Drawing on two assumptions: that menopause is an instrument for the efficient regulation of duration a biologically expensive state, and people have children in order to obtain support from them old age, we set out new idea seeks explain both occurrence its timing. On basis notion purpose having perceive as upper limit fertile when continued ability give birth would not generate desired support...

We study the geographic distribution of military supply contracts during World War II. This is a unique case, since over $3 trillion current day dollars was spent, and there were concerns that the country’s future hinged on the war outcome. We find robust evidence consistent with the hypothesis that economic factors dominated the allocation of supply contracts, and that political factors—or at ...

This paper is devoted to the analysis of the General Practitioners’ (GPs) labour supply, specifically focusing on the physicians’ labour supply responses to higher compensations. This analysis is mainly aimed at challenging the reality of a ‘backward bending’ form for the labour supply of GPs. Because GPs’ fees only evolve very slowly and are mainly fixed by the National Health Ins...

Nitrogen (N) immobilisation by heterotrophic microorganisms is critical for reducing N losses from soils and ensuring a long-term supply of to plants in grassland ecosystems. The carbon (C) available soil microbes may stimulate the availability ammonium autotrophic nitrifiers and, hence, nitrification activity. main source C rhizodeposition, but its effects on activity remain unclear as rhizode...

................................................................................................................................ ii ACKNOWLEDGEMENTS ........................................................................................................ iv TABLE OF CONTENTS ............................................................................................................. v LIST OF TA...