This panic was also aggravated because of the inability of the ECB to react and intervene on sovereign bonds markets for two reasons. First, because the ECB's legal framework normally forbids the purchase of sovereign bonds (Article 123. TFEU), This prevented the ECB from implementing quantitative easing like the Federal Reserve and the Bank of England did as soon as 2008, which played an important role in stabilizing markets. Secondly, a decision by the ECB made in 2005 introduced a minimum credit rating (BBB-) for all Eurozone sovereign bonds to be eligible as collateral to the ECB's open market operations. This meant that if a private rating agencies were to downgrade a sovereign bond below that threshold, many banks would suddenly become illiquid because they would lose access to ECB refinancing operations. According to former member of the governing council of the ECB Athanasios Orphanides, this change in the ECB's collateral framework "planted the seed" of the euro crisis.