1. Member States shall ensure that neither the burden nor the standard of proof required for the quantification of harm renders the exercise of the right to damages practically impossible or excessively difficult. Member States shall ensure that the national courts are empowered, in accordance with national procedures, to estimate the amount of harm if it is established that a claimant suffered harm but it is practically impossible or excessively difficult precisely to quantify the harm suffered on the basis of the evidence available.

2. It shall be presumed that cartel infringements cause harm. The infringer shall have the right to rebut that presumption.

3. Member States shall ensure that, in proceedings relating to an action for damages, a national competition authority may, upon request of a national court, assist that national court with respect to the determination of the quantum of damages where that national competition authority considers such assistance to be appropriate.