Invariances and Diversities in the Evolution of Manufacturing Industries

In this work we explore some basic properties of the size distributions of firms and
of their growth processes both at aggregate and disaggregate levels. First, we
investigate which properties of firm’s size distributions and growth dynamics are
robust under disaggregation. Second, at a disaggregate level, we try to identify
those features which are generic and hold across all or most of the considered
three digit sectors distinguishing them from sector-specific ones. Concerning firm
growth, we mainly focus on the characterization of the distribution of growth rates,
studying, again, the possible differences between sectors and between levels of
aggregation. Finally, we begin to explore the relations between measures of size
distributions and the nature of the underlying growth processes and discuss some
admittedly unresolved puzzles.