Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modelling Migration and Economic Agglomeration with Active Brownian
  Particles   We propose a stochastic dynamic model of migration and economic aggregation
in a system of employed (immobile) and unemployed (mobile) agents which respond
to local wage gradients. Dependent on the local economic situation, described
by a production function which includes cooperative effects, employed agents
can become unemployed and vice versa. The spatio-temporal distribution of
employed and unemployed agents is investigated both analytically and by means
of stochastic computer simulations. We find the establishment of distinct
economic centers out of a random initial distribution. The evolution of these
centers occurs in two different stages: (i) small economic centers are formed
based on the positive feedback of mutual stimulation/cooperation among the
agents, (ii) some of the small centers grow at the expense of others, which
finally leads to the concentration of the labor force in different extended
economic regions. This crossover to large-scale production is accompanied by an
increase in the unemployment rate. We observe a stable coexistence between
these regions, although they exist in an internal quasistationary
non-equilibrium state and still follow a stochastic eigendynamics.

35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg