duration question- topic test derivatives Allison

CFA Level III
#1

can anyone help to explain the difference between the implied modified duration of Treasury bond futures contracts and Macaulay duration of Treasury bond futures contracts?

I think it’s always Macaulay Duration but the case used implied modified duration. Why?

#2

We studied that in L1, didnt we?

I cant exactly remember the difference, but heres the link.

http://www.investopedia.com/ask/answers/051415/what-difference-between-macaulay-duration-and-modified-duration.asp