In response to questions posed by a Swedish court in the TeliaSonera case (C-52/09), Advocate-General Mazak gave his opinion on what constitutes an anti-competitive ‘margin squeeze’. In his opinion, a margin squeeze occurs where the difference between the retail prices charged by a dominant company and the wholesale prices it charges its competitors is insufficient to cover the cost to the dominant company of supplying its own retail products in the downstream market. This type of pricing conduct by a dominant company is an abuse where the wholesale product is indispensible in order to compete on the downstream market. However, the need to demonstrate ‘indispensability’ is unnecessary if the dominant company is under a regulatory obligation to supply the wholesale product.