areas the importance of crop income in poor areas and the strong relationship between crop revenue and irrigation provides evidence of the importance of irrigation in past and future poverty alleviation in china we also show that in the majority of the villages that invested in new irrigation returns are positive even after accounting for increases in capital and production costs 2005 elsevier ltd all rights reserved

evaluating long term care policy options taking the family seriously we propose a dynamic non cooperative framework for long term care ltc decisions of families and use it to evaluate ltc policy options for the u s we first document the importance of informal caregiving and economic determinants of care arrangements we then build a heterogeneous agents model with imperfectly altruistic overlapping generations to account for the patterns we find a key innovation is the availability of informal care ic which is determined through intra family bargaining this opens up a new margin in response to policy and allows for informal insurance through home production of care our calibrated model captures the observed care arrangements well we study the implications of non means tested ic and formal care fc subsidies as well as changes to means tested medicaid we find that ic responds strongly to these policies an ic subsidy substantially reduces reliance on medicaid while the reduction of tax revenues due to lower labour supply by caregivers is modest there are large welfare gains from a combination of ic and fc subsidies even when combined with a reduction of the medicaid program

increasing evidence of purchasing power parity over the current float we conduct unit root tests of real exchange rates with the united states dollar and the german mark as base currencies using samples of data which begin in 1973 and end between 1982 and 1996 we find that as the sample is extended the evidence of ppp strengthens with panel but not univariate methods because of the sharp rise and fall of the dollar in the early 1980s rejections of the unit root null do not monotonically increase with the sample size the evidence of ppp is uniformly stronger when the mark is used as the base currency

health insurance and the demand for medical care evidence from a randomized experiment we estimate how cost sharing the portion of the bill the patient pays affects the demand for medical services the data come from a randomized experiment a catastrophic insurance plan reduces expenditures 31 percent relative to zero out of pocket price the price elasticity is approximately 0 2 we reject the hypothesis that less favorable coverage of outpatient services increases total expenditure for example by deterring preventive care or inducing hospitalization

the re emergence of ppp in the 1990s abstract in this paper we investigate purchasing power parity ppp in a panel with 17 countries for the period 1972 through 1996 the novel feature of our panel methodology is that results are invariant to the choice of a benchmark on numeraire currency in the panel we allow individual country effects in the relation between prices and exchange rates in this way we can identify the currency pairs for which ppp holds or does not hold we conclude that there is substantive evidence for ppp although not to the same extent for every currency evidence in favor of ppp is strongest for many exchange rates relative to the dmark and weakest for the japanese yen for this currency a trend like variable like productivity growth is missing

agricultural productivity and sources of growth in south asia estimates of partial factor productivity growth for rice and wheat in india bangladesh and pakistan show relatively rapid growth in yields per hectare since adoption of modern rice and wheat varieties began in the mid to late 1960s byerlee rosegrant while partial factor productivity growth for rice and wheat in south asia has been extensively analyzed there is relatively little understanding of total factor productivity growth and the sources of productivity growth in the crops sector or of the relative contribution to output growth from productivity growth compared to increased factor use this paper assesses total factor productivity tfp growth in india examines the sources of productivity growth and estimates the rates of return to public investments in research and extension a comparison is made with results for bangladesh dey and evenson and pakistan azam bloom and evenson the paper describes the methodology for estimation of tfp decomposition of tfp and estimation of rates of return to public investments describes the data and presents results and policy implications

projecting long term medical spending growth we present a dynamic general equilibrium model of the u s economy and the medical sector in which the adoption of new medical treatments is endogenous and the demand for medical services is conditional on the state of technology we use this model to prepare 75 year medical spending forecasts and a projection of the medicare actuarial balance and we compare our results to those obtained from a method that has been used by government actuaries our baseline forecast predicts slower health spending growth in the long run and a lower medicare actuarial deficit relative to the previous projection methodology

technical and allocative efficiency of irrigation water use in the guanzhong plain china due to increasing water scarcity accelerating industrialization and urbanization efficiency of irrigation water use in northern china needs urgent improvement based on a sample of 347 wheat growers in the guanzhong plain this paper simultaneously estimates a production function and its corresponding first order conditions for cost minimization to analyze efficiency of irrigation water use the main findings are that average technical allocative and overall economic efficiency are 0 35 0 86 and 0 80 respectively in a second stage analysis we find that farmers perception of water scarcity water price and irrigation infrastructure increase irrigation water allocative efficiency while land fragmentation decreases it we also show that farmers income loss due to higher water prices can be offset by increasing irrigation water use efficiency

