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Non-technical SummaryThe confidence that financial markets can substantially restrict the debt behaviour of governments is not high. One reason for the lack of market discipline could be that the European Central Bank (ECB) accepts all government bonds of the EU governments at the same conditions as eligible for monetary policy transactions. A differentiation with respect to potentially varying risk levels is not given. This could support the idea that government bond in the EU are equally secure and have the same low default risk.The use of government bonds as collateral in monetary policy transactions with the ECB has declined since 1999. Even if the ECB has not yet excluded securities from the list of eligible assets, this list contains an explicit enumeration of eligible assets. All bonds issued from governments of the EU are contained in the class with the lowest risk, despite large differences in debt and deficit. The acceptance of all government bonds at the same conditions is not followed by the markets, as the ratings of private rating agencies show.The rating of the central bank and the rating of the private agencies can be seen as two signals about the default risk of government bonds. Because the central bank and the rating agencies are expected to devote a considerable amount of resources to the assessment of the default risk of government bonds, we assume that the institutions identify the risk correctly on average. However, the assessed risk will not be correct in any case.The extent to which rating signals affect investors' expectations about the default risk of government bonds will then depend on the relationship between the evaluation error of the institutions. An effect of the ECB classification of a government bond on the risk premium can only arise theoretically if the error of the ECB is independent from that of the rating agency. In case of unbiased signals of the ECB and the agency, and the ECB signal depending on that of the rating agency, investors would ignore the signal of the ECB.If financial markets see the ECB as an independent source of information with regard to the default risk of government bonds, the classification as eligible assets for monetary policy transactions could influence the risk premia of bonds. In this case, it could be that the registration as eligible assets of all government bonds of the EU leads to more uniform risk premia than without this signal.
Market Discipline an...