191In particular, as regards a pricing practice which causes a margin squeeze, the use of such analytical criteria can establish whether that undertaking would have been sufficiently efficient to offer its retail services to end-users otherwise than at a loss if it had first been obliged to pay its own wholesale prices for the intermediary services (Deutsche Telekom v Commission, paragraph 170 above, paragraph 201, and TeliaSonera, paragraph 146 above, paragraph 42).
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