Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The different structure of economic ecosystems at the scales of
  companies and countries   A key element to understand complex systems is the relationship between the
spatial scale of investigation and the structure of the interrelation among its
elements. When it comes to economic systems, it is now well-known that the
country-product bipartite network exhibits a nested structure, which is the
foundation of different algorithms that have been used to scientifically
investigate countries' development and forecast national economic growth.
Changing the subject from countries to companies, a significantly different
scenario emerges. Through the analysis of a unique dataset of Italian firms'
exports and a worldwide dataset comprising countries' exports, here we find
that, while a globally nested structure is observed at the country level, a
local, in-block nested structure emerges at the level of firms. Remarkably,
this in-block nestedness is statistically significant with respect to suitable
null models and the algorithmic partitions of products into blocks have a high
correspondence with exogenous product classifications. These findings lay a
solid foundation for developing a scientific approach based on the physics of
complex systems to the analysis of companies, which has been lacking until now.

24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol