Rating agencies state that they take a rating action only when it is unlikely to be reversed shortly afterwards. Based on a formal representation of the rating process, I show that such a policy provides a good explanation for the empirical evidence: Rating changes occur relatively seldom,...

On November 14th, 2014, SUERF – The European Money and Finance Forum – and CNMV, Comisión Nacional del Mercado de Valores – the Spanish Authority for supervision of securities markets – jointly organized a conference in Madrid: Challenges in Securities Markets Regulation: Investor...