Case T-396/10: Judgment of the General Court of 16 September 2013 — Zucchetti Rubinetteria v Commission (Competition — Agreements, decisions and concerted practices — Bathroom fittings and fixtures markets of Belgium, Germany, France, Italy, the Netherlands and Austria — Decision finding an infringement of Article 101 TFEU and Article 53 of the EEA Agreement — Coordination of price increases and exchange of sensitive business information — Concept of infringement — Single infringement — Relevant market — 2006 Guidelines on the method of setting fines — Gravity — Multipliers)