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In this paper, we consider trading with proportional transaction costs as in Schachermayer’s paper (Schachermayer in Math.
Finance 14:19–48, 2004). We give a necessary and sufficient condition for
, the cone of claims attainable from zero endowment, to be closed. Then we show how to define a revised set of trading prices
in such a way that, firstly, the corresponding cone of claims attainable for zero endowment,
, does obey the fundamental theorem of asset pricing and, secondly, if
is arbitrage-free then it is the closure of
. We then conclude by showing how to represent claims.
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