Maternal employment and childhood obesity in China: evidence from the China Health and Nutrition Survey

Using five waves from the China Health and Nutrition Survey (CHNS), we investigate the association between maternal employment and obesity in children aged 3–17 in both rural and urban China. Using body mass index (BMI) and waist circumference (WC) as measures for paediatric adiposity, we provide scant evidence for its relation to maternal employment. We also find no strong association between maternal employment and our measures for children’s diet and physical activity. Our study also suggests that grand-parenting could have beneficial effects on childhood obesity.     

Ownership Structure, Technological Endowment and Competitive Advantage: Do Democracy and Business Fit?

The current study provides a model that aims to explain the origin of the competitive advantage of organizations in terms of the ownership structure. We have also studied the interactions between IT use and ownership structure. To reach these objectives, we have classified the organizations in two groups using the cooperative character criterion. The results show that cooperative firms achieve a superior competitive advantage regardless of the amount of IT that the firms use. The study is focused on the Spanish Pharmaceutical Distribution Industry.     

A statistical analysis of seven multipliers for linear congruential random number generators with modulus 231−1

Twelve statistical tests were performed on the sequences produced by seven linear congruential pseudorandom number generators with modulus 2³¹?1. The seven generators had, respectively, the multipliers 742938285, 950706376, 1226874159, 62089911, 1343714438, 397204094 and 16807. The worst results were obtained from the sequences produced by the multipliers 1226874159, 397204094 and 16807, while the best ones corresponded to the sequences produced by 1343714438 and 742938285.     

Challenges for forest conservation in Gabon, Central Africa

In recent decades, large expanses of tropical rainforest in central and western Africa have been cleared, logged, fragmented, and overhunted. In contrast, extensive forest in Gabon has survived in a relatively intact condition because the country has a sparse population and substantial petroleum and mineral deposits that have reduced economic pressures on forests. Unfortunately, Gabon's petroleum reserves are dwindling. As a direct result, industrial logging is expanding rapidly; nearly half of the country's forest is currently in timber leases, and this could increase to over 75% of the remaining forest during the next decade. Mechanized logging has important ecological impacts on forests, but the most severe effects are indirect, because loggers create labyrinths of roads that greatly increase access to forests for hunters and slash-and-burn farmers. Declines of forest wildlife from overhunting have been severe in much of tropical Africa, and are likely to rise sharply in Gabon as physical accessibility to forests increases.The Gabonese government is eager to consider alternative strategies to augment economic development, including promotion of an ecotourism industry. This commitment is evidenced by the government's recent designation of 13 new national parks that comprise over a tenth of the country's land area. Efforts to develop ecotourism face substantial challenges, however, including the high profitability of exploitative land uses like logging, the illegal encroachment of loggers and hunters into nature reserves, political instability in the surrounding region, and limited infrastructure for tourism. Nevertheless, these and other efforts to promote more-sustainable development should be strongly supported, as Gabonese forests have among the highest levels of species diversity and endemism in tropical Africa and are likely to play a critical future role in biodiversity conservation.     

'Successes' and 'Failures' in the Markets for Technology

Market-mediated contracts for technology trade are bound byseveral transaction costs. This paper argues that as these transactioncosts become less severe, markets for technology can help improvethree market failures: (i) R&D duplications; (ii) externalitiesin potentially public R&D outcomes; and (iii) deviationsfrom marginal cost pricing in the downstream product markets.In addition, with larger markets of potential users, the technologysuppliers will have incentives to produce more ‘general’technologies which span a wider number of firms or industries.Markets for technology also produce new failures. In particular,they induce deviation from marginal cost pricing in the saleof the technology, and they generate externalities associatedwith complementary R&D and other investments made by theindependent buyers and suppliers that operate in them. The paperconcludes by discussing policy implications.