Bouri, ElieChang, TsangyaoGupta, Rangan2018-02-152018-02-152017-06-15Bouri, E., Chang, T. & Gupta, R. 2017, 'Testing the efficiency of the wine market using unit root tests with sharp and smooth breaks', Wine Economics and Policy, vol. 6, pp. 80-87.2212-9774 (online)10.1016/j.wep.2017.06.001http://hdl.handle.net/2263/63985This paper examines the efficient market hypothesis for the wine market using a novel unit root test while accounting for sharp shifts and smooth breaks in the monthly data. We find evidence of structural shifts and nonlinearity in the wine indices. Contrary to the results from conventional linear unit root tests, when we account for sharp shifts and smooth breaks, the unit root null for each of the wine indices has been rejected. Overall, our results suggest that the wine market is inefficient when we incorporate breaks. We provide some practical and policy implications of our findings.en© 2017 UniCeSV, University of Florence. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).Wine marketEfficiencySharp and smooth breaksUnit root testsArticle