Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Blindfolded monkeys or financial analysts: who is worth your money? New
  evidence on informational inefficiencies in the U.S. stock market   The efficient market hypothesis has been considered one of the most
controversial arguments in finance, with the academia divided between who
claims the impossibility of beating the market and who believes that it is
possible to gain over the average profits. If the hypothesis holds, it means,
as suggested by Burton Malkiel, that a blindfolded monkey selecting stocks by
throwing darts at a newspaper's financial pages could perform as well as a
financial analyst, or even better. In this paper we use a novel approach, based
on confidence intervals for proportions, to assess the degree of inefficiency
in the S&P 500 Index components concluding that several stocks are inefficient:
we estimated the proportion of inefficient stocks in the index to be between
12.13% and 27.87%. This supports other studies proving that a financial
analyst, probably, is a better investor than a blindfolded monkey.

18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con