We investigate the daily correlation present among market indices of stock exchanges located all over the world in the time period Jan 1996 - Jul 2009. We discover that the correlation among market indices presents both a fast and a slow dynamics. The slow dynamics reflects the development and...

Two hypotheses concerning the acquisition of network graph structures were tested. Strong support was found for the hypothesis that the deep structure of a graph affects how quickly it will be learned. Specifically, scale-free graphs were acquired more readily than random graphs. Much less...

The determination of the $/£ exchange rate is studied in a small symmetric macroeconometric model including UK-US differentials in inflation, output gap, short and long-term interest rates for the four decades since the breakdown of Bretton Woods. The key question addressed is the possible...