What they are measuring here is way too specific. "Opening weekend box office" didn't really exist before the 1980s, when multiplexes became a thing. Gone With The Wind rolled out town by town over months, and since there was no home video, it was re-released every few years. Now, the opening weekend sets a film's arc for whatever success that follows, including global box office and home video sales, because internet headlines have replaced word-of-mouth advertising.
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