Joined Cases C-125/07 P, C-133/07 P, C-135/07 P and C-137/07 P: Judgment of the Court (Second Chamber) of 24 September 2009 — Erste Group Bank AG, formerly Erste Bank der österreichischen Sparkassen AG (C-125/07 P), Raiffeisen Zentralbank Österreich AG (C-133/07 P), Bank Austria Creditanstalt AG (C-135/07 P), Österreichische Volksbanken AG (C-137/07 P) v Commission of the European Communities (Appeal — Agreements, decisions and concerted practices — Fixing by Austrian banks of credit and debit interest rates — Lombard Club — Effect on trade between Member States — Calculation of fines — Takeover of undertakings — Concrete impact on the market — Implementation of the cartel)