rural reforms and agricultural growth in china this paper employs province level panel data to assess the contributions of decollectivization price adjustments and other reforms to china s agricultural growth in the reform period decollectivization is found to improve total factor productivity and to account for about half of the output growth during 1978 84 the adjustment in state procurement prices also contributed positively to output growth its impact came mainly from the responses in input use the effect of other market related reforms on productivity and output growth was very small reasons for slowdown in agricultural growth after 1984 are also analyzed copyright 1992 by american economic association

gender agricultural production and the theory of the household virtually all models of the household assume that the allocation of resources is pareto efficient within many african households agricultural production occurs on many plots controlled by different members of the household pareto efficiency implies that factors should be allocated efficiently across these plots i find in contrast that plots controlled by women are farmed much less intensively than similar plots within the household controlled by men the estimates imply that about 6 percent of output is lost because of inefficient factor allocation within the household the paper suggests a new approach to modeling intrahousehold allocation consistent with the empirical results

on the effect of income and relative price on demand for health care ec evidence this paper demonstrates that the relative price of health care could be used to explain the conflicting results of the empirical studies which attempt to measure the income elasticity of demand our empirical results based on a conventional model and cross national data set for the ec show that whereas health care may be labelled as a luxury good the large income effect can be interpreted as merely offsetting the price effect

multi country evidence on the behavior of purchasing power parity under the current float abstract using panel data for the united states and 22 other oecd countries for the current float this paper presents evidence that despite substantial short term perturbations purchasing power parity actually performed much better than commonly believed average rates of growth of real exchange rates over long horizons bear little relationship either to average rates of growth of nominal exchange rates or to average inflation differentials thus implying a close to one to one relation between average rates of growth of nominal exchange rates and average inflation differentials panel data variants of standard unit root tests suggest that the real exchange rates of these countries can be characterized as mean reverting

effects of technological change and institutional reform on production growth in chinese agriculture recent rapid agricultural production growth in chinese agriculture could be attributed to an increase in inputs technological change and institutional reform an accounting approach was used to separate the relative contribution of these three factors institutional change like the introduction of the household production responsibility system has contributed to past growth in production however technological change is crucial to furthering production growth because of the limited potential for significant increase in the use of conventional inputs in particular land continued institutional change must accompany corresponding technological changes

the value of life and the rise in health spending over the past half century americans spent a rising share of total economic resources on health and enjoyed substantially longer lives as a result debate on health policy often focuses on limiting the growth of health spending we investigate an issue central to this debate is the growth of health spending a rational response to changing economic conditions notably the growth of income per person we develop a model based on standard economic assumptions and argue that this is indeed the case standard preferences of the kind used widely in economics to study consumption asset pricing and labor supply imply that health spending is a superior good with an income elasticity well above one as people get richer and consumption rises the marginal utility of consumption falls rapidly spending on health to extend life allows individuals to purchase additional periods of utility the marginal utility of life extension does not decline as a result the optimal composition of total spending shifts toward health and the health share grows along with income in projections based on the quantitative analysis of our model the optimal health share of spending seems likely to exceed 30 percent by the middle of the century

public investment and china s long term food security under wto abstract as the world s most populous nation china has taken various measures to increase grain production output in the past several decades however many of the policy interventions to promote grain production are not in conformity with wto rules and also lead to misallocation of resources and loss of production efficiency while adequately steady growth of grain output may still be a policy goal for the world s most populous nation with continuous population growth and economic development it is crucial that the country moves away from many of its past measures and explores alternative policy tools to strengthen domestic grain production by using agricultural research and irrigation as a proxy this paper examines the effects of public investment in irrigation and agricultural research on the output increase of grain production in china in a crop specific manner the research finds that increasing public investment in agricultural research will bring about higher output in a cost effective manner increasing public investment in agricultural r d etc should be considered with high priority in the future to be utilized as a policy tool to enhance long term food security

agricultural water management and poverty in ethiopia the main focus of this article is to explore whether access to selected agricultural water management awm technologies has led to significant reduction in poverty and if they did so to identify which technologies had higher impacts in measuring impact we estimated the average treatment effect for the treated on crop income and measured the differences in consumption expenditures per adult equivalent of those with access and without access using matched data the estimated average treatment effect was significant and amounted to usd 82 per season moreover there was 24 less poverty incidence among users of awm technologies compared to nonusers all technologies were found to have significant poverty reducing impacts with micro dams deep wells river diversions and ponds leading to 37 26 11 and 9 reduction in poverty incidence compared to rainfed system finally our study identified the most important correlates of poverty on the basis this we made the policy recommendations to build assets awm technologies livestock etc to enhance human resource development and improve the functioning of labor markets for enhanced impact of awm technologies on poverty

