The impact of an assessment of implicit support is a matter of judgement. The kind of information on which the MNE group would base a decision of whether or not to provide support to a borrower in particular circumstances may not be available to a tax administration, as is frequently the case in transfer pricing examinations, and the existence of information asymmetry may affect the ability of tax administrations to establish the likelihood of support (see section B.2 in Chapter IV). Furthermore, changing facts and circumstances affecting the willingness or ability of the MNE group to provide support may mean that there is no decision by the MNE group itself until the eventuality for such support arises. This contrasts, for example, where the MNE receives a formal guarantee from another group member. The past behaviour of an MNE group as regards providing support may be a useful indicator of likely future behaviour but an appropriate analysis should be undertaken to identify whether different conditions apply.