Although I understand what group rate means, I am not sure I understand Merriam Webster's definition which says:
a uniform rate charged to or from any one of a group or block of points within a given territory — called also blanket rate, block rate
My understanding of the phrase is simply a discounted rate for a group of people compared to an individual rate. So why does Merriam Webster say "or from any one of a group"? How can it be money charged from a member of a group?
Also what does a block of points within a given territory mean in this context? How is that relevant to the phrase?