install vs mkdir

I'm sitting here late at night, reading linux from scratch, and I come to this part:

http://lfs.osuosl.org/lfs/view/stable/chapter06/creatingdirs.html

my question to you, the all knowing unix.com'ers is this: what's the difference between using the install command as they do, and using the appropriate mkdir, chmod, & chown commands?

thmnetowrk:
I can't be for shure but it looks like it is their prefered way of creating directories. I could be wrong. Try a man(1) install and a man(1) mkdir.
I noticed that with mkdir you can create many directories but the default is to place them in the current directory, which is the same as using install. Futher proof to me that it might be just their prefered way of creating mass directories.

HTH
-Adam