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Using US quarterly data (1967–2023), including inflation’s post-pandemic surge and decline alongside monetary policies characterized by quantitative easing before refocusing on the 2% target, we utilize traditional and novel econometric tools to assess the stability of key macroeconomic variables’ responses to monetary shocks. Our findings confirm the relevance of a broad Divisia aggregate in understanding monetary policy transmission and highlight its empirical importance in explaining output and price dynamics across decades. Time-varying impulse response functions (IRFs) reveal consistent and puzzle-free price responses to Divisia-based monetary shocks throughout the sample, aligning with theory. Time-varying IRFs indicate that pandemic-related outliers in GDP (2020Q2) do not disrupt results. In contrast, Fed Funds rate or shadow policy interest rate shocks often yield puzzling outcomes across earlier and extended periods.
This re-evaluation of the work of Karlheinz Stockhausen is presented as a dialogue between its authors, conducted by email between July and October 2024. The dialogue takes as its starting point a consideration of the continuing relevance of Stockhausen’s music to music today, but begins by tracing the authors’ engagement with this music over the last five decades. The dialogue moves on to the discussion of a series of key aspects of Stockhausen’s work across his creative life, from Kreuzspiel to KLANG: the relationship between his electronic music and his compositional practice for acoustic instruments; form-schemes in his music and, in particular, the development of moment form; and his use of synthesisers. In conclusion, the authors assess Stockhausen’s influence on their own work and the extent of his significance for younger generations of musicians.
We assess the proposition that intergroup conflict (IGC) in non-human primates offers a useful comparison for studies of human IGC and its links to parochial altruism and prosociality. That is, for non-linguistic animals, social network integration and maternal influence promote juvenile engagement in IGC and can serve as the initial grounding for sociocultural processes that drive human cooperation. Using longitudinal data from three cohorts of non-adult vervet monkeys (Chlorocebus pygerythrus), we show that non-adults are sensitive to personal (age) and situational risk (participant numbers). The frequency and intensity of participation, although modulated by rank and temperament, both mirrors maternal participation and reflects non-adult centrality in the grooming network. The possibility of social induction is corroborated by the distribution of grooming during IGC, with non-adults being more likely to be groomed if they were female, higher-ranking and participants themselves. Mothers were more likely to groom younger offspring participants of either sex, whereas other adults targeted higher-ranking female participants. Although we caution against a facile alignment of these outcomes to human culturally mediated induction, there is merit in considering how the embodied act of participation and the resultant social give-and-take might serve as the basis for a unified comparative investigation of prosociality.
Over the last several years, the study of implicit bias has taken the world by storm. Implicit bias was even mentioned by the then candidate, Hillary Clinton, in a presidential debate in 2016. She went on to claim that implicit bias can have deadly consequences when Black men encounter law enforcement (for example, see Correll et al., 2002; Correll et al., 2007; Eberhardt et al., 2004). The controversy over police shootings of Black men and women has only intensified as evidenced by public outcry over the murder of George Floyd on May 25, 2020 and increasing public support for the “Black Lives Matter” movement and its calls for liberty, justice, and freedom (Cohn & Quealy, 2020). These current events are but one reason why the study of implicit bias has so captivated the attention of the larger public: reducing it seems to have the potential to solve real-world problems. One idea is that if police officers were made aware of their implicit bias or participated in training workshops to reduce implicit bias, then perhaps fewer Black people would end up dead, arrested, or disproportionately sentenced to receive the death penalty (Baumgartner et al., 2014; Eberhardt, 2020).
This Element outlines the origins and evolution of an international award-winning development intervention, index-based livestock insurance (IBLI), which scaled from a small pilot project in Kenya to a design that underpins drought risk management products and policies across Africa. General insights are provided on i) the economics of poverty, risk management, and drylands development; ii) the evolving use of modern remote sensing and data science tools in development; iii) the science of scaling; and iv) the value and challenges of integrating research with operational implementation to tackle development and humanitarian challenges in some of the world's poorest regions. This title is also available as Open Access on Cambridge Core.
To analyze Clostridioides difficile testing in 3 hospitals in central North Carolina to validate previous racial health-disparity findings.
Methods:
We completed a retrospective analysis of inpatient C. difficile tests from 2015 to 2021 at 3 university-affiliated hospitals in North Carolina. We calculated the number of C. difficile tests per 1,000 patient days stratified by race: White, Black, and non-White, non-Black (NWNB). We defined a unique C. difficile test as one that occurred in an inpatient unit with a matching laboratory accession ID and on differing calendar days. Tests were evaluated overall, by hospital, by year, and by positivity rate.
Results:
In total, 35,160 C. difficile tests and 2,571,850 patient days across all 3 hospitals from 2015 to 2021 were analyzed. The median number of C. difficile tests per 1,000 patient days was 13.85 (interquartile range [IQR], 9.88–16.07). Among all C. difficile tests, 5,225 (15%) were positive. White patients were administered more C. difficile tests (14.46 per 1,000 patient days) than Black patients (12.96; P < .0001) or NWNB race patients (10.27; P < .0001). Black patients were administered more tests than NWNB patients (P < .0001). White patients tested positive at a similar rate to Black patients (15% vs 15%; P = .3655) and higher than NWNB individuals (12%; P = .0061), and Black patients tested positive at a higher rate than NWNB patients (P = .0024).
Conclusion:
White patients received more C. difficile tests than Black and NWNB patient groups when controlling for race patient days. Future studies should control for comorbidities and investigate community onset of C. difficile by race and ethnicity.
We assessed Oxivir Tb wipe disinfectant residue in a controlled laboratory setting to evaluate low environmental contamination of SARS-CoV-2. Frequency of viral RNA detection was not statistically different between intervention and control arms on day 3 (P=0.14). Environmental contamination viability is low; residual disinfectant did not significantly contribute to low contamination.
Selective laser sintering methods are workhorses for additively manufacturing polymer-based components. The ease of rapid prototyping also means it is easy to produce illicit components. It is necessary to have a data-calibrated in-situ physical model of the build process in order to predict expected and defective microstructure characteristics that inform component provenance. Toward this end, sintering models are calibrated and characteristics such as component defects are explored. This is accomplished by assimilating multiple data streams, imaging analysis, and computational model predictions in an adaptive Bayesian parameter estimation algorithm. From these data sources, along with a phase-field model, bulk porosity distributions are inferred. Model parameters are constrained to physically-relevant search directions by sensitivity analysis, and then matched to predictions using adaptive sampling. Using this feedback loop, data-constrained estimates of sintering model parameters along with uncertainty bounds are obtained.
We present the current status of a scalable computing framework to address the need of the multidisciplinary effort to study chemical dynamics. Specifically, we are enabling scientists to process and store experimental data, run large-scale computationally expensive high-fidelity physical simulations, and analyze these results using state-of-the-art data analytics, machine learning, and uncertainty quantification methods using heterogeneous computing resources. We present the results of this framework on a single metadata-driven workflow to accelerate an additive manufacturing use-case.
The pre-last glacial maximum paleolake sediments at Baumkirchen, western Austria, are well known in Alpine Quaternary stratigraphy as being the type locality of the Middle to Upper Würmian transition. Their location provides a rare opportunity to investigate the vegetation history of the interior of the Alps during the last glacial cycle. A recent renewed research effort involving new drilling revealed a 250-m-thick lacustrine sequence with an older, ca. Marine Oxygen Isotope Stage (MIS) 4 phase and a younger, mid- to late MIS 3 phase. Pollen analysis reveals generally poor preservation and very low pollen concentration due to very high sedimentation rates. On the basis of pollen percentages and influx rates, six pollen zones (PZ) were assigned. PZ1 and 2 correspond to the entire ca. MIS 4 section and are characterized by only scattered vegetation representing an extremely cold and dry climate. Two stadials and two interstadials were identified in the MIS 3 section. The interstadials are characterized by well-developed open vegetation with some stands of trees, with the upper PZ6 being better developed but still forest-free. On the basis of previous radiocarbon dating, this zone (PZ6) is correlated to Greenland Interstadial (GI) 7 and the lower interstadial (PZ4) tentatively to GI 8.
By
Christopher B. Barrett, Stephen B. and Janice G. Ashley Professor of Applied Economics, Charles H. Dyson School of Applied Economics and Management, and Professor, Department of Economics, Cornell University, New York, USA
Post-2015 Consensus: Food Security and Nutrition Perspective
Summary
By 2050, there will be far more people to feed, increasingly distant from the rural areas where food is produced, and with the vast majority of the increased demand coming from Africa and Asia. In a world where currently up to 900 million people are chronically malnourished, reducing postharvest losses could play a significant role in meeting the coming challenge.
