“…That is, the EMH, even in its weaker form (iv'), does not appear to hold in the case of the crude oil market. This result is not at odds with recent empirical evidence that underlines the ine¢ ciency of the futures crude oil market, see, for example, the discussions on this point in Narayan, Huson and Narayan (2012) and Westerlund and Narayan (2013). However, it is worth noting that these authors, using the more restrictive I(0)/I(1) paradigm, reject the hypothesis that the oil spread constitutes a co-integrated relationship.…”