Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Power law for ensembles of stock prices   In this paper we quantitatively investigate the statistical properties of an
ensemble of {\it stock prices}. We selected 1200 stocks traded in the Tokyo
Stock Exchange and formed a statistical ensemble of daily stock prices for each
trading day in the 5 year period from January 4, 1988 to December 30, 1992. We
found that the tail of the complementary cumulative distribution function of
the ensembles is accurately described by a power-law distribution with an
exponent that moves in the range of $ 1.7 < \alpha < 2.2 $.

10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas