RATIONING DISCRETIONARY ECONOMIC RESOURCES: A MULTIOBJECTIVE APPROACH

Prior research involving capital rationing has focused on capital budgeting issues: given a limited resource pool, which major long-lived fixed assets should be acquired? However, capital rationing can be extended to include not only new fixed-asset purchases but also expenditures for any other discretionary activity such as advertising, research and development, or maintenance. In this broader situation, measuring the contributions of certain discretionary activities to a single objective (e.g., maximize profits) or to multiple objectives often is hindered by a lack of reliable revenue estimates. This problem severely hampers the usefulness of traditional mathematical programming approaches to capital rationing. In this paper, we modify the usual multiobjective capital rationing procedures by treating each discretionary activity as an objective in itself. In this manner, we can mitigate the difficulties associated with revenue measurement problems and allow a decision maker systematically to explore the various trade-offs between competing discretionary investments.     

The Bullwhip Effect—Impact of Stochastic Lead Time,Information Quality,and Information Sharing: A Simulation Study

We use a simulation model called ‘SISCO’ to examine the effects in supply chains of stochastic lead times and of information sharing and quality of that information in a periodic order‐up‐to level inventory system. We test the accuracy of the simulation by verifying the results in Chen et al. (2000a) and Dejonckheere et al. (2004). We find that lead‐time variability exacerbates variance amplification in a supply chain, and that information sharing and information quality are highly significant. For example, using the assumptions in Chen et al. (2000a) and Dejonckheere et al. (2004), we find in a numerical experiment of a customer‐retailer‐wholesaler‐distributor‐factory supply chain that variance amplification is attenuated by nearly 50 percent at the factory due to information sharing. Other assumptions we make are based on interviews or conversations with managers at large supply chains.     

Existence of approximate social welfare

This paper presents weak requirements on incomplete social preferences, and illustrates how such preferences can be derived from a choice rule. While the requirements do not guarantee the existence of a social welfare function, they do suffice for social preferences to be mapped faithfully to neighborhoods on the real line. That is, whenever consistent social choices are possible between given alternatives, the associated welfare intervals do not overlap.     

Census data on non-profit organisations

This paper describes how the Bureau of the Census collects and publishes data on non-profit organisations in its economic censuses programme. The paper provides a brief history of the economic censuses and describes in more detail the census of service industries component. The progressive expansion of the industry coverage of the census is explained and related to the non-profit sector. The paper further describes concepts and methodologies that are used in collecting and publishing data for non-profit organisations. Definitions, methods of enumeration, and basic data measures are explained and contrasted to concepts used in covering the for-profit sector. Finally, the paper describes how census data can be used to better understand the non-profit sector and identifies some possibilities for improving information from the economic censuses and other statistical programmes which cover non-profit organisations.     

Risk assessment of banknotes as a fomite of SARS-CoV-2 in cash payment transactions

The COVID 19 pandemic has triggered concerns and assumptions globally about transmission of the SARS-CoV-2 virus via cash transactions. This paper assesses the risk of contracting COVID-19 through exposure to SARS-CoV-2 via cash acting as a fomite in payment transactions. A quantitative microbial risk assessment was conducted for a scenario assuming an infectious person at the onset of symptoms, when virion concentrations in coughed droplets are at their highest. This person then contaminates a banknote by coughing on it and immediately hands it over to another person, who might then be infected by transferring the virions with a finger from the contaminated banknote to a facial mucous membrane. The scenario considered transfer efficiency of virions on the banknote to fingertips when droplets were still wet and after having dried up and subsequently being touched by finger printing or rubbing the object. Accounting for the likelihood of the scenario to occur by considering (1) a local prevalence of 100 COVID-19 cases/100,000 persons, (2) a maximum of about one-fifth of infected persons transmit high virus loads, and (3) the numbers of cash transactions/person/day, the risk of contracting COVID-19 via person-to-person cash transactions was estimated to be much lower than once per 39,000 days (107 years) for a single person. In the general populace, there will be a maximum of 2.6 expected cases/100,000 persons/day. The risk for a cashier at an average point of sale was estimated to be much less than once per 430 working days (21 months). The depicted scenario is a rare event, therefore, for a single person, the risk of contracting COVID-19 via person-to-person cash transactions is very low. At a point of sale, the risk to the cashier proportionally increases but it is still low.     

Child care subsidy and child maltreatment

This study examined the relationship between receipt of child care subsidies and child maltreatment investigations in a sample of low‐income mothers in Illinois. We expected that receiving child care subsidies would have a protective effect on child maltreatment risk and therefore decrease the likelihood of child protective services investigations. Using structural equation modelling, we tested the direct and indirect paths of the receipt of child care subsidies to physical abuse or neglect. We found only direct effects of receiving child care subsidies on both physical abuse and neglect investigations. The findings suggest an important protective role of child care subsidies in the lives of low‐income families.     

Assessing manual lifting tasks based on segment angle interpolations

This study investigates the effects of the number of interpolation points on the prediction accuracy of segment angle trajectory during lifting. Ten participants performed various lifting tasks while a motion tracking system recorded their movements. Two-point through ten-point equal time-spaced segment angles extracted from major segment trajectory data captured by the motion tracking system were used to re-generate the whole body lifting motion by using polynomial and cubic spline interpolation methods. The root mean square error (RMSE) between the reference (motion tracking system) and the estimated (interpolation method) segment angle trajectories were calculated to quantify the prediction accuracy. The results showed that the cubic spline interpolation will yield a smaller RMSE value than one based on the polynomial interpolation. While increasing the number of interpolation points can reduce the RMSE of the estimated segment angle trajectories, there was a diminishing advantage in continuing to add interpolation points. A sensitivity analysis suggests that if the estimation of the segment angles at each interpolation point deviates considerably from the real value, and cannot be controlled at a low level (<10 (), the use of higher number of interpolation points will not improve the estimation accuracy.     

Examination of computer task exposures in radiologists: a work systems approach

Radiologists are intensive computer users as they review and interpret radiological examinations using the Picture Archiving and Communication Systems (PACS). Since their computer tasks require the prolonged use of pointing devices, a high prevalence of Musculoskeletal Disorders (MSDs) is reported. The first phase of this study involved conducting a Cognitive Work Analysis in conjunction with a Participatory Ergonomics approach to perform a total work system analysis. We also conducted an ergonomic survey as well as collected computer use data, specifically for the mouse and keyboard. The goal of the study was to reduce the physical exposures for radiologists. This paper presents Phase I results describing the analyses and redesign process of the radiologists tasks, training design, computer use, and selected survey results.