In 2010, Republic Services, a waste management firm, issued 10-year notes and 30-year bonds.
According to an article in the Wall Street Journal, the 10-year notes had a risk premium of 1.40 percentage points over 10-year Treasury notes, while the 30-year bonds had a risk premium of 1.65 percentage points over 30-year Treasury bonds.
Why would the risk premium be higher on Republic Services's 30-year bonds than on its 10-year notes?