Originally posted by tokyoaces
It is most definitely correct and supported by decades of literature and a culture of poker that predates the internet and online poker. You can find such a definition in modern books by Ed Miller, David Sklansky, and Dan Harrington.
On Ed Miller's blog someone asked:
"Ed,
could you please clarify the discrepancy between the stack size measurements in GSIHE vs. those listed in PNL v1. Do you prefer to use the newer stack size measurements as they are listed in PNL?
GSIHE:
25BB or less is a small stack
25-100BB is a medium stack
100BB or more is a big stack
PNL:
40BB or less is a short stack
200BB or more is a deep stack
in between (100BB) is a medium stack"
Ed Miller's answer was:
"Well, I think it's largely irrelevant whether you declare that "medium" stacks begin at 25BB or 40BB. You can use either metric you choose.
What's not irrelevant is to understand that strategies change significantly as the stack size increases from 25BB to 40BB. A 40BB stack is more postflop focused than a 25BB stack."