Price gap anomaly in the US stock market : the whole story

dc.contributor.authorPlastun, Alex
dc.contributor.authorSibande, Xolani
dc.contributor.authorGupta, Rangan
dc.contributor.authorWohar, Mark E.
dc.contributor.emailrangan.gupta@up.ac.zaen_ZA
dc.date.accessioned2021-02-09T15:09:49Z
dc.date.issued2020-04
dc.description.abstractThis paper analyses the price gap anomaly in the US stock market (comprised of the DJI, S&P 500 and NASDAQ) covering the period 1928 to 2018. This paper aims to investigate whether or not price gaps create market inefficiencies. Price gaps occur when the current day’s opening price is different from the previous day’s closing price due orders placed before the opening of the market. Several hypotheses are tested using various statistical tests (Student’s t-test, ANOVA, Mann-Whitney test), regression analysis, and special methods, that is, the modified cumulative returns and the trading simulation approaches. We find strong evidence in favour of abnormal price movements after price gaps. We observe that during a gap day prices tend to change in the direction of the gap. A trading strategy based on this anomaly was efficient in that its results were not random, indicating that this market was not efficient. The momentum effect was found to be temporary and no evidence of seasonality in price gaps was found. Lastly, our results were also contrary to the myth that price gaps tend to get filled.en_ZA
dc.description.departmentEconomicsen_ZA
dc.description.embargo2021-04-01
dc.description.librarianhj2021en_ZA
dc.description.urihttps://www.elsevier.com/locate/najefen_ZA
dc.identifier.citationPlastun, A., Sibande, X., Gupta, R. et al. 2020, 'Price gap anomaly in the US stock market: the whole story', The North American Journal of Economics and Finance, vol. 52, art. 101177, pp. 1-17.en_ZA
dc.identifier.issn1062-9408 (print)
dc.identifier.issn1879-0860 (online)
dc.identifier.other10.1016/j.najef.2020.101177
dc.identifier.urihttp://hdl.handle.net/2263/78336
dc.language.isoenen_ZA
dc.publisherElsevieren_ZA
dc.rights© 2020 Elsevier Inc. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in North American Journal of Economics and Finance. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in North American Journal of Economics and Finance, vol. 52, art. 101177, pp. 1-17, 2020. doi : 10.1016/j.najef.2020.101177.en_ZA
dc.subjectPrice gap anomalyen_ZA
dc.subjectTrading strategyen_ZA
dc.subjectStock marketen_ZA
dc.subjectMomentum effecten_ZA
dc.subjectEfficient market hypothesisen_ZA
dc.titlePrice gap anomaly in the US stock market : the whole storyen_ZA
dc.typePostprint Articleen_ZA

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