new panel unit root tests of ppp abstract we use the new panel unit root tests im k s pesaran m h shin y 1995 testing for unit roots in heterogenous panels wp 9526 dae university of cambridge revised march 1997 to analyse the stationarity of real exchange rates for the g10 economies and switzerland our results for monthly data 1973 96 indicate mean reversion in real exchange rates and a half life of under three years for one off shocks

re examining long run purchasing power parity abstract our results complement the recent findings of real exchange rates as stationary processes applying a battery of unit root tests can be problematic since the tests are sensitive to the specifics of the time series process the novelty of our approach is in emphasizing the information content of the data to distinguish between the competing processes stationary and non stationary arima processes are fitted to the us uk real exchange rate series covering 134 years artificial data are generated and the small sample distributions of the chosen test statistics are computed under each of the two hypotheses the values of the actual sample statistics seem to come rather from the stationary than from the non stationary process

searching for evidence of long run ppp from a post bretton woods panel separating the wheat from the chaff abstract this paper reexamines the issue of long run ppp using multiple panel tests in the framework of confirmatory analysis application of six panel tests under competing null hypotheses to the real exchange rates of 21 industrial countries yields seemingly contradictory evidence on the parity during the post bretton woods period regardless of numeraire currency four i 1 panel tests unanimously reject the null hypothesis in favor of long run ppp whereas two i 0 panel tests lend little support to the parity at conventional significance levels confirmatory analysis suggests that this puzzling result can be explained either by nonlinear dynamics of the real exchange rates or by a mixture of i 0 and i 1 series in the panel monte carlo experiments indicate that potential mix of i 0 and i 1 series is more relevant to the empirical finding the use of a sequential classification method sorts out six real exchange rates which exhibit most persistent deviations from long run equilibrium systematic behavior of these series can be characterized better by country specific factors than by observable macroeconomic variables

reforms investment and poverty in rural china shenggen faninternational food policy research institute and institute of agriculturaleconomics of the chinese academy of agricultural scienceslinxiu zhangcenter for chinese agricultural policy of the chinese academy of sciencesxiaobo zhanginternational food policy research institutei introductionchina is one of the few countries in the developing world that has madeprogress in reducing its total number of poor over the past 25 years

how access to irrigation influences poverty and livelihoods a case study from sri lanka abstractthis study combines a livelihoods approach with a regression approach to quantify the effectiveness of irrigation infrastructure investment on improving people s livelihood strategies using a unique dataset based on households in southern sri lanka and a natural experimental setting we estimate from a two stage income regression model to show that irrigation access has a positive effect on income through livelihood choices we also show through qualitative approaches that factors not linked to irrigation infrastructure may contribute to changes in livelihood portfolios in addition we highlight factors that result in certain households being unable to move out of poverty despite access to the improved irrigation infrastructure

how sure are we about purchasing power parity panel evidence with the null of stationary real exchange rates this article presents evidence on mean reversion in industrial countries real exchange rates in a setup that accounts naturally for cross sectional dependence is invariant to the benchmark currency and actually tests for the null of interest i e purchasing power parity our results are based on the kwiatkowski et al 1992 test for the stationarity null generalized in a multivariate random walk plus noise model by nyblom and harvey 2000

health care is an individual necessity and a national luxury applying multilevel decision models to the analysis of health care expenditures health care is neither a necessity or a luxury it is both since the income elasticity varies with the level of analysis with insurance individual income elasticities are typically near zero while national health expenditure elasticities are commonly greater than 1 0 the debate over whether health care is or is not a luxury good arises primarily from the failure to specify levels of analysis clearly so as to distinguish variation within groups from variation between groups apparently contradictory empirical results are shown to be consistent with a simple nested multilevel model of health care spending

the overvaluation of purchasing power parity abstract recent panel studies of purchasing power parity have reported strong evidence of mean reversion in real exchange rates however these studies fail to control for cross sectional dependence in the data this failure has dramatic consequences raising the significance level of tests with a nominal size of 5 percent to as much as 50 percent it is shown in this paper that controlling for cross sectional dependence no evidence against the random walk null can be found in panels of up to 64 real exchange rates this finding cannot be attributed to low power as there is ample power in panels of this size to reject the unit root null