2022
DOI: 10.1137/20m1375826
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Insiders and Their Free Lunches: The Role of Short Positions

Abstract: Given a stock price process, we analyse the potential of arbitrage by insiders in a context of short-selling prohibitions. We introduce the notion of minimal supermartingale measure, and we analyse its properties in connection to the minimal martingale measure. In particular, we establish conditions when both fail to exist. These correspond to the case when the insider's information set includes some non null events that are perceived as having null probabilities by the uninformed market investors. These resul… Show more

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Cited by 2 publications
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“…So far, the literature seems not to have clarified precisely the crucial link between short selling and exploiting arbitrage. Although there are papers dealing with financial markets under short sale constraints (see, for example [16,23,28,12,14,2,1]),…”
mentioning
confidence: 99%
“…So far, the literature seems not to have clarified precisely the crucial link between short selling and exploiting arbitrage. Although there are papers dealing with financial markets under short sale constraints (see, for example [16,23,28,12,14,2,1]),…”
mentioning
confidence: 99%