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排序方式: 共有2047条查询结果,搜索用时 15 毫秒
71.
72.
Irrigation water productivity in Cambodian rice systems 总被引:1,自引:0,他引:1
Knowledge of the marginal productivity of water is crucial for decisions about its allocation between uses, which is particularly important in the context of increasing competition for water. Using primary, plot‐level panel data, this article estimates the marginal productivity of water from supplementary irrigation in lowland rice systems in Cambodia, taking into account farmer and plot heterogeneity as well as self‐selection of supplementary irrigation. Our estimates indicate a range of elasticities for rice output with respect to water inputs of between 0.057 and 0.069 for wet season production, substantially lower than previous estimates based on either aggregate or trial data. We discuss the policy implications of these results, in particular with respect to the utility of demand management policies and the challenges they pose to the decentralization of water management to Farmer Water Users Groups. 相似文献
73.
74.
Christopher Malikane 《Applied economics》2017,49(37):3741-3750
We derive a new Keynesian IS curve that is augmented to capture the direct effects of the labour share on output. Our derivation shows that the direct effect of the labour share on output is ambiguous. Furthermore, theory suggests that the expected labour share negatively affects output. Empirically, we find that the labour share plays a significant role in driving output dynamics. However contrary to theoretical expectation, the expected labour share positively affects output in some cases, a finding we call the ‘labour share puzzle’. We also find that over time, there seems to be a general shift in aggregate demand dynamics towards being profit-led, i.e. rising labour share decreases output. We conclude that policymakers should not ignore the labour share in their decisions. 相似文献
75.
Stephen J. Carson Robert D. Jewell Christopher Joiner 《Journal of the Academy of Marketing Science》2007,35(2):172-183
Prior empirical research suggests that consumers perceive pioneers as more prototypical (i.e., representative) of their product
categories than me-too followers. This prototypicality advantage is believed to contribute to an enduring marketplace advantage
for the pioneer. We extend research into pioneering prototypicality advantages by considering the ramifications of simultaneous
product design (i.e., product attribute) evolutions. We hypothesize that the simultaneous evolution of product designs of
both the pioneer and me-too will diminish the pioneer’s prototypicality advantage over the me-too, even though the me-too
does not initiate the change. To test our hypotheses, we create an experimental environment consisting of four cells, each
corresponding to a different marketplace scenario: a no-change condition; a simultaneous-evolution condition; a pioneer-updates-first
condition; and a leapfrogging (i.e., me-too updates first) condition. The results suggest that simultaneous design evolutions
can diminish the pioneer’s prototypicality advantage. As a result, me-too entry may be a more attractive strategy in the long-run
than currently believed in product categories characterized by substantial design evolution.
相似文献
Christopher JoinerEmail: |
76.
James Christopher Westland 《International Journal of Intelligent Systems in Accounting, Finance & Management》2020,27(2):95-107
This research developed and tested machine learning models to predict significant credit card fraud in corporate systems using Sarbanes‐Oxley (SOX) reports, news reports of breaches and Fama‐French risk factors (FF). Exploratory analysis found that SOX information predicted several types of security breaches, with the strongest performance in predicting credit card fraud. A systematic tuning of hyperparamters for a suite of machine learning models, starting with a random forest, an extremely‐randomized forest, a random grid of gradient boosting machines (GBMs), a random grid of deep neural nets, a fixed grid of general linear models where assembled into two trained stacked ensemble models optimized for F1 performance; an ensemble that contained all the models, and an ensemble containing just the best performing model from each algorithm class. Tuned GBMs performed best under all conditions. Without FF, models yielded an AUC of 99.3% and closeness of the training and validation matrices confirm that the model is robust. The most important predictors were firm specific, as would be expected, since control weaknesses vary at the firm level. Audit firm fees were the most important non‐firm‐specific predictors. Adding FF to the model rendered perfect prediction (100%) in the trained confusion matrix and AUC of 99.8%. The most important predictors of credit card fraud were the FF coefficient for the High book‐to‐market ratio Minus Low factor. The second most influential variable was the year of reporting, and third most important was the Fama‐French 3‐factor model R2 – together these described most of the variance in credit card fraud occurrence. In all cases the four major SOX specific opinions rendered by auditors and the signed SOX report had little predictive influence. 相似文献
77.
When agents are liquidity constrained, two options exist – sell assets or borrow. We compare the allocations arising in two economies: in one, agents can sell government (outside) bonds and in the other they can borrow by issuing (inside) bonds. All transactions are voluntary, implying no taxation or forced redemption of private debt. We show that any allocation in the economy with inside bonds can be replicated in the economy with outside bonds but that the converse is not true. However, the optimal policy in each economy makes the allocations equivalent. 相似文献
78.
79.
This paper focuses on the innovative actions of entrepreneurs, namely their tendency to reveal the intellectual capital that
results from their research efforts either in the form of public knowledge (publications) or private knowledge (patents).
Using data collected by the National Research Council within the US National Academies from their survey of firm’s that received
National Institutes of Health phase II Small Business Innovation Research awards between 1992 and 2001, we find that entrepreneurs
with academic backgrounds are more likely to publish their intellectual capital compared with entrepreneurs with business
backgrounds, who are more likely to patent their intellectual capital. We also find that, when universities are research partners,
their presence complements the tendencies of academic entrepreneurs but does not offset those of business entrepreneurs. 相似文献
80.
Christopher Kilby 《World development》2011,39(11):1981-1994
Over the last few years, considerable attention has focused on aid fragmentation, the proliferation of donors and projects in developing countries. Aid fragmentation has continued to increase despite international efforts to foster donor coordination. One possible implication of fragmentation is smaller aid projects, potentially with the result of more administrative work for overtaxed recipient governments per dollar of aid received.This paper makes use of AidData data on bilateral aid commitments, sector, and funding agencies to explore the determinants of project size and to better understand the forces driving aid fragmentation. To the extent that project size is driven by the sectoral composition or purpose of aid, the associated administrative costs may be justified. Variations due to other factors, e.g. a donor’s administrative structure or bureaucratic interests, provide a stronger case for reforms. 相似文献