When the first Planetary Calendar was introduced in 1949 wall calendars, like homes, were much smaller. We added this larger version basically because Ralph has large hands and he likes to write notes on the calendar. That is also the reason we continue to print on uncoated paper, easier note writing. Apparently other people like having a little more note space too so this version continues to grow in popularity.
(for more note space see the book bound Day Planner below)