MBS maturity premium

Question regarding end of chapter questions 3) a) in reading 14.

I understand why the 1% maturity premium is added to the corporate bond, but why is the maturity premium not added to the 10yr MBS as well?

Any help will be much appreciated.

read the fine print at the bottom of the question (under the table) …

Thanks CP… Can’t believe I missed that.

Spot on.