1. Member States shall ensure that national administrative competition authorities may by decision impose effective, proportionate and dissuasive periodic penalty payments on undertakings and associations of undertakings. Such periodic penalty payments shall be determined in proportion to the average daily total worldwide turnover of such undertakings or associations of undertakings in the preceding business year per day and calculated from the date appointed by that decision in order to compel those undertakings or associations of undertakings at least:
(a) to supply complete and correct information in response to a request referred to in Article 8,
(b) to appear at an interview referred to in Article 9.
2. Member States shall ensure that national competition authorities may by decision impose effective, proportionate and dissuasive periodic penalty payments on undertakings and associations of undertakings. Such periodic penalty payments shall be determined in proportion to the averag
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