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21.
Rising urban and environmental demand for water has created growing pressure to reallocate water from traditional agricultural uses. The evolution of water markets has been more complicated than those for other resources. In this paper, we first explain these differences by examining water rights and regulatory issues. Second, we place our research in the context of the economics literature on water marketing. Third, we present new, comprehensive data on prices and the extent, nature, and timing of water transfers across 12 western states from 1987 to 2005. We find that prices are higher for agriculture-to-urban trades versus within-agriculture trades, in part, reflecting the differences in marginal values between the two uses. Prices for urban use are also growing relative to agricultural use. Markets are responding in that the number of agriculture-to-urban transactions is rising, whereas the number of agriculture-to-agriculture transfers is not. Further, there is a shift from using short-term leases to using multiyear leases of water and permanent sales of water rights. This pattern underscores the need to consider the amounts of water obligated over time rather than examining only annual flows in assessing the quantities of water traded as is the common practice in the literature. Considering water obligated over time, termed committed water, we find significantly more is transferred and the direction of trading is different than if the focus is on annual flows. Finally, the data reveal considerable variation in water trading across the states. ( JEL Q2, N5, L5, K3) 相似文献
22.
Professor Robert Harris, Department of Social Policy and Professional Studies. The University of Hull. Hull, HU6 7RX. Summary This paper traces the life history of the care order (criminal)from its inception in the 1969 Children and Young Persons Actto its abolition in the 1989 Children Act. It is argued thatthe care order (criminal) is a microcosm of the central ambiguityof the juvenile justice system, and that its history accordinglymirrors that of juvenile justice itself. An empirical studyis then reported which demonstrates that the role of the provisionsince 1983 has been complex, but that it has catered for threedistinct groups of offenders, of whom only one poses a policyproblem. The residence requirement solution tothis problem in the 1989 Children Act is welcomed as havinga better chance of sustaining the different tasks of the juvenilejustice system. 相似文献
23.
ROBERT L. PAIGE A. ALEXANDRE TRINDADE P. HARSHINI FERNANDO 《Scandinavian Journal of Statistics》2009,36(1):98-111
Abstract. We propose an easy to implement method for making small sample parametric inference about the root of an estimating equation expressible as a quadratic form in normal random variables. It is based on saddlepoint approximations to the distribution of the estimating equation whose unique root is a parameter's maximum likelihood estimator (MLE), while substituting conditional MLEs for the remaining (nuisance) parameters. Monotoncity of the estimating equation in its parameter argument enables us to relate these approximations to those for the estimator of interest. The proposed method is equivalent to a parametric bootstrap percentile approach where Monte Carlo simulation is replaced by saddlepoint approximation. It finds applications in many areas of statistics including, nonlinear regression, time series analysis, inference on ratios of regression parameters in linear models and calibration. We demonstrate the method in the context of some classical examples from nonlinear regression models and ratios of regression parameter problems. Simulation results for these show that the proposed method, apart from being generally easier to implement, yields confidence intervals with lengths and coverage probabilities that compare favourably with those obtained from several competing methods proposed in the literature over the past half-century. 相似文献
24.
Banks often charge implicitly for their services via interest spreads, instead of explicit fees. Much of bank output thus has to be estimated indirectly. In contrast to current statistical practice, dynamic optimizing models of banks argue that compensation for bearing systematic risk is not part of bank output. We apply these models and find that in the U.S. National Accounts between 1997 and 2007, bank output was overestimated by 21% and gross domestic product (GDP) by 0.3%. Compared with current methods, our new estimates imply more plausible estimates of the income share of capital and the return on fixed capital of the banking industry. (JEL E01, E44, O47) 相似文献
25.
Although computers are universal in the classroom, nearly 20 million children in the United States do not have computers in their homes. Surprisingly, only a few previous studies explore the role of home computers in the educational process. Home computers might be very useful for completing school assignments, but they might also represent a distraction for teenagers. We use several identification strategies and panel data from the two main U.S. data sets that include recent information on computer ownership among children—the 2000–2003 Current Population Survey (CPS) Computer and Internet Use Supplements matched to the CPS basic monthly files and the National Longitudinal Survey of Youth 1997 (NLSY97)—to explore the causal relationship between computer ownership and high school graduation and other educational outcomes. Teenagers who have access to home computers are 6–8 percentage points more likely to graduate from high school than teenagers who do not have home computers after controlling for individual, parental, and family characteristics. We generally find evidence of positive relationships between home computers and educational outcomes using several identification strategies, including controlling for typically unobservable home environment and extracurricular activities in the NLSY97, fixed effects models, instrumental variables, and including future computer ownership and falsification tests. Home computers may increase high school graduation by reducing nonproductive activities, such as truancy and crime, among children in addition to making it easier to complete school assignments (JEL I2). 相似文献
26.
ROBERT LANNING 《Journal of historical sociology》1991,4(4):359-379
Abstract This essay examines the use of object lessons as a component of 19th century Ontario educational practice, and demonstrates their development to interactive lessons in moral and cultural observation. It is demonstrated that the laws of nature and society were perceived as parallel systems of order. The essay then demonstrates the use of these pedagogical forms in the management of classroom situations. 相似文献
27.
28.
ECONOMIC EFFECTS OF CURRENCY UNIONS 总被引:3,自引:0,他引:3
We develop a new instrumental-variable (IV) approach to estimate the effects of different exchange rate regimes on bilateral outcomes. The basic idea is that the characteristics of the exchange rate between two countries are partially related to the independent decisions of these countries to peg—explicitly or de facto—to a third currency, notably that of a main anchor. This component of the exchange rate regime can be used as an IV in regressions of bilateral outcomes. We apply the methodology to study the economic effects of currency unions. The likelihood that two countries independently adopt the currency of the same anchor country is used as an instrument for whether they share a common currency. We find that sharing a common currency enhances trade, increases price comovements, and decreases the comovement of real gross domestic product shocks. ( JEL C3, F3, F4) 相似文献
29.
JAMES P. HOBERT GALIN L. JONES CHRISTIAN P. ROBERT 《Scandinavian Journal of Statistics》2006,33(1):37-51
Abstract. Let π denote an intractable probability distribution that we would like to explore. Suppose that we have a positive recurrent, irreducible Markov chain that satisfies a minorization condition and has π as its invariant measure. We provide a method of using simulations from the Markov chain to construct a statistical estimate of π from which it is straightforward to sample. We show that this estimate is 'strongly consistent' in the sense that the total variation distance between the estimate and π converges to 0 almost surely as the number of simulations grows. Moreover, we use some recently developed asymptotic results to provide guidance as to how much simulation is necessary. Draws from the estimate can be used to approximate features of π or as intelligent starting values for the original Markov chain. We illustrate our methods with two examples. 相似文献
30.