Rosegrant et al. make the most serious attempt to date to come to a reasonably rigorous answer to the question of the role that lower PHL might play. It is particularly useful that they have compared the effectiveness of reducing losses with the impact of increased spending on agricultural R&D. In the end, they project that both infrastructure investment to reduce PHL and agricultural R&D investment would significantly improve food security, especially in South Asia and sub-Saharan Africa, the regions of greatest global concern. Their conclusion is very sensible: PHL reduction can contribute to improvements in food security globally, but it is relatively less important and less cost-effective an approach than alternative policy instruments available to policymakers.
For a variety of reasons, I suspect that the authors’ estimates even err in the direction of exaggerating the role that PHL reduction can play. Their simulations only consider the food security impacts of infrastructure improvements that reduce PHL and ignore the simultaneous impact due to lower prices and uptake of improved production technologies by farmers who have better access to markets. As an aside, one very noteworthy result of the study is that infrastructure investment in Africa gives a much higher return than in Asia or Latin America. The second reason why the attractiveness of PHL reduction may be exaggerated is that there is no comparison with other potentially high-return interventions.
Another issue is that targeting reductions in food waste is difficult because losses appear for different reasons in different parts of the chain. PHL rates are endogenous to food prices and to incomes and in ways that will naturally make PHL increase as food security improves. Lower food prices improve poor people's access to food. But lower food prices also reduce the opportunity cost of food waste; poverty, not PHL, is the principal driver of food insecurity.
Since 1975 Richard had been based in Australia, where he taught at the Sydney Conservatorium, but he was born in England, in Chichester, and studied at Hull University. In the late 60s and early 70s he was active as a contemporary music pianist and in the mid-70s became part of the Cologne music scene, working as Stockhausen's Teaching Assistant at the Cologne Staatliche Musikhochschule from 1973 until his move to Australia. But his most significant contribution to new music was as a writer. His 1999 book on the life and work of Ligeti is a superb introduction to the composer's work, and in 2005 it was followed by his book of lectures on Stockhausen, Six Lectures from the Stockhausen Courses Kürten 2002; he also co-edited the collected writings of Ferneyhough with James Boros.
We agree with Lake and colleagues on their list of “key ingredients” for building human-like intelligence, including the idea that model-based reasoning is essential. However, we favor an approach that centers on one additional ingredient: autonomy. In particular, we aim toward agents that can both build and exploit their own internal models, with minimal human hand engineering. We believe an approach centered on autonomous learning has the greatest chance of success as we scale toward real-world complexity, tackling domains for which ready-made formal models are not available. Here, we survey several important examples of the progress that has been made toward building autonomous agents with human-like abilities, and highlight some outstanding challenges.
Three conjoint models—a traditional ratings model, a ratings difference specification, and a binary response model—were used to value groundwater protection program alternatives. The last, which is virtually identical to a dichotomous choice contingent valuation specification, produced the smallest value estimates. This suggests that the conjoint model is very sensitive to model specification and that traditional conjoint models may overestimate economic value because many respondents are not in the market for the commodity being valued.
The effective design and implementation of interventions that reduce vulnerability and poverty require a solid understanding of underlying poverty dynamics and associated behavioral responses. Stochastic and dynamic benefit streams can make it difficult for the poor to learn the value of such interventions to them. We explore how dynamic field experiments can help (i) intended beneficiaries to learn and understand these complicated benefit streams, and (ii) researchers to better understand how the poor respond to risk when faced with nonlinear welfare dynamics. We discuss and analyze dynamic risk valuation experiments in Morocco, Peru, and Kenya.
We examine the determinants of agricultural experiment station faculty salaries and find that productivity pays—as manifest by grantsmanship, publications, and the elicitation of competing offers—with no residual evidence of a negative seniority-salary relationship that could signal university monopsony power. This contrasts with findings in the previous literature on faculty salaries. Moreover, national market salary benchmarks, which may proxy for imperfectly observable productivity, correlate almost one-for-one with individual faculty salaries, with individual deviations from peers’ salaries proving essentially random. This evidence is much more consistent with the hypothesis that experiment station faculty salaries are determined in a competitive labor market than with the prevailing wisdom that they are set monopsonistically.