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The reason, as you guessed, is marketing. One word that sums up something memorable about a movie is a mental handle, it can appear in far larger type on a billboard, it eats up only 1 second in a ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/48547 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/48547 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/
#2: Initial revision
The reason, as you guessed, is marketing. One word that sums up _something_ memorable about a movie is a mental handle, it can appear in far larger type on a billboard, it eats up only 1 second in a 15 second commercial, it is very easy for people to recognize and associate a single word; psychologically that happens faster. If I say "Avatar" you know exactly what I'm talking about. Same with "Rocky". Even for a bomb, "WaterWorld" remains a memorable title. Short is better, even if it isn't ONE word: "Mad Max". "The Terminator". It works on TV too; "Sherlock", "Monk", "CSI", "NCIS". Its about time (to say it) and space (to print it), and being a single word it is hard to get wrong when Googling it. I understand the urge to make the title descriptive, but it can also just be a unique, recognizable label with connections to the story in someway, to make marketing more effective.