Why are 1937 BoC issue wider

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Would someone mind giving me a brief history of the reason for the size reduction between '37 & '54 ? Curious...

Received a '37 and DF $1's UNC from Don Olmstead today to give to my little niece ! Nice notes Don, thanks.

Doug
p.s. This little angel has become quite skilled at differentiating between different denominations in her collection  

they used money clips in the earlier time period and bill folds which are bigger then the wallet invented to fit in todays pant pockets

I read somewhere that the size of notes were reduced from the 1923-sized ones to the current size to save money on the paper, follwoing the US's lead in reducing the costs of production.

Below is a quote from the currency museum.


http://www.currencymuseum.ca/eng/cyp/grocery_2.php

"As a cost-saving measure, the size of chartered bank and government notes was reduced in the mid-30s. This action followed a similar one taken in the United States in 1928. "

I think Doug's original question was about the difference between the size of 1937 notes and 1954 notes.
According to the catalogue (pg 232 & 247) the 1937 series measured 6" x 2 7/8" while the 1954 series measured 6" x 2 3/4".  Is there a known reason for this change?