The growth of business services and the economic cycle

Business services have become one of the most dynamic activities in modern economies. Their high growth rates in value added and employment support its outstanding position. The paper identifies short-term cyclical and long-term structural components in the business services growth. The relationship between business services and the economic cycle and the wide spectrum of reasons explaining structural growth are also analysed. The conclusions point out the importance of business services for economic progress of current economies. It seems that the structural component is more relevant than the cyclical one. The available data for some main OECD countries show that there is still a potential margin for further structural growth for business services. Some policies implications can be drawn from all this.

Internationalisation of services

Main ways to internationalisation: international trade of services and crossed direct investmen

Discovery of kilogauss magnetic fields in three DA white dwarfs

We have detected longitudinal magnetic fields between 2 and 4 kG in three (WD 0446$-$790, WD 1105$-$048, WD 2359$-$434) out of a sample of 12 normal DA white dwarfs by using optical spectropolarimetry done with the VLT Antu 8 m telescope equipped with FORS1. With the exception of 40 Eri B (4 kG) these are the first positive detections of magnetic fields in white dwarfs below 30 kG. Although suspected, it was not clear whether a significant fraction of white dwarfs contain magnetic fields at this level. These fields may be explained as fossil relics from magnetic fields in the main-sequence progenitors considerably enhanced by magnetic flux conservation during the shrinkage of the core. A detection rate of 25 % (3/12) may indicate now for the first time that a substantial fraction of white dwarfs have a weak magnetic field. This result, if confirmed by future observations, would form a cornerstone for our understanding on the evolution of stellar magnetic fields. Keywords: stars: white dwarfs - stars: magnetic fields - stars: individual: WD0446-790, WD1105-048, WD2359-434Comment: 15 pages, 7 figures, Astronomy and Astrophysics, in pres