The Fixing of Interest Rates and the Rigging of particular country's Credit Ratings follow bazaar patterns of behaviour from the Banking fraternity...assynchronous to begin with as if a prompt is required before the others follow suite!
Who decides and what are those precise factors which determine an Increase in the Interest Rate or the downgrade alteration of the Credit Rating.
Who drives Moody's or Fitch, or the other Ratings Agencies...there is an answer to this question, the same way there is an answer to the Fixing of the Libor Rate!
Something Rotten with Modern-Banking! right! It has become too political!