Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamics of price and trading volume in a spin model of stock markets
  with heterogeneous agents   The dynamics of a stock market with heterogeneous agents is discussed in the
framework of a recently proposed spin model for the emergence of bubbles and
crashes. We relate the log returns of stock prices to magnetization in the
model and find that it is closely related to trading volume as observed in real
markets. The cumulative distribution of log returns exhibits scaling with
exponents steeper than 2 and scaling is observed in the distribution of
transition times between bull and bear markets.

22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph