sir what ive read in kaplan book and other notes that macaulay duration is a investment appraisal technique but in your notes its related to bond valuation and time taken for it to return interest, i also could not get what gross redemption yield is and the calculation in example 4 chapter 8? is it basically cash flow generated by the bond, i couldnt find a lecture on chapter 8 also relating to bond valuation etc 🙁