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Bid–ask matrix : ウィキペディア英語版
Bid–ask matrix

The bid–ask matrix is a matrix with elements corresponding with exchange rates between the assets. These rates are in ''physical units'' (e.g. number of stocks) and not with respect to any ''numeraire''. The (i,j) element of the matrix is the number of units of asset i which can be exchanged for 1 unit of asset j.
==Mathematical Definition==
A d \times d matrix \Pi = \left()_ is a ''bid-ask matrix'', if
# \pi_ > 0 for 1 \leq i,j \leq d. Any trade has a positive exchange rate.
# \pi_ = 1 for 1 \leq i \leq d. Can always trade 1 unit with itself.
# \pi_ \leq \pi_\pi_ for 1 \leq i,j,k \leq d. A direct exchange is always at most as expensive as a chain of exchanges.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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