This volume contains a selection of contributions presented at the WEHIA02 (Workshop on Economies with Heterogeneous Interacting Agents), which was held at the Abdus Salam International Centre for Physics of Trieste, Italy, on May 29- 31, under the auspices of Exystence, Complex System network of excellence . WEHIA02 is the 7th edition of a workshop, which was held for the first time at the University of Ancona, Italy, on 1996 (1), as a one-week series of seminars for the Italian PhD program . Ancona hosted the event in the years 1997 and 1998 (2), before it moved to Genoa 1999 (3), Marseille...

When applying the statistical theory of long range dependent (LRD) processes to economics, the complexity of macroeconomic and financial variables, compared to standard LRD processes, becomes apparent. To gain an understanding of the behaviour of economic variables, this book assembles three strands of long memory analysis.