166In the second place, as regards the legal tests which should be applied in order to determine whether Morgan Stanley was a potential competitor in the market in question, it follows from the case-law cited in paragraphs 68 and 69 above that the Commission was required to determine whether, if the Rule had not been applied to Morgan Stanley, there would have been real concrete possibilities for it to enter the United Kingdom acquiring market and to compete with established undertakings.
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