Not So Sure...
Seems to be pretty arbitrary split. 1952 is in a league of its own among Topps sets.
1953, 54 and 55 had smaller print runs than the 1956 set did. With Bowman out of the way, Topps really let the presses run for 1956 on all series. They are much more plentiful than any previous sets. As a result, high grade commons sell for significantly less than 1955 commons from my experience.
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