Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Active margin system for margin loans using cash and stock as collateral
  and its application in Chinese market   Margin system for margin loans using cash and stock as collateral is
considered in this paper, which is the line of defence for brokers against risk
associated with margin trading. The conditional probability of negative return
is used as risk measure, and a recursive algorithm is proposed to realize this
measure under a Markov chain model. Optimal margin system is chosen from those
systems which satisfy the constraint of the risk measure. The resulted margin
system is able to adjust actively with respect to the changes of stock prices.
The margin system required by the Shanghai Stock Exchange is compared with the
proposed system, where 25,200 margin loans of 126 stocks listed on the SSE are
investigated. It is found that the number of margin calls under the proposed
margin system is significantly less than its counterpart under the required
system for the same level of risk, and the average costs of the loans are
similar under the two types of margin systems.

37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio