The rating is a method used to classify both the bonds that companies based on their risk.
It is expressed through a vote in letters, under which the market establishes a risk premium to require the company to accept that certain investment.
To reduce the rating, increases the risk premium demanded by investors, and then the issuer must pay a spread greater than the rate of return on a risk-free investment.
The ratings are published periodically by specialized agencies, which, such as Standard & Poor’s,Moody’s e Fitch.
Alex Gaetani