The relationship between employment and mental and physical health in South Africa

This paper estimated the relationship between employment and depression, hypertension, diabetes and tuberculosis in South Africa between 2008 and 2014. South Africa has high levels of economic inactivity and unemployment as well as a high disease burden occasioned by depression, other non-communicable diseases and tuberculosis. Data came from the National Income Dynamics Study panel dataset. Using fixed effects, random effects and pooled ordinary least squares regressions, depression and diabetes were associated with a 4–6 percentage point decline in employment probability, while tuberculosis was associated with a 12–13 percentage point employment decline. The results suggested that the employment-health relationship possibly operated through illness being associated with increased economic inactivity, rather than through making the search efforts of the unemployed unsuccessful. Moreover, the employment-health relationship not only existed contemporaneously, but extended into the future (especially for the physical health indicators).     

A comparison of Ad valorem and per unit taxes in regulated monopolies

This paper compares the output and revenue effects in the rate-of-return regulated monopoly model. Both the ad valorem and the unit tax generally decrease the use of capital, and as such, reduce the output and raise the price. In addition, it is shown that Suits and Musgrave's conclusion of higher revenue of an ad valorem tax at a given output can apply to a regulated monopolist if the marginal product of labor under the ad valorem tax is greater than or equal to that under the unit tax. Similarly, their second conclusion, that for a given tax revenue an ad valorem tax has a larger output than a unit tax rate before the revenue-maximizing tax rate, can also apply to the regulated monopolist.     

DEFINING AND OPERATIONALIZING SUPPLY CHAIN PROCESS INTEGRATION

Integration has been recognized as critical to successful supply chain management. However, an extensive literature review revealed no consensus in its conceptualization. The current study attempts to address this research gap by providing a better definition and operationalization of supply chain process integration. With empirical support, it is proposed that internal and external supply chain process integration should be treated as two separate constructs, each comprised of two dimensions: connectivity and simplification.     

Finance and growth in Africa: The broken link

While bank liabilities in Sub-Saharan Africa are found to follow (but not lead) economic growth, the link between bank credit and growth is altogether absent.     

On structural inelasticity of modal substitution in freight transport

At the European level there is an increasing focus on how freight transport can be moved from trucks on roads to more environmentally friendly modes such as rail and ship. A large proportion of the transport services between OD pairs, however, cannot be substituted since there is only one alternative available. The paper investigates the magnitude of this “structural inelasticity” of modal substitution in freight transport due to a sparser layout of rail and ship-based freight networks compared to road. In the analysis we use a recent Scandinavian freight demand model covering more than 800 zones. We find that the structural inelasticity is very significant - in particular for transportation over less than 500 km. Moreover, the inelasticity varies greatly with commodity groups and between OD pairs, and it depends strongly on the port and rail infrastructure. The results suggest that pure charging instruments (road pricing for trucks) in many regions will have limited mode substitution impacts. However, if combined with structural changes in terms of improved infrastructure for rail and ship, impacts may be greater.     

Estimating the impact of showroom entertainment on the gaming volumes of Las Vegas hotel–casinos

Increases in showroom headcounts are found to increase casino gaming volumes in two Las Vegas Strip casinos. This study examines long-standing assumptions regarding the indirect contribution of investment-intensive showroom entertainment. Such contributions are difficult to measure and the literature contains no rigorously derived estimates of gaming contributions from in-house entertainment venues. Despite the paucity of research, gaming companies are willing to invest staggering sums in showroom entertainment, based in large part on the belief that traffic from these venues will increase gaming volumes. Using estimates produced by time series regression models, the two showrooms produced average gaming win contributions of $11.28 and $19.32, per paid showroom attendee. Based on these estimates alone, extravagant investment in showrooms would have to be justified by other means. Future studies aimed at understanding the showroom contributions to non-gaming profit centers and the role of showrooms in the high-roller's patronage decision are both recommended.     

Is There Persistence in the Impact of Emergency Food Aid? Evidence on Consumption, Food Security, and Assets in Rural Ethiopia

We identify the impact of emergency food aid programs after the 2002 drought in rural Ethiopia on future welfare. Based on a difference-in-differences matching estimator, participation in food-for-work increases growth in total consumption and food consumption eighteen months after the drought. Separately, receiving free food raises growth in food consumption, but, surprisingly, negatively impacts food security. Food-for-work benefited households in the middle and upper tail of the consumption distribution, while the better-targeted free food program benefited the poorest. Evidence suggests these impacts demonstrate accumulated and persistent effects of food aid received in the first twelve months after the